JP2008180931A - projector - Google Patents

Abstract

A projector capable of effectively using light shielded by a light shielding member.
An illumination device having a light source device that emits an illumination light beam toward an illuminated area, liquid crystal devices that modulate the illumination light beam from the illumination device according to image information, and a liquid crystal device. A projection optical system 600 that projects light modulated by 400R, 400G, and 400B; a light shielding member 700 that is disposed between the first lens array 120 and the second lens array 130 and partially shields the illumination light beam; A projector 1000 including a control unit 800 that adjusts the amount of light passing through the illumination light beam by controlling the shielding state of the light shielding member 700. The light shielding member 700 has a solar cell 706.
[Selection] Figure 1

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, a projector including a light shielding member that partially shields an illumination light beam from a light source device is known (see, for example, Patent Document 1).
According to the conventional projector, the amount of light of the illumination light beam can be adjusted by partially shielding the illumination light beam from the light source device with the light shielding member. Therefore, illumination is performed according to the content to be displayed and the usage environment of the projector. By appropriately adjusting the light amount of the light beam, it is possible to improve the contrast characteristics and gradation characteristics of the projected image.

JP 2006-106691 A

  However, in the conventional projector, the light shielded by the light shielding member is thrown away without being used, and no attempt has been made to effectively use such light.

  Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide a projector capable of effectively using light shielded by a light shielding member.

  The projector of the present invention includes an illuminating device having a light source device that emits an illuminating light beam toward the illuminated region, an electro-optic modulator that modulates the illuminating light beam from the illuminating device according to image information, and the electro-optic modulator. A projection optical system that projects light modulated by the light source, a light shielding member that is disposed in an optical path from the light source device to the electro-optic modulation device or in the projection optical system, and that partially shields an illumination light beam, A control unit that adjusts the amount of light passing through the illumination light beam by controlling the shielding state of the light shielding member, and the light shielding member includes a solar cell.

  For this reason, according to the projector of the present invention, since the light shielding member has the solar cell, it is possible to convert the light energy of the light shielded by the light shielding member into electric energy. That is, according to the projector of the present invention, the light shielded by the light shielding member can be effectively used as electric energy.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a fan that cools the light shielding member, and the control unit further has a function of supplying electric power generated by the solar battery to the fan.

  With this configuration, it is possible to effectively use light energy that has not been used conventionally as electrical energy for driving the fan. Moreover, it becomes possible to suppress an excessive temperature rise of the light shielding member by driving the fan.

  In the projector according to the aspect of the invention, it is preferable that the control unit further has a function of controlling the rotation speed of the fan based on the amount of illumination light beam shielded by the light shielding member.

  By the way, when the number of rotations of the fan is small even though the amount of illumination light beam shielded by the light shielding member is relatively large (the amount of illumination light beam passing through the light shielding member is relatively small), the light shielding member is in a high temperature state. As a result, the light shielding member may deteriorate. On the contrary, the fan rotation speed is larger than necessary even though the light quantity of the illumination light beam shielded by the light shielding member is relatively small (the illumination light flux passing through the light shielding member is relatively large). This is not preferable because electric energy is wasted. Further, since the fan noise increases in proportion to the increase in the fan speed, it is not preferable to increase the fan speed even though it is not necessary.

  In contrast, according to the projector of the present invention, the control unit has a function of controlling the number of rotations of the fan based on the amount of illumination light beam shielded by the light shielding member. It becomes possible to suppress the deterioration of the light shielding member due to heat. Further, since the fan is not rotated more than necessary, wasteful consumption of electric energy can be suppressed, and the noise of the fan can be reduced.

  In the projector according to the aspect of the invention, the projector may further include a temperature detection unit that detects a temperature of the light shielding member, and the control unit may control the rotation speed of the fan based on the temperature information of the light shielding member detected by the temperature detection unit. It is preferable to further have a function of controlling.

  By the way, when the rotation speed of the fan is small even though the temperature of the light shielding member is relatively high, the light shielding member may be in a high temperature state, and as a result, the light shielding member may be deteriorated. On the other hand, it is not preferable that the fan rotation speed is large even though the temperature of the light shielding member is relatively low, because it consumes electric energy wastefully because the fan rotates more than necessary. Further, since the fan noise increases in proportion to the increase in the fan speed, it is not preferable to increase the fan speed even though it is not necessary.

  On the other hand, according to the projector of the present invention, the control unit has a function of controlling the number of rotations of the fan based on the temperature information of the light shielding member detected by the temperature detection unit, and accordingly, according to the temperature state of the light shielding member. This makes it possible to control the rotational speed of the fan. For this reason, it becomes possible to suppress that a light shielding member will be in a high temperature state, and it becomes possible to suppress that a light shielding member deteriorates with a heat | fever. Further, since the fan is not rotated more than necessary, wasteful consumption of electric energy can be suppressed, and the noise of the fan can be reduced.

  In the projector according to the aspect of the invention, the illumination device corresponds to the first lens array having a plurality of first small lenses that divide the illumination light beam from the light source device into a plurality of partial light beams, and the plurality of first small lenses. A second lens array having a plurality of second small lenses, and a superimposing lens for superimposing the partial light beams from the second lens array on the illuminated area, wherein the light shielding member includes the first lens. A plurality of light shielding plates that are disposed opposite to each other with an illumination light beam interposed between the array and the second lens array, and the control unit functions to control a rotation state of the plurality of light shielding plates. It is preferable that the plurality of light shielding plates have solar cells.

  In the projector according to the aspect of the invention, the illumination device corresponds to the first lens array having a plurality of first small lenses that divide the illumination light beam from the light source device into a plurality of partial light beams, and the plurality of first small lenses. A second lens array having a plurality of second small lenses, and a superimposing lens for superimposing the partial light beams from the second lens array on the illuminated area, wherein the light shielding member includes the first lens. A plurality of light-shielding plates that are arranged opposite to each other with an illumination light beam sandwiched between the array and the second lens array and are movable in a virtual plane perpendicular to the illumination optical axis, It is also preferable to have a function of controlling the movement state of the plurality of light shielding plates, and the plurality of light shielding plates include solar cells.

  In the projector according to the aspect of the invention, the illumination device corresponds to the first lens array having a plurality of first small lenses that divide the illumination light beam from the light source device into a plurality of partial light beams, and the plurality of first small lenses. A second lens array having a plurality of second small lenses, and a superimposing lens for superimposing each partial light beam from the second lens array on the illuminated area, wherein the light shielding member includes the light source device and A plurality of light shielding plates arranged opposite to each other with an illumination light beam sandwiched between the first lens array and configured to be movable in a virtual plane perpendicular to the illumination optical axis, and the control unit includes the plurality of light shielding plates It is also preferable to have a function of controlling the movement state of the light shielding plate, and the plurality of light shielding plates include solar cells.

  In a projector using a plurality of light shielding plates having the above-described configuration as a light shielding member, since the plurality of light shielding plates have solar cells, it is possible to convert light energy shielded by the plurality of light shielding plates into electrical energy. It becomes. In other words, in any projector using a plurality of light shielding plates having the above-described configuration, light shielded by the plurality of light shielding plates can be effectively used as electric energy.

  In the projector according to the aspect of the invention, it is preferable that the projector is a battery-driven projector.

  The battery-driven projector has an advantage that a power outlet is not required as compared with the AC-driven projector, but has a disadvantage that the continuous use time is not so long due to the battery capacity. However, according to the projector of the present invention, it is possible to effectively use the light shielded by the light shielding member as electric energy, so that the continuous use time of the projector can be extended.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a secondary battery that stores electric power generated by the solar battery.

By the way, the electric power converted from the light shielded by the light shielding member has a drawback that the voltage fluctuation is large. However, since the power converted from the light shielded by the light shielding member can be stored once in the secondary battery by using the configuration as described above, the power with small voltage fluctuation should be used. Is possible.
When the projector is a battery-powered projector, it is possible to extend the battery life by configuring as described above, and to further increase the continuous use time of the projector.

  The projector of the present invention will be described below based on the embodiments shown in the drawings.

[Embodiment 1]
1 and 2 are diagrams for explaining a projector 1000 according to the first embodiment. 1A is a view of the optical system of the projector 1000 as viewed from above, FIG. 1B is a view of the optical system of the projector 1000 as viewed from the side, and FIG. It is a perspective view.

  In the following description, three directions orthogonal to each other are defined as the z-axis direction (the illumination optical axis OC direction in FIG. 1A) and the x-axis direction (parallel to the paper surface in FIG. And a direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis.

  As shown in FIGS. 1 and 2, the projector 1000 according to the first embodiment illuminates the illumination device 100 and the illumination light flux from the illumination device 100 by separating it into three color lights of red light, green light, and blue light. A color separation light guide optical system 200 that guides light to a region, and three liquid crystal devices 400R as electro-optic modulation devices that modulate each of the three color lights separated by the color separation light guide optical system 200 according to image information, 400G, 400B, a cross dichroic prism 500 that combines color lights modulated by the three liquid crystal devices 400R, 400G, 400B, and a projection optical system that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. 600, the light shielding member 700 disposed inside the lighting device 100, and the shielding state of the light shielding member 700. The control unit 800 that adjusts the amount of light passing through the illumination light beam, the rotation angle detection unit 810 that detects the rotation angle of the light shielding plate 702, which will be described later, the fan 820 that cools the light shielding member 700, and the secondary battery 830. It is a projector provided. The projector 1000 according to the first embodiment is an AC drive type projector.

  The illuminating device 100 includes a light source device 110 that emits an illuminating light beam toward the illuminated region side, and a plurality of first small lenses 122 (not shown) for dividing the illuminating light beam emitted from the light source device 110 into a plurality of partial light beams. .), A second lens array 130 having a plurality of second small lenses 132 (not shown) corresponding to the plurality of first small lenses 122 of the first lens array 120, The polarization conversion element 140 that converts each partial light beam from the two-lens array 130 into substantially one type of linearly polarized light having the same polarization direction and emits it, and each partial light beam emitted from the polarization conversion element 140 in the illuminated region. And a superimposing lens 150 for superimposing.

  The light source device 110 includes an ellipsoidal reflector 114, an arc tube 112 having a light emission center near the first focal point of the ellipsoidal reflector 114, and light emitted from the arc tube 112 toward the illuminated region side to the arc tube 112. It has a secondary mirror 116 that reflects toward the head and a concave lens 118 that emits the converged light from the ellipsoidal reflector 114 as substantially parallel light. The light source device 110 emits a light beam having the illumination optical axis OC as a central axis.

  The arc tube 112 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion. The tube portion is made of quartz glass formed in a spherical shape, and includes a pair of electrodes disposed in the tube portion, mercury, a rare gas, and a small amount of halogen sealed in the tube portion. As the arc tube 112, various arc tubes can be employed, for example, a metal halide lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, or the like.

  The ellipsoidal reflector 114 includes a cylindrical neck that is inserted and fixed to one sealing portion of the arc tube 112, and a reflective concave surface that reflects light emitted from the arc tube 112 toward the second focal position. Have

  The secondary mirror 116 is a reflecting means that covers substantially half of the bulb portion of the arc tube 112 and is disposed to face the reflective concave surface of the elliptical reflector 114. The sub mirror 116 is inserted and fixed to the other sealing portion of the arc tube 112. The secondary mirror 116 returns the light emitted from the arc tube 112 that does not go to the ellipsoidal reflector 114 to the arctube reflector 114 and makes it incident on the ellipsoidal reflector 114.

  The concave lens 118 is disposed on the illuminated area side of the ellipsoidal reflector 114. Then, the light from the ellipsoidal reflector 114 is emitted toward the first lens array 120.

  The first lens array 120 has a function as a light beam splitting optical element that splits light from the concave lens 118 into a plurality of partial light beams, and a plurality of first small lenses 122 are arranged in a plane orthogonal to the illumination optical axis OC. It has a configuration arranged in a matrix of rows and columns. Although not illustrated, the outer shape of the first small lens 122 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B.

  The second lens array 130 has a function of forming an image of each first small lens 122 of the first lens array 120 in the vicinity of the image forming area of the liquid crystal devices 400R, 400G, and 400B together with the superimposing lens 150. The second lens array 130 has substantially the same configuration as the first lens array 120, and a plurality of second small lenses 132 are arranged in a matrix of a plurality of rows and a plurality of columns in a plane orthogonal to the illumination optical axis OC. Have a configuration.

The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion element 140 transmits light having one polarization component (for example, P polarization component) out of the illumination light beam from the light source device 110 and light having the other polarization component (for example, S polarization component) to the illumination optical axis OC. A polarization separation layer that reflects in the vertical direction, a reflection layer that reflects light having the other polarization component reflected by the polarization separation layer in a direction parallel to the illumination optical axis OC, and one polarization that has passed through the polarization separation layer And a phase difference plate that converts light having a component into light having the other polarization component.

  The superimposing lens 150 condenses a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion element 140, and superimposes them on the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. The superimposing lens 150 is arranged so that the optical axis of the superimposing lens 150 and the illumination optical axis OC of the illumination device 100 substantially coincide. The superimposing lens 150 may be composed of a compound lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light beam emitted from the superimposing lens 150 into three color lights of red light, green light, and blue light, and each of the three color liquid crystal devices 400R to be illuminated. , 400G, 400B.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the illumination light beam according to the image information and are the illumination target of the illumination device 100.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, an incident light that will be described later is used according to given image information using a polysilicon TFT as a switching element. Modulates the polarization direction of one type of linearly polarized light emitted from the side polarizing plate.

  Condensing lenses 300R, 300G, and 300B are disposed in the front stage of the optical path of the liquid crystal devices 400R, 400G, and 400B.

  Although not shown here, incident-side polarizing plates are interposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, and the liquid crystal devices 400R, 400G, and 400B are disposed. Between the 400B and the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the exit side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on the substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form a large screen image on the screen SCR.

  As shown in FIG. 1, the light shielding member 700 is disposed so as to be opposed to each other with the illumination light beam sandwiched between the first lens array 120 and the second lens array 130, and is capable of rotating two light shielding plates 702 and 702. Two rotating devices 704 and 704 that respectively rotate the two light shielding plates 702 and 702, and solar cells 706 and 706 disposed on one surface of the light shielding plate 702, respectively.

  As shown in FIG. 1C, the light shielding plate 702 is a plate-like member and has a function of partially shielding the illumination light beam. The light shielding plate 702 is, for example, a metal plate made of an aluminum alloy. The light shielding plate 702 has a rotation end located on the first lens array 120 side and a rotation center located on the second lens array 130 side. Note that it is preferable to configure the rotation mechanism of the light shielding plate 702 so that the light shielding plate 702 is positioned closer to the second lens array 130 than the first lens array 120 when shielding light most.

  Although not shown here, the surfaces of the light shielding plate 702 where the solar cells 706 are not disposed (surfaces opposite to the surfaces of the light shielding plate 702 irradiated with the illumination light beam) are formed in parallel to each other. A heat dissipating portion comprising a plurality of uneven grooves is formed. Thereby, the heat generated when the illumination light beam is shielded can be quickly released. Moreover, since the heat radiating portion is formed of a plurality of concave and convex grooves that are parallel to each other, the structure of the heat radiating portion can be simplified.

  The light shielding plate 702 is connected to the motor shaft of the rotation device 704, and is configured to perform a rotation operation for adjusting the amount of illumination light flux by driving the rotation device 704.

  The rotation device 704 has a stepping motor. The stepping motor is configured to rotate by a certain angle each time a pulse signal is input. A motor other than the stepping motor may be used. For example, by using an ultrasonic motor, the light shielding plate 702 can be rotated at high speed.

  The solar cell 706 is disposed on the surface of the light shielding plate 702 that is irradiated with the illumination light beam. As the solar cell 706, a silicon solar cell (single crystal silicon type, polycrystalline silicon type, amorphous silicon type, etc.), a compound solar cell (GaAs type, CIS type (chalcopyrite type), etc.), an organic type solar cell, etc. A solar cell etc. can be used conveniently.

  The control unit 800 (see FIG. 2) controls the rotation state of the light shielding plate 702 to adjust the amount of light passing through the illumination light beam (shielding state control function), and the illumination light beam shielded by the light shielding plate 702. It has a function of controlling the rotational speed of the fan 820 based on the amount of light (fan control function), and a function of supplying power generated by the solar cell 706 to the fan 820 (power supply function).

  The rotation angle detection unit 810 has a function of detecting the rotation angle of the light shielding plate 702. Information regarding the rotation angle of the light shielding plate 702 detected by the rotation angle detection unit 810 is output to the control unit 800. The control unit 800 controls the rotation speed of the fan 820 based on the output information from the rotation angle detection unit 810.

  The fan 820 is a sirocco fan, for example. Air taken in from the outside of the projector 1000 passes through the light shielding member 700 (such as the light shielding plate 702 and the rotating device 704) by the fan 820 and the cooling air flow path, and then is discharged to the outside. The fan 820 may be a fan that cools only the light shielding member 700 (dedicated fan), or may be a fan that cools other devices in addition to the light shielding member 700 (common fan).

  The secondary battery 830 has a function of storing power generated by the solar battery 706. As the secondary battery 830, various known secondary batteries can be used. For example, a nickel-cadmium battery can be preferably used.

  According to the projector 1000 according to the first embodiment configured as described above, since the light shielding member 700 includes the solar cell 706, the light energy of the light shielded by the light shielding plate 702 can be converted into electrical energy. Become. That is, according to the projector 1000 according to the first embodiment, the light shielded by the light shielding plate 702 can be effectively used as electric energy.

  The projector 1000 according to the first embodiment further includes a fan 820 that cools the light shielding member 700, and the control unit 800 has a function of supplying power generated by the solar battery 706 to the fan 820, and thus is conventionally used. It is possible to effectively use the light energy that has not occurred as electric energy for driving the fan. Further, by driving the fan 820, an excessive temperature rise of the light shielding member 700 can be suppressed.

  By the way, when the rotational speed of the fan 820 is small even though the light amount of the illumination light beam shielded by the light shielding plate 702 is relatively large (the light amount of the illumination light beam passing through the light shielding member 700 is relatively small), the light shielding member 700 becomes a high temperature state, and as a result, the light shielding member 700 may deteriorate. On the contrary, it is necessary that the number of rotations of the fan 820 be large even though the amount of illumination light beam shielded by the light shielding plate 702 is relatively small (the amount of illumination light beam passing through the light shielding member 700 is relatively large). Since the fan 820 is rotated as described above, electric energy is wasted, which is not preferable. Further, since the noise of the fan 820 increases in proportion to the increase in the number of rotations of the fan 820, it is not preferable to increase the number of rotations of the fan 820 even if not necessary.

  On the other hand, according to the projector 1000 according to the first embodiment, the control unit 800 has a function of controlling the rotation speed of the fan 820 based on the amount of illumination light beam shielded by the light shielding plate 702. It is possible to prevent the light shielding member 700 from being deteriorated due to heat. Further, since the fan 820 is not rotated more than necessary, wasteful consumption of electrical energy can be suppressed, and the noise of the fan 820 can be reduced.

[Embodiment 2]
FIG. 3 is a diagram for explaining a projector 1002 according to the second embodiment. In FIG. 3, the same members as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1002 according to the second embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment, but includes a temperature detection unit instead of the rotation angle detection unit described in the first embodiment. This is different from the projector 1000 according to the first embodiment.

  That is, the projector 1002 according to the second embodiment includes a temperature detection unit 812 that detects the temperature of the light shielding member 700, as shown in FIG.

  In addition, the projector 1002 according to the second embodiment includes a control unit 802 instead of the control unit 800 described in the first embodiment in association with the temperature detection unit 812 instead of the rotation angle detection unit 810.

  The control unit 802 basically has the same function as the function of the control unit 800 described in the first embodiment, but based on the temperature information of the light shielding member 700 detected by the temperature detection unit 812 as a fan control function. And has a function of controlling the rotational speed of the fan 820.

  As described above, the projector 1002 according to the second embodiment differs from the projector 1000 according to the first embodiment in that the projector 1002 according to the first embodiment includes a temperature detection unit instead of the rotation angle detection unit. Similarly to the above, since the light shielding member 700 includes the solar cell 706, the light energy of the light shielded by the light shielding plate 702 can be converted into electric energy. That is, according to the projector 1002 according to the second embodiment, the light shielded by the light shielding plate 702 can be effectively used as electric energy.

  The projector 1002 according to the second embodiment has the same configuration as the projector 1000 according to the first embodiment except that the projector 1002 includes a temperature detection unit instead of the rotation angle detection unit, and thus the projector 1000 according to the first embodiment. Among the effects possessed, the corresponding effect is maintained as it is.

[Embodiment 3]
FIG. 4 is a diagram for explaining a projector 1004 according to the third embodiment. 4A is a view of the optical system of the projector 1004 as viewed from above, FIG. 4B is a view of the optical system of the projector 1004 as viewed from the side, and FIG. FIG. 4D is a rear view of the light shielding member 710. FIG.
In FIG. 4, the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1004 according to the third embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment, but the configuration of the light shielding member is different from that of the projector 1000 according to the first embodiment.

  That is, in the projector 1004 according to the third embodiment, as illustrated in FIG. 4, the light shielding member is disposed so as to face the illumination light beam between the first lens array 120 and the second lens array 130, and the illumination optical axis. A light shielding member 710 having two light shielding plates 714 and 714 each configured to be movable in a virtual plane perpendicular to the OC is used.

  As shown in FIG. 4, the light shielding member 710 is movable in a virtual plane perpendicular to the illumination optical axis OC and disposed opposite to the plate-like member 712 having an opening at the center, with the illumination light beam interposed therebetween. The pair of light shielding plates 714 and 714 configured, the light shielding plate driving mechanism 716 for moving the pair of light shielding plates 714 and 714 up and down, and the surfaces of the pair of light shielding plates 714 and 714 that are irradiated with illumination light beams are respectively arranged. Solar cells 718, 718. The light shielding member 710 is disposed between the first lens array 120 and the second lens array 130.

  For the plate-like member 712, for example, a metal made of an aluminum alloy can be suitably used. The planar shape of the opening of the plate-like member 712 is substantially the same as the planar shape of the first lens array 120 and the second lens array 130.

  The light shielding member driving mechanism 716 has a function of moving the pair of light shielding plates 714 and 714 up and down in synchronization. The light shielding plate driving mechanism 716 is provided with a motor (not shown).

  The projector 1004 according to the third embodiment includes a control unit 804 (not shown) instead of the control unit 800 described in the first embodiment because the configuration of the light shielding member is different.

  The control unit 804 basically has the same function as that of the control unit 800 described in the first embodiment, but has a function of controlling the movement state of the pair of light shielding plates 714 and 714 as a shielding state control function. Have.

  As described above, the projector 1004 according to the third embodiment is different from the projector 1000 according to the first embodiment in the configuration of the light shielding member. However, similarly to the projector 1000 according to the first embodiment, the light shielding member 710 is a solar cell. Accordingly, the light energy of the light shielded by the light shielding plate 714 can be converted into electric energy. That is, according to the projector 1004 according to the third embodiment, the light shielded by the light shielding plate 714 can be effectively used as electric energy.

  The projector 1004 according to the third embodiment has the same configuration as that of the projector 1000 according to the first embodiment except that the configuration of the light shielding member is different. Has the effect as it is.

[Embodiment 4]
FIG. 5 is a diagram for explaining a projector 1006 according to the fourth embodiment. 5A is a view of the optical system of the projector 1006 as viewed from above, FIG. 5B is a view of the optical system of the projector 1006 as viewed from the side, and FIG. FIG. 5D is a rear view of the light shielding member 720. FIG.
In FIG. 5, the same members as those in FIGS. 1 and 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1006 according to the fourth embodiment basically has a configuration similar to that of the projector 1004 according to the third embodiment, but the arrangement position of the light shielding member is different from that of the projector 1004 according to the third embodiment.

That is, in the projector 1006 according to the fourth embodiment, as illustrated in FIG. 5, the light shielding member 720 is disposed between the light source device 110 and the first lens array 120.
Note that the light shielding member 720 in the projector 1006 according to the fourth embodiment has the same configuration as the light shielding member 710 in the projector 1004 according to the third embodiment, as illustrated in FIGS. 5C and 5D. Detailed description is omitted.

  As described above, the projector 1006 according to the fourth embodiment is different from the projector 1004 according to the third embodiment in the arrangement position of the light shielding member, but is similar to the projectors 1000 and 1004 according to the first and third embodiments. Since the member 720 includes the solar battery 728, the light energy of the light shielded by the light shielding plate 724 can be converted into electric energy. That is, according to the projector 1006 according to the fourth embodiment, the light shielded by the light shielding plate 724 can be effectively used as electric energy.

  Since the projector 1006 according to the fourth embodiment has the same configuration as that of the projector 1004 according to the third embodiment except that the arrangement positions of the light shielding members are different, the projectors 1000 and 1004 according to the first and third embodiments have the same configuration. It has the corresponding effect as it is.

[Embodiment 5]
FIG. 6 is a diagram for explaining a projector 1008 according to the fifth embodiment. 6A is a view of the optical system of the projector 1008 as viewed from above, FIG. 6B is a view of the optical system of the projector 1008 as viewed from the side, and FIG. FIG. 6D is a front view of the light shielding member 730. FIG.
In FIG. 6, the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1008 according to the fifth embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment, but the configuration and arrangement position of the light shielding member are different from those of the projector 1000 according to the first embodiment.

  That is, in the projector 1008 according to the fifth embodiment, as illustrated in FIG. 6, the light shielding member is disposed on the light incident side of the polarization conversion element 140 and can be moved in a virtual plane perpendicular to the illumination optical axis OC. A light shielding member 730 having two light shielding plates 732 and 732 is used.

  As shown in FIG. 6, the light shielding member 730 includes two light shielding plates 732 and 732 configured to be movable in a virtual plane perpendicular to the illumination optical axis OC, and a holding member that holds the two light shielding plates 732 and 732. 738, two motors 742 and 742 for moving the two light shielding plates 732 and 732, respectively, and solar cells 746 and 746 arranged on the surfaces of the two light shielding plates 732 and 732 irradiated with the illumination light beam, respectively. Have The light shielding member 730 is disposed on the light incident side of the polarization conversion element 140.

  The light shielding plate 732 is a plate-like member having a substantially rectangular shape in plan view, and an opening 734 is formed at a position corresponding to the polarization separation layer 142 of the polarization conversion element 140 (FIGS. 6C and 6D). )reference.). The light shielding plate 732 is, for example, a metal plate made of an aluminum alloy.

  An engaging portion 736 that engages with a gear portion 744 formed on the motor shaft of the motor 742 is formed at the lower end portion of the light shielding plate 732. Thereby, the drive of the motor 742 can be transmitted to the light shielding plate 732 via the engaging portion 736.

  A slide portion (not shown) is provided on the upper portion of the holding member 738, and the upper end portion of the light shielding plate 732 is engaged with the slide portion. Accordingly, the light shielding plate 732 can move along the slide portion of the holding member 738, that is, along the x-axis direction.

  As the motor 742, for example, a galvano motor (a motor used for a galvano mirror or a galvano scanner) can be used. A motor other than the galvano motor may be used. For example, by using an ultrasonic motor, acceleration and deceleration during movement of the light shielding plate 732 can be performed at high speed. Further, it is not necessary to use two motors, and it is possible to move the two light shielding plates 732 and 732 using one motor. In this case, it is preferable to use a known drive transmission means for transmitting the drive of the motor 742 to the two light shielding plates 732 and 732.

  Note that means for moving the light shielding plate 732 along the x-axis direction is not limited to the above-described configuration, and other known means may be used.

  The projector 1008 according to the fifth embodiment includes a control unit 806 (not shown) instead of the control unit 800 described in the first embodiment because the configuration and arrangement position of the light shielding members are different.

  The control unit 806 has basically the same function as that of the control unit 800 described in the first embodiment, but has a function of controlling the movement state of the two light shielding plates 7324 and 732 as a shielding state control function. Have.

  As described above, the projector 1008 according to the fifth embodiment differs from the projector 1000 according to the first embodiment in the configuration and the arrangement position of the light shielding member, but as in the case of the projector 1000 according to the first embodiment, the light shielding member 730. Since it has the solar cell 746, it becomes possible to convert the light energy of the light shielded by the light shielding plate 732 into electric energy. That is, according to the projector 1008 according to the fifth embodiment, the light shielded by the light shielding plate 732 can be effectively used as electric energy.

  The projector 1008 according to the fifth embodiment has the same configuration as that of the projector 1000 according to the first embodiment except that the configuration and arrangement position of the light shielding member are different. Of which, it has the relevant effect.

[Embodiment 6]
FIG. 7 is a diagram for explaining a projector 1010 according to the sixth embodiment. 7A is a view of the optical system of the projector 1010 as viewed from above, FIG. 7B is a view of the light shielding member 750 and the projection optical system 600 as viewed from above, and FIG. 7 is a front view of a member 750. FIG.
In FIG. 7A, the same members as those in FIG. 1A are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1010 according to the sixth embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment, but the configuration and arrangement position of the light shielding member are different from those of the projector 1000 according to the first embodiment.

  That is, in the projector 1010 according to the sixth embodiment, as illustrated in FIG. 7, as the light shielding member, the light shielding member 750 that is disposed inside the projection optical system 600 and configured to reduce the amount of illumination light flux is used. Yes.

  As shown in FIG. 7, the light shielding member 750 is disposed on each of the plurality of diaphragm blades 752, the holding frame 754 that holds the plurality of diaphragm blades 752, and the surface that is irradiated with the illumination light beam in the plurality of diaphragm blades 752. A solar cell 756. The light shielding member 750 is disposed between the lens 606 and the lens 608 constituting the projection optical system 600.

  As shown in FIG. 7B, the projection optical system 600 includes five lenses 602 to 610 and a lens barrel 612. The five lenses 602 to 610 are arranged in parallel in the optical axis direction, and are disposed in the lens barrel 612 via a lens frame (not shown). The lens barrel 612 is attached to the front surface of the housing of the projector 1010.

  The projector 1010 according to the sixth embodiment includes a control unit 808 (not shown) instead of the control unit 800 described in the first embodiment because the configuration and arrangement position of the light shielding members are different.

  The control unit 808 basically has the same function as that of the control unit 800 described in the first embodiment, but has a function of controlling the aperture state of the light shielding member 750 as a shielding state control function.

  As described above, the projector 1010 according to the sixth embodiment differs from the projector 1000 according to the first embodiment in the configuration and the arrangement position of the light shielding member, but as in the case of the projector 1000 according to the first embodiment, the light shielding member 750. Since the solar cell 756 has the solar cell 756, the light energy of the light shielded by the light shielding member 750 can be converted into electric energy. That is, according to the projector 1010 according to the sixth embodiment, it is possible to effectively use the light shielded by the light shielding member 750 as electric energy.

  The projector 1010 according to the sixth embodiment has the same configuration as the projector 1000 according to the first embodiment except that the configuration and arrangement position of the light shielding member are different. Therefore, the effect of the projector 1000 according to the first embodiment is obtained. Of which, it has the relevant effect.

  In the projector 1010 according to the sixth embodiment, since the light shielding member 750 is disposed in the vicinity of the position where the secondary light source image is formed in the projection optical system 600, the projected image is formed on the screen SCR surface that is the imaging surface. This works as an aperture stop that can uniformly reduce the amount of light over the entire surface. For this reason, there is also an effect that the light quantity of the illumination light beam can be adjusted while suppressing the occurrence of flare and luminance unevenness in the projected image.

  Note that a zoom lens may be employed in the projection optical system 600. In this case, the position at which the secondary light source image is formed in the projection optical system will move, but the flare in the projection image will be changed. The light-shielding member 750 may be disposed in the vicinity of the position where the secondary light source image is formed within a range in which the amount of illumination light beam can be adjusted while suppressing the occurrence of non-uniformity and uneven brightness.

  The projector of the present invention has been described based on each of the above embodiments. However, the present invention is not limited to each of the above embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

(1) The projectors 1000 to 1010 according to the above embodiments are AC-driven projectors, but the present invention is not limited to this, and the present invention can also be applied to battery-driven projectors. It is. The battery-driven projector has an advantage that a power outlet is not required as compared with the AC-driven projector, but has a disadvantage that the continuous use time is not so long due to the battery capacity. However, by applying the present invention to a battery-powered projector, it is possible to effectively use the light shielded by the light shielding plate as electric energy, so that the continuous use time of the projector can be extended. Become. When the projector is a battery-driven projector, the battery life can be extended by providing the secondary battery, and the continuous use time of the projector can be further increased.

(2) In projectors 1000 to 1010 according to the above embodiments, control units 800 to 808 control the number of rotations of fan 820 based on the amount of illumination light beam shielded by the light shielding member, as a fan control function. Or although it had the function which controls the rotation speed of the fan 820 based on the temperature information of the light-shielding member detected by the temperature detection part 812, this invention is not limited to this. For example, the solar battery and the fan 820 may be directly connected to drive and control the fan 820. In this case, when the amount of illumination light beam shielded by the light shielding member is large, the amount of power generation in the solar cell increases, so the number of revolutions of the fan 820 increases, and the amount of illumination light beam shielded by the light shielding member is small. Sometimes, since the amount of power generation in the solar cell is reduced, the number of rotations of the fan 820 is reduced, so that the light shielding member can be efficiently cooled.

(3) In the projectors 1000 to 1010 according to the above embodiments, the projector provided with the secondary battery has been described as an example. However, the present invention is not limited to this, and the projector does not include the secondary battery. It is also possible to apply the present invention.

(4) In projectors 1000 to 1010 according to the above-described embodiments, the case where the light shielding plate or diaphragm blade and the solar cell are configured as separate members has been described as an example, but the present invention is limited to this. The light shielding plate or diaphragm blade and the solar cell may be integrated as one unit.

(5) In the projectors 1000 to 1010 according to the above-described embodiments, the secondary mirror is used as the reflecting means disposed in the arc tube. However, the present invention is not limited to this, and the reflecting film is used as the reflecting means. It is also preferable to use. In the projectors 1000 to 1010 according to the above-described embodiments, the projector in which the secondary mirror as the reflecting means is disposed on the arc tube is described as an example. However, the present invention is not limited to this. In addition, the present invention can be applied to a projector in which a secondary mirror is not provided.

(6) In projectors 1000 to 1010 according to the above embodiments, the light source device including the ellipsoidal reflector and the concave lens is used as the light source device. However, the present invention is not limited to this, and the parabolic reflector. It is also preferable to use a light source device comprising

(7) The projectors 1000 to 1010 according to the above embodiments are transmissive projectors, but the present invention is not limited to this. The present invention can also be applied to a reflection type projector. Here, “transmission type” means that an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means, such as a reflective liquid crystal device, is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(8) In the projectors 1000 to 1010 according to the above embodiments, the projector using the three liquid crystal devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this, and The present invention can also be applied to a projector using two, four, or four or more liquid crystal devices.

(9) In projectors 1000 to 1010 according to the above-described embodiments, the liquid crystal device is used as the electro-optic modulation device, but the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(10) The present invention is applied to a rear projection projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection projector that projects from the side that observes the projected image. Is also possible.

FIG. 3 is a diagram for explaining a projector 1000 according to the first embodiment. FIG. 3 is a diagram for explaining a projector 1000 according to the first embodiment. FIG. 6 is a diagram for explaining a projector 1002 according to a second embodiment. FIG. 10 is a diagram for explaining a projector 1004 according to a third embodiment. FIG. 10 is a diagram for explaining a projector 1006 according to a fourth embodiment. FIG. 10 is a diagram for explaining a projector 1008 according to a fifth embodiment. FIG. 10 is a diagram for explaining a projector 1010 according to a sixth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Illuminating device, 110 ... Light source device, 112 ... Light-emitting tube, 114 ... Ellipsoidal reflector, 116 ... Secondary mirror, 118 ... Concave lens, 120 ... First lens array, 130 ... Second lens array, 140 ... Polarization conversion element, DESCRIPTION OF SYMBOLS 142 ... Polarization separation layer, 144 ... Reflection layer, 146 ... Phase difference plate, 150 ... Superposition lens, 200 ... Color separation light guide optical system, 210, 220 ... Dichroic mirror, 230, 240, 250 ... Reflection mirror, 260 ... Incident Side lens, 270 ... Relay lens, 300R, 300G, 300B ... Condensing lens, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection optical system, 602, 604, 606, 608, 610 ... Lens 612, barrel, 700, 710, 720, 730, 750, light shielding member, 702, 71 , 724, 732 ... light shielding plate, 704 ... rotating device, 706, 718, 728, 746, 756 ... solar cell, 712, 722 ... plate-like member, 716, 726 ... light shielding plate driving mechanism, 734 ... opening, 736 ... engaging part, 738 ... holding member, 742 ... motor, 744 ... gear part, 752 ... diaphragm blade, 754 ... holding frame, 800, 802 ... control part, 810 ... rotation angle detecting part, 812 ... temperature detecting part, 820 ... Fan, 830 ... Secondary battery, 1000, 1002, 1004, 1006, 1008, 1010 ... Projector, OC ... Illumination optical axis, SCR ... Screen

Claims (9)

An illuminating device having a light source device that emits an illuminating light beam toward the illuminated region
An electro-optic modulation device that modulates illumination light flux from the illumination device according to image information;
A projection optical system for projecting light modulated by the electro-optic modulation device;
A light shielding member that is disposed in an optical path from the light source device to the electro-optic modulation device or in the projection optical system, and partially shields an illumination light beam;
A controller that adjusts the amount of light passing through the illumination light beam by controlling the shielding state of the light shielding member,
The projector, wherein the light shielding member includes a solar cell. The projector according to claim 1, wherein
A fan for cooling the light shielding member;
The control unit further has a function of supplying electric power generated by the solar battery to the fan. The projector according to claim 2,
The projector further has a function of controlling the number of rotations of the fan based on the amount of illumination light beam shielded by the light shielding member. The projector according to claim 2,
A temperature detection unit for detecting the temperature of the light shielding member;
The projector further has a function of controlling the number of rotations of the fan based on temperature information of the light shielding member detected by the temperature detection unit. The projector according to any one of claims 1 to 4,
The illumination device includes a first lens array having a plurality of first small lenses for dividing an illumination light beam from the light source device into a plurality of partial light beams, and a plurality of second small lenses corresponding to the plurality of first small lenses. And a superimposing lens that superimposes each partial light flux from the second lens array on the illuminated area,
The light-shielding member is a plurality of light-shielding plates that are disposed opposite to each other with an illumination light beam sandwiched between the first lens array and the second lens array,
The control unit has a function of controlling a rotation state of the plurality of light shielding plates,
The projector, wherein the plurality of light shielding plates include solar cells. The projector according to any one of claims 1 to 4,
The illumination device includes a first lens array having a plurality of first small lenses for dividing an illumination light beam from the light source device into a plurality of partial light beams, and a plurality of second small lenses corresponding to the plurality of first small lenses. And a superimposing lens that superimposes each partial light flux from the second lens array on the illuminated area,
The light shielding member is disposed opposite to the illumination lens with an illumination light beam interposed between the first lens array and the second lens array, and is configured to be movable in a virtual plane perpendicular to the illumination optical axis. And
The control unit has a function of controlling the movement state of the plurality of light shielding plates,
The projector, wherein the plurality of light shielding plates include solar cells. The projector according to any one of claims 1 to 4,
The illumination device includes a first lens array having a plurality of first small lenses for dividing an illumination light beam from the light source device into a plurality of partial light beams, and a plurality of second small lenses corresponding to the plurality of first small lenses. And a superimposing lens that superimposes each partial light flux from the second lens array on the illuminated area,
The light-shielding member is a plurality of light-shielding plates that are arranged to face each other with an illumination light beam sandwiched between the light source device and the first lens array, and are respectively movable in a virtual plane perpendicular to the illumination optical axis. ,
The control unit has a function of controlling the movement state of the plurality of light shielding plates,
The projector, wherein the plurality of light shielding plates include solar cells. In the projector according to any one of claims 1 to 7,
The projector is a battery-powered projector. The projector according to any one of claims 1 to 8,
The projector further comprising a secondary battery for storing electric power generated by the solar battery.