JP2007071913A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of excellently adjusting the quantity of illuminating light by a dimmer without making the installation space of the dimmer larger. <P>SOLUTION: The projector includes the dimmer 7 arranged to be interposed between a first lens array and a second lens array 413 inside a housing for optical parts 45, and adjusting the light quantity of luminous flux emitted from the first lens array and made incident on the second lens array 413. The dimmer 7 includes a pair of shielding members arranged symmetrically with respect to an illumination optical axis, made turnable, and turning to partially intercept the luminous flux emitted from the first lens array. The pair of shielding members has a stepped shape where a light shielding area 7411 to intercept the luminous flux emitted from the first lens array is positioned on a luminous flux emitting side and a light non-shielding area 7412 not to intercept the luminous flux emitted from the first lens array is positioned on a luminous flux incident side in a state in which the shielding members turn until they intercept the luminous flux most. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector.

Conventionally, an integrator illumination optical system having a light source, a light modulation device that modulates a light beam emitted from the integrator illumination optical system according to image information to form an optical image, and a projection that enlarges and projects the formed optical image A projector including an optical device is known.
In such a projector, in order to improve the contrast of the projected image, the amount of light emitted from the light source and incident on the light modulation device may be adjusted. However, when a discharge light source such as a high-pressure mercury lamp is used as the light source, even if the light emission amount of the light source is simply reduced, the light emission amount of 100% can be reduced only to about 70%. There was a problem that the amount of light could not be reduced sufficiently.
In order to solve such a problem, a projector including an open / close light shielding member (light control device) that partially shields a light beam emitted from a light source is known (for example, see Patent Document 1).
The light control device described in Patent Document 1 is disposed between the first lens array and the second lens array. This light control device has a pair of light shielding plates in the form of a rectangular plate that is configured to be rotatable so that the tip portion is located on the second lens array side. And this light control apparatus partially shields the illumination light which goes to a 2nd lens array from a 1st lens array by rotating a pair of light shielding board.

JP 2004-264819 A

However, since the light control device described in Patent Document 1 is configured to rotate the pair of light shielding plates, the light control device prevents the light shielding plate from mechanically interfering with other members when the light shielding plate rotates. It is necessary to increase the space for installing the device.
In addition, as a light control device, a light shielding plate is provided so as to be substantially orthogonal to the light beam emitted from the light source, and the light shielding plate is slid in and out of the optical path in a state substantially orthogonal to the light beam emitted from the light source to illuminate. Even when a configuration that partially shields light is used, a space for sliding the light shielding plate out of the optical path is required, and the space for installing the light control device needs to be increased as described above. .

  The objective of this invention is providing the projector which can adjust the light quantity of illumination light favorably with a light control apparatus, without enlarging the installation space of a light control apparatus.

  The projector according to the present invention includes an integrator illumination optical system having a light source, a light modulation device that forms an optical image by modulating a light beam emitted from the integrator illumination optical system according to image information, and an enlarged projection of the optical image. A projection optical device, and an optical component housing in which an illumination optical axis is set and the integrator illumination optical system and the light modulation device are arranged at positions corresponding to the illumination optical axis, The integrator illumination optical system includes a first lens array having a plurality of lens elements that divide a light beam emitted from the light source into a plurality of partial light beams, and a plurality of lens elements corresponding to the plurality of lens elements of the first lens array. A second lens array having lens elements; and the plurality of partial light beams together with the second lens array superimposed on an image forming region of the light modulation device. And is arranged between the first lens array and the second lens array, and is emitted from the first lens array to the second lens array. A light control device that adjusts the amount of incident light beam is provided, and the light control device is arranged symmetrically with respect to the illumination optical axis, and is rotatable so that it can be rotated to rotate the light beam emitted from the first lens array. A pair of shielding members that partially shield the light beam emitted from the first lens array in a state where the shielding member is rotated until the shielding member shields the light beam most. It has a stepped shape in which a light shielding region for shielding light is positioned on the light beam emitting side, and a non-light shielding region for blocking light beams emitted from the first lens array is positioned on the light beam incident side. .

By the way, as an optical component casing, a container-shaped component storage member that stores and arranges optical components such as a first lens array, a second lens array, and a superimposing lens, and an opening portion of the component storage member are closed. A configuration including a lid member is often used. In such a configuration, the support structure of the optical component such as the first lens array, the second lens array, and the superimposing lens in the component storage member is a structure that supports a non-irradiated portion where the optical component is not irradiated with a light beam. Often used.
In the present invention, the light control device is disposed between the first lens array and the second lens array, and is a pair that can rotate and partially shields the light beam emitted from the first lens array by rotating. The shielding member is provided. The pair of shielding members have a stepped shape in which the light shielding region is located on the light beam emission side and the non-light shielding region is located on the light beam incidence side. As a result, the non-light-shielding region of the pair of shielding members does not mechanically interfere with the support structure of the second lens array in the optical component housing, and the light-shielding region of the pair of shielding members is brought close to the second lens array. Can be placed in position. In addition, even when the pair of shielding members are rotated, it is possible to realize a structure that can avoid mechanical interference between the pair of shielding members and the support structure of the second lens array in the optical component housing. .
Therefore, since a pair of shielding members can be disposed close to the second lens array and a structure that does not mechanically interfere with the support structure of the second lens array even when the pair of shielding members is rotated, a structure can be realized. The light control device can be installed in a narrow space without unnecessarily increasing the space for the light control device, and the light control device can favorably adjust the amount of illumination light.

In the projector according to the aspect of the invention, the light control device includes a rotation shaft that pivotally supports the pair of shielding members, and a driving mechanism that engages the pair of shielding members and rotates the pair of shielding members. And a fixing member that supports and integrates the pivot shaft, the pair of shielding members, and the drive mechanism, and makes the light control device detachable from the optical component casing. Is preferred.
In the present invention, the light control device includes a fixing member that supports and integrates the pair of shielding members, the rotation shaft, and the driving mechanism. That is, in the light control device, the pair of shielding members, the rotation shaft, and the drive mechanism are unitized by the fixing member. And the fixing member makes the whole light control apparatus detachable with respect to the housing | casing for optical components. As a result, for example, when the light control device is replaced due to some trouble, the light control is performed in comparison with the configuration in which the pair of shielding members, the rotation shaft, and the drive mechanism are directly supported by the optical component housing. The entire apparatus can be removed from the optical component housing, and the light control device can be easily replaced. In addition, it is not necessary to directly attach the pair of shielding members, the rotation shaft, and the drive mechanism to the optical component housing in a narrow space inside the optical component housing, and the pair of shielding members, the rotation shaft After the drive mechanism is attached to the fixing member, the light control device can be installed simply by attaching the light control device to the optical component casing, and the light control device can be easily assembled.

In the projector according to the aspect of the invention, the fixing member is attached to the optical component casing via an elastic member. When the fixing member is attached to the optical component casing, the fixing member is mechanically attached to the optical component casing by the elastic member. It is preferable to be in a non-interference state where no interference occurs.
In the present invention, the unitized light control device is attached to the optical component casing via an elastic member between the fixing member and the optical component casing. The unitized light control device is in a non-interference state (floating state) in which the elastic member does not mechanically interfere with the optical component casing. As a result, when a motor or the like is employed as the drive mechanism, vibration due to driving of the motor or the like can be absorbed by the elastic member, and transmission of the vibration to the optical component casing can be avoided. For this reason, the projection image enlarged and projected by the projection optical apparatus does not vibrate in conjunction with the vibration, and the user can view the projection image satisfactorily.

In the projector according to the aspect of the invention, it is preferable that an urging member that urges the rotation shaft with respect to the fixing member is provided at an attachment position of the rotation shaft with respect to the fixing member.
According to the present invention, since the urging member urges the rotation shaft against the fixed member, it is possible to eliminate the mounting play between the rotation shaft and the fixed member, and to rotate the pair of shielding members satisfactorily. The light quantity of illumination light can be satisfactorily adjusted by the light control device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1. (Appearance configuration)
1 and 2 are perspective views showing the external appearance of the projector 1. FIG. Specifically, FIG. 1 is a perspective view of the projector 1 as viewed from the upper front side. FIG. 2 is a perspective view of the projector 1 as viewed from the upper rear side.
The projector 1 modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the formed optical image on a screen (not shown). As shown in FIG. 1 or FIG. 2, the projector 1 includes a substantially rectangular parallelepiped outer casing 2 and a projection lens 3 as a projection optical device exposed from the outer casing 2.
The projection lens 3 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel, and enlarges and projects image light modulated according to image information by the main body of the projector 1.

The exterior housing 2 is a synthetic resin housing, and houses the main body of the projector 1. As shown in FIG. 1 or 2, the outer casing 2 includes an upper case 21 that covers the upper part of the apparatus main body, a lower case 22 that covers the lower part of the apparatus main body, and a front case 23 that covers the front part of the apparatus main body. (FIG. 1).
As shown in FIG. 1 or FIG. 2, the upper case 21 includes a top surface portion 21A and a side surface portion 21B (FIG. 1) that respectively form the top surface, a part of the side surface, a part of the back surface, and a part of the front surface of the exterior casing 2. 2), 21C (FIG. 1), back part 21D (FIG. 2), and front part 21E (FIG. 1).

As shown in FIG. 1 or FIG. 2, the top surface portion 21A has a substantially rectangular shape in plan view, is gently curved from the substantially central portion in plan view to the front side, the side surface, and the back side, and has a convex curved surface shape. Have.
In the top surface portion 21A, two openings 21A1 are formed on the front side and on the right side when viewed from the front, as shown in FIG. 1 or FIG. The two openings 21A1 expose a part of the various rotary knobs 3A for operating the projection lens 3 and adjusting the projection position of the projected image projected on the screen (not shown).
Further, in the top surface portion 21A, an operation panel 24 for performing start-up / adjustment operation of the projector 1 is provided on the rear side of the opening portion 21A1 so as to extend in the left-right direction as shown in FIG. Yes. When the operation button 241 on the operation panel 24 is appropriately pressed, a tact switch mounted on a circuit board (not shown) arranged inside the operation button 241 is brought into contact with and a desired operation can be performed. In addition, an LED (Light Emitting Diode) (not shown) is attached to the circuit board, and emits light according to a predetermined operation.
The circuit board of the operation panel 24 described above is electrically connected to a control board (not shown), and an operation signal when the operation button 241 is pressed is output to the control board.

The side portions 21B and 21C, the back surface portion 21D, and the front surface portion 21E are portions that hang substantially from the respective edges of the rectangular shape in plan view on the top surface portion 21A, as shown in FIG.
Among these, in the back surface portion 21D, a left-side portion as viewed from the back surface is formed with a notch 21D1 having a U-shape in plan view from the lower end edge upward as shown in FIG.
Further, as shown in FIG. 1, a cutout 21E1 having a U-shape in a plan view is formed on the front surface portion 21E from the lower end edge to the upper side.

As shown in FIG. 1 or 2, the lower case 22 includes a bottom surface portion 22A and a side surface portion 22B (FIG. 2) that respectively form the bottom surface, a part of the side surface, a part of the back surface, and a part of the front surface of the exterior housing 2. ), 22C (FIG. 1), a back surface portion 22D (FIG. 2), and a front surface portion 22E (FIG. 1).
The bottom surface portion 22A is configured by a substantially rectangular flat surface, although not specifically illustrated. The bottom surface portion 22A is formed with a plurality of legs that are grounded to a grounding surface such as a desk, and an air inlet for introducing external cooling air into the projector 1.

The side portions 22B, 22C, the back surface portion 22D, and the front surface portion 22E are portions that stand upward from each edge of the bottom surface portion 22A having a rectangular shape in plan view, as shown in FIG.
Among these, in the back surface portion 22D, a left-side portion viewed from the back side is formed with a notch 22D1 having a U-shape in plan view from the upper edge toward the lower side as shown in FIG. Then, in a state where the upper case 21 and the lower case 22 are combined, the notches 21D1 and 22D1 are connected to form the opening 25. As shown in FIG. 2, a connection terminal installation portion 26 having an outer shape corresponding to the shape of the opening 25 is fitted and fixed to the opening 25.
As shown in FIG. 2, the connection terminal installation portion 26 has a substantially U-shaped cross section that is recessed inward from the end surfaces of the back surface portions 21 </ b> D and 22 </ b> D, and a plurality of holes 261 are formed in the bottom portion. As shown in FIG. 2, a plurality of connection terminals 27 for inputting image signals, audio signals, and the like from an external electronic device are exposed through the plurality of holes 261. Further, an interface board (not shown) for processing a signal input from the connection terminal 27 is arranged inside the connection terminal installation portion 26.
The interface board is electrically connected to a control board (not shown), and a signal processed by the interface board is output to the control board.

Further, in the back surface portion 22D, two openings 22D2 and 22D3 are formed below the notch 22D1, as shown in FIG. As shown in FIG. 2, the internal inlet connector 28 is exposed through the opening 22 </ b> D <b> 2 located on the left side when viewed from the back side, and external power can be supplied to the apparatus main body of the projector 1. Further, as shown in FIG. 2, the power switch 29 is exposed through the opening 22D3 located on the right side when viewed from the back side. By switching the power switch 29, the main power source of the projector 1 is turned on / off. It becomes possible.
The power switch 29 is electrically connected to a control board (not shown), and an operation signal accompanying switching of the power switch 29 is output to the control board.

  Further, as shown in FIG. 1, a cutout 22E1 having a U-shape in plan view is formed on the front surface portion 22E from the upper edge toward the lower side. In a state where the upper case 21 and the lower case 22 are combined, the front case 23 is formed at the U-shaped inner portion of the notch 21E1 of the front surface portion 21E and the U-shaped inner portion of the notch 22E1 of the front surface portion 22E. Supported and fixed.

As shown in FIG. 1, the front case 23 has a substantially elliptical shape extending in the left-right direction, and is connected to the upper case 21 and the lower case 22 to close the openings formed by the notches 21E1 and 22E1. To do.
As shown in FIG. 1, the front case 23 is formed with a recess on the inner side of the exterior housing 2 and a substantially circular opening 231 in the bottom portion, as shown in FIG. The opening 231 exposes the tip portion of the projection lens 3.
Further, in the front case 23, as shown in FIG. 1, a remote control light receiving window 232 is formed at a substantially central portion in the longitudinal direction. A remote control light receiving module (not shown) for receiving an operation signal from a remote controller (not shown) is disposed inside the remote control light receiving window 232.
The remote controller is provided with the same start switch, adjustment switch and the like provided on the operation panel 24 described above. When the remote controller is operated, an infrared signal corresponding to this operation is output from the remote controller. The infrared signal is received by the remote control light receiving module through the remote control light receiving window 232 and processed by a control board (not shown).

Further, in the front case 23, an exhaust port 233 having a rectangular shape in a plan view for discharging the air heated inside the projector 1 to the outside is formed on the left side as viewed from the front, as shown in FIG. Has been.
Further, as shown in FIG. 1, the peripheral portion of the exhaust port 233 is formed to have a cylindrical shape protruding toward the inside. More specifically, the peripheral edge portion of the exhaust port 233 is formed to have a cylindrical shape that protrudes in an inclined manner with respect to the projection direction from the projection lens 3 toward the direction close to the projection lens 3. As shown in FIG. 1, a plurality of vane plates 233 </ b> A that extend in the vertical direction and extend in the protruding direction of the peripheral portion of the exhaust port 233 are formed in the cylindrical inner portion of the exhaust port 233.

[2. Internal configuration)
3 and 4 are diagrams showing the internal configuration of the projector 1. Specifically, FIG. 3 is a perspective view of the state in which the upper case 21 and the control board are removed as viewed from the upper front side. FIG. 4 is a perspective view of the state in which the upper case 21 and the control board are removed as viewed from the upper rear side.
As shown in FIG. 3 or FIG. 4, the main body of the projector 1 is accommodated in the exterior casing 2. The apparatus main body includes an optical unit 4 as an optical apparatus, a power supply unit 5, a cooling unit 6, and the like.
Although not shown, the apparatus main body includes an optical unit 4, a power supply unit 5, a cooling unit 6, a control board that is disposed above the optical unit 4 and controls the entire projector 1.

[3. Detailed configuration of the optical unit)
FIG. 5 is a plan view schematically showing an optical system of the optical unit 4.
The optical unit 4 forms image light according to image information under the control of the control board. As shown in FIG. 3 or FIG. 4, the optical unit 4 extends in the left-right direction along the back surface portions 21 </ b> D and 22 </ b> D and extends forward along the side surface portions 21 </ b> B and 22 </ b> B. It has a shape.
As shown in FIG. 5, the optical unit 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an electro-optical device 44, a light control device 7, and these optical components 41. -44 and the light control device 7 are housed inside, and a housing 45 for optical parts made of synthetic resin for supporting and fixing the projection lens 3 at a predetermined position is provided.
The integrator illumination optical system 41 is an optical system for illuminating an image forming area of each liquid crystal panel, which will be described later, constituting the electro-optical device 44 substantially uniformly. As shown in FIG. 5, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

The light source device 411 includes a light source lamp 411A as a radiation light source that emits a radial light beam, a reflector 411B that reflects radiation light emitted from the light source lamp 411A, and a lamp housing 411C (FIGS. 3 to 5). . As the light source lamp 411A, a high-pressure discharge lamp such as a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp can be employed. A parabolic mirror is used as the reflector 411B. In addition to a parabolic mirror, an ellipsoidal mirror may be used together with a collimating concave lens.
The lamp housing 411 </ b> C houses the light source lamp 411 </ b> A and the reflector 411 </ b> B inside, and is attached to the bottom surface portion of the lower case 22 and connected to the optical component housing 45.

The first lens array 412 has a configuration in which small lenses (lens elements) having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens divides the light beam emitted from the light source lamp 411A into a plurality of partial light beams.
The second lens array 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses (lens elements) are arranged in a matrix. The second lens array 413, together with the superimposing lens 415, has a function of forming an image of each small lens of the first lens array 412 on a liquid crystal panel described later.

The polarization conversion element 414 is disposed on the downstream side of the optical path of the second lens array 413. Such a polarization conversion element 414 converts the light from the second lens array 413 into substantially one type of polarized light, thereby improving the light use efficiency in the electro-optical device 44.
Specifically, each partial light converted into approximately one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on each liquid crystal panel (described later) of the electro-optical device 44 by the superimposing lens 415. Since only one type of polarized light can be used in the projector 1 of this embodiment using a liquid crystal panel of a type that converts polarized light, almost half of the luminous flux from the light source lamp 411A that emits other types of randomly polarized light is used. Not. For this reason, by using the polarization conversion element 414, almost all the light beams emitted from the light source lamp 411A are converted into one type of polarized light, and the use efficiency of light in the electro-optical device 44 is enhanced.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red, green, and blue. It has a function of separating into three color lights.
The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding the color light separated by the color separation optical system 42 to a blue light liquid crystal panel.

  At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component and the green light component of the light beam emitted from the integrator illumination optical system 41 and reflects the red light component. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and reaches the liquid crystal panel for red light. The field lens 417 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 417 provided on the light incident side of the other liquid crystal panels for green light and blue light.

  Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 417, and reaches the liquid crystal panel for green light. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 417 to reach the liquid crystal panel for blue light. Note that the relay optical system 43 is used for blue light because the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 417 as it is. The relay optical system 43 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

The electro-optical device 44 includes three liquid crystal panels 441 (red light liquid crystal panel 441R, green light liquid crystal panel 441G, blue light liquid crystal panel 441B) and a polarization plate. A plate 442, a viewing angle correction plate 444, and a cross dichroic prism 443 as a color synthesis optical device are provided.
The liquid crystal panel 441 uses, for example, a polysilicon TFT (Thin Film Transistor) as a switching element, and each color light separated by the color separation optical system 42 is incident on these three liquid crystal panels 441 and their light fluxes. An optical image is formed by being modulated according to image information by the polarizing plates 442 on the side and the exit side.

The polarizing plate 442 includes an incident-side polarizing plate 442A and an emission-side polarizing plate 442B that are arranged on the front side and the rear side of the optical path of the liquid crystal panel 441.
The incident-side polarizing plate 442A transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. The incident-side polarizing plate 442A is a polarizing film on a substrate made of quartz or sapphire. Is affixed. The incident-side polarizing plate 442A is arranged so that the position of the incident-side polarizing plate 442A can be adjusted with respect to a predetermined illumination optical axis set in the optical component casing 45 by a position adjusting mechanism which will be described later. Has been.

The exit-side polarizing plate 442B is configured in substantially the same manner as the incident-side polarizing plate 442A, and transmits only polarized light in a predetermined direction and absorbs other light beams out of the light beams emitted from the liquid crystal panel 441. Further, the polarizing film may be attached to the cross dichroic prism 443 without using the substrate, or the substrate may be attached to the cross dichroic prism 443.
The incident side polarizing plate 442A and the emission side polarizing plate 442B are set so that the directions of the polarization axes thereof are orthogonal to each other.

  The viewing angle correction plate 444 is obtained by forming an optical conversion film having a function of correcting the viewing angle of an optical image formed by the liquid crystal panel 441 on a substrate. By arranging such a viewing angle correction plate 444, light leakage at the time of a black screen is reduced and the contrast of the projected image is greatly improved. The viewing angle correction plate 444 is a predetermined illumination set in the optical component casing 45 by a position adjusting mechanism, which will be described later, constituting the optical component casing 45 in substantially the same manner as the incident-side polarizing plate 442A. The position is adjustable with respect to the optical axis.

  The cross dichroic prism 443 forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 441. In the cross dichroic prism 443, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film.

As shown in FIG. 5, the light control device 7 is disposed between the first lens array 412 and the second lens array 413, and a pair of shielding members described later rotate under the control of the control board. Thus, the amount of illumination light emitted from the light source device 411 and directed to the second lens array 413 via the first lens array 412 is adjusted.
The specific configuration of the light control device 7 will be described later.

The optical systems 41 to 44 and the light control device 7 described above are accommodated in the optical component housing 45.
As shown in FIGS. 3 to 5, the optical component housing 45 has an illumination optical axis A (FIG. 5) of a light beam emitted from the light source device 411 set therein, and the optical components 412 to 415 described above. 417, 421 to 423, 431 to 434, 442A and 444, and groove parts (for example, see groove part 451A shown in FIG. 11) into which the light control device 7 is slidably fitted from above are provided. 451 (FIGS. 3 and 5), a lid-like lid member 452 that closes the upper opening of the component storage member 451, and a part of the lid-like member 452, including an incident side polarizing plate 442A and a viewing angle correction plate 444 and a position adjusting mechanism 445 (FIGS. 3 and 4) for adjusting the position of both of them.
Further, a light source device 411 is disposed at a predetermined position with respect to the illumination optical axis A (FIG. 5) on one end side of the optical component housing 45 having a substantially L shape in plan view, and an illumination optical axis on the other end side. The projection lens 3 is fixed at a predetermined position with respect to A. In addition, an electro-optical device 44 is fixed on the upstream side of the projection lens 3 in the optical path.

[4. (Configuration of power supply unit)
The power supply unit 5 supplies the power supplied from the outside via the inlet connector 28 (FIG. 2) to each component. As shown in FIG. 3 or 4, the power supply unit 5 is disposed on the side of the light source device 411 of the optical unit 4 and along the side surface portions 21 </ b> C and 22 </ b> C of the exterior housing 2. The power supply unit 5 includes a power supply block 51 and a lamp drive block 52 as shown in FIG.
The power supply block 51 is disposed on the side of the light source device 411, and supplies the power supplied from the outside via the inlet connector 28 to the lamp drive block 52 and the control board. The power supply block 51 includes a circuit board (not shown) on which one side of a transformer that converts input alternating current into a predetermined voltage, a conversion circuit that converts output from the transformer into direct current with a predetermined voltage, and the like. A box-shaped member 511 covering the circuit board.
As shown in FIG. 3 or 4, the box-shaped member 511 has a shape extending in the front-rear direction so as to have a substantially L shape with the light source device 411. The box-shaped member 511 is formed with a first introduction port 511A (FIG. 4) for introducing air from the cooling unit 6 into the back side thereof, and is substantially L-shaped formed with the light source device 411. A discharge port 511B (FIG. 3) for discharging the internal air to the outside is formed on the inner end surface of the shape. Although not shown, the box-shaped member 511 is formed with a second inlet for introducing the air discharged from the lamp drive block 52 to the end surface on the side away from the light source device 411.

The lamp drive block 52 is disposed along the side surfaces 21C and 22C on the side of the power supply block 51, and a circuit board on which a conversion circuit for supplying power to the light source device 411 with a stable voltage is mounted on one side. The commercial alternating current input from the power supply block 51 is rectified and converted by the lamp drive block 52 and supplied to the light source device 411 as a direct current or an alternating rectangular wave current. The circuit board of the lamp driving block 52 is housed inside the box-shaped member 521, as with the power supply block 51.
As shown in FIG. 3 or 4, the box-shaped member 521 has a shape extending in the front-rear direction in parallel with the box-shaped member 511. The box-shaped member 521 has an inlet 521A (FIG. 4) for introducing the air from the cooling unit 6 into the back side, and the box-shaped member 521 has a box on the end surface facing the box-shaped member 511. Corresponding to the second introduction port of the shaped member 511, a discharge port (not shown) for discharging the internal air to the outside is formed.

[5. Cooling unit configuration)
The cooling unit 6 cools the components inside the projector 1. As shown in FIG. 3 or 4, the cooling unit 6 includes a power supply unit cooling unit 61 that mainly cools the power supply unit 5, a light source device cooling unit 62 that discharges the air inside the projector 1 to the outside, and the like. Consists of including.
Although not specifically shown, the cooling unit 6 also includes a liquid crystal panel cooling unit including cooling fans and ducts for cooling the liquid crystal panels 441 and the polarization conversion elements 414.

  As shown in FIG. 3 or FIG. 4, the power supply unit cooling unit 61 is disposed in a space between the light source device 411 and the power supply unit 5 and the rear portions 21 </ b> D and 22 </ b> D of the exterior housing 2. As shown in FIG. 3 or 4, the power supply unit cooling unit 61 includes an intake side duct 611, a sirocco fan 612, and a first exhaust side duct 613. Then, the power supply unit cooling unit 61 drives the sirocco fan 612 to cool the cooling air outside the projector 1 from an intake port (not shown) to an intake side duct 611 to an sirocco fan 612 to an exhaust side duct formed in the lower case 22. The air flow passages 613 are traced to be introduced into the box-shaped members 511 and 521 through the inlets 511A and 521A of the box-shaped members 511 and 521 constituting the power supply unit 5, respectively. The air introduced into the box-shaped member 521 in the power supply unit 5 passes through the outlet (not shown) of the box-shaped member 521 and the second inlet (not shown) of the box-shaped member 511. To be introduced. Inside the box-shaped member 521, when air flows from the inlet 521A to the outlet, the circuit board of the lamp driving block 52 is cooled. Further, the air introduced into the box-shaped member 511 in the power supply unit 5 is discharged to the substantially L-shaped inner portion formed by the box-shaped member 511 and the light source device 411 via the discharge port 511B. In the box-shaped member 511, when air flows from the first introduction port 511A and the second introduction port to the discharge port 511B, the circuit board of the power supply block 51 is cooled.

  As shown in FIG. 3 or FIG. 4, the light source device cooling unit 62 is disposed in a substantially L-shaped inner portion formed by the light source device 411 and the box-like member 511. As shown in FIG. 3 or FIG. 4, the light source device cooling unit 62 includes an axial fan 621 and a second exhaust side duct 622. Then, the light source device cooling section 62 is driven by the axial fan 621 so that air in the substantially L-shaped inner portion formed by the light source device 411 and the box-like member 511 (air discharged via the power supply unit 5 or the like). ) Or other space, the projector is moved in a direction away from the projection direction of the projection lens 3 through the exhaust port 233 of the front case 23 through the air flow path of the axial fan 621 to the second exhaust duct 622. 1 Discharge outside. More specifically, as shown in FIG. 3 or 4, the lamp housing 411 </ b> C constituting the light source device 411 is formed with a plurality of holes 411 </ b> C <b> 1 that allow air to flow inward and outward on each end face facing in the front-rear direction. When the axial fan 621 is driven, the air inside the lamp housing 411C is sucked into the axial fan 621 through the plurality of holes 411C1. In the lamp housing 411C, when the air flows through the plurality of holes 411C1, the light source lamp 411A and the reflector 411B are cooled.

[6. Configuration of light control device]
6 to 8 are diagrams showing a schematic configuration of the light control device 7. Specifically, FIG. 6 is a perspective view of the light control device 7 viewed from the light beam incident side. FIG. 7 is a perspective view of the light control device 7 as seen from the light beam exit side. FIG. 8 is an exploded perspective view of the light control device 7 as viewed from the light beam emission side.
6 to 8, for convenience of explanation, the optical axis of the incident light beam is the Z axis, and two axes orthogonal to the Z axis are the X axis (horizontal axis) and the Y axis (vertical axis).
As shown in FIGS. 6 to 8, the light control device 7 includes a fixing member 71, a rotating shaft 72, a drive mechanism 73, a pair of shielding members 74, a biasing member 75, and a position detection unit 76 ( 6 and 8), three floating fixing mechanisms 77, and a thermistor unit 78 that measures the temperature of the light control device 7.

The fixing member 71 supports and integrates the rotation shaft 72, the drive mechanism 73, the pair of shielding members 74, the biasing member 75, and the position detection unit 76, and the entire light control device 7 is the optical component housing 45. It is the part which can be attached or detached with respect to. As shown in FIGS. 6 to 8, the fixing member 71 includes a first fixing member 711 and a second fixing member 712.
As shown in FIGS. 6 to 8, the first fixing member 711 is composed of a plate-like member having a substantially U-shape in plan view when viewed from the Z-axis direction, and has a U-shaped proximal end surface 7111. The drive mechanism 73 and the position detector 76 are supported, and the base end side end surface 7111 supports the −X axis direction side of the pair of shielding members 74 via the rotation shaft 72 and the drive mechanism 73 so as to be rotatable. .

In the first fixing member 711, on the base end side end surface 7111, as shown in FIG. 8, shaft mounting holes 7111A and 7111B for mounting the rotating shaft 72 are formed on both ends of the Y axis direction. Yes. As shown in FIG. 8, these shaft mounting holes 7111A and 7111B are symmetrical with respect to a horizontal plane (XZ plane) passing through the illumination optical axis A in a state where the light control device 7 is installed in the optical component casing 45. Each is formed at a position.
Further, in the first fixing member 711, the base end side end surface 7111 has motor fixing holes 7111C for fixing a motor, which will be described later, of the drive mechanism 73 to both ends of the Z-axis direction, as shown in FIG. 7111D is formed.
Further, in the first fixing member 711, on the base end side end surface 7111, as shown in FIG. 8, a motor shaft insertion hole for inserting the motor shaft of the motor between the motor fixing holes 7111C and 7111D. 7111E is formed.

In the first fixing member 711, the base end side end surface 7111 has first fixing portions 7111F (FIGS. 7 and 8) and 7111G extending along the XZ plane as shown in FIGS. (FIGS. 6 and 8) are formed. The first fixing portions 7111 </ b> F and 7111 </ b> G are portions for fixing the first fixing member 711, that is, the entire light control device 7 to the optical component casing 45 via the floating fixing mechanism 77.
Further, in the first fixing member 711, fixing ends 7112A for fixing the second fixing member 712 to the + X axial direction end portion side are provided on each of the U-shaped end side end surfaces 7112 as shown in FIG. Are formed respectively.

As shown in FIGS. 6 to 8, the second fixing member 712 is configured by a plate-like member having a substantially U-shape in plan view when viewed from the Z-axis direction, and has a U-shaped proximal end surface 7121. Thus, the + X axis direction side of the pair of shielding members 74 is rotatably supported via the rotation shaft 72.
In the second fixing member 712, the proximal end surface 7121 has a position corresponding to the shaft mounting holes 7111 </ b> A and 7111 </ b> B of the first fixing member 711 in a state where the first fixing member 711 and the second fixing member 712 are assembled. Shaft mounting holes 7121A and 7121B for mounting the rotating shaft 72 are formed.
Further, in the second fixing member 712, as shown in FIG. 8, the base end side end surface 7121 protrudes from the −Z axial end edge along the XY plane in the + X axial direction, and the −Y axial end of the protruding portion. A second fixing portion 7121C whose edge extends in the + Z-axis direction along the XZ plane is formed. The extending portion of the second fixing portion 7121C is for fixing the entire light control device 7 to the optical component housing 45 via the floating fixing mechanism 77 together with the first fixing portions 7111F and 7111G of the first fixing member 711. It is a part of.
Further, in the second fixing member 712, as shown in FIG. 8, the base end side end surface 7121 protrudes in the + X-axis direction at the central portion in the Y-axis direction at the edge in the Z-axis direction, and the distal end portion in the protruding direction is − A biasing member mounting portion 7121D extending in the Z-axis direction is formed. The urging member attaching portion 7121D is a part for attaching the urging member 75.

  Further, in the second fixing member 712, each U-shaped end surface 7122 has a fixing hole 7122A corresponding to the fixing hole 7112A of the first fixing member 711, as shown in FIG. Has been. Then, each fixing screw 713 (FIG. 8) is inserted into each fixing hole 7112A, and each fixing screw 713 is screwed into each fixing hole 7122A, so that the first fixing member 711 and the second fixing member 712 are engaged. Connected. When the first fixing member 711 and the second fixing member 712 are connected, the first fixing member 711 and the second fixing member 712 have a rectangular frame shape when viewed from the Z-axis direction.

As shown in FIG. 8, the rotating shaft 72 includes four rotating shafts 72A, 72B, 72C, and 72D. As shown in FIG. 8, each of these rotating shafts 72 has a substantially cylindrical shape and pivotally supports a pair of shielding members 74 so as to be rotatable.
More specifically, one end side of each of the rotating shafts 72A and 72C is inserted into each shaft mounting hole 7111A and 7111B of the first fixing member 711, and the driving mechanism 73 described later is driven on the other end side. The gear is pivotally supported and the −X axial direction side of the pair of shielding members 74 is pivotally supported via the drive gear.
Further, one end side of each of the rotating shafts 72B and 72D is inserted into each shaft mounting hole 7121A and 7121B of the second fixing member 712, and the + X axial direction side of the pair of shielding members 74 on the other end side. Is pivotally supported.

The drive mechanism 73 is a member that rotates the pair of shielding members 74 by being driven while being supported by the fixing member 71. As shown in FIG. 8, the drive mechanism 73 includes a motor 731 and a drive gear 732.
The motor 731 is a general motor and is driven under the control of the control board. The motor 731 is disposed such that the motor shaft 7311 is oriented in the + X-axis direction and is inserted into the motor shaft insertion hole 7111E of the fixing member 71. The motor 731 is first fixed by inserting the fixing screws 733 (FIG. 8) into the motor fixing holes 7111C and 7111D of the fixing member 71 and screwing the fixing screws 733 into the fixing holes 7312 and 7313, respectively. The member 711 is fixed to the end surface in the −X-axis direction.
Further, a pinion 7314 for transmitting the rotation of the motor shaft 7311 to the drive gear 732 is attached to the tip portion of the motor shaft 7311 as shown in FIG.

As shown in FIG. 8, the drive gear 732 includes two parts, a first drive gear 7321 and a second drive gear 7322, and transmits the rotation of the motor shaft 7311 (rotation of the pinion 7314) to the pair of shielding members 74. It is a member.
As shown in FIG. 8, the first drive gear 7321 has a fan shape in plan view, and is attached to the + X-axis direction end surface of the first fixing member 711 via a rotation shaft 72 </ b> A. As shown in FIG. 8, the first drive gear 7321 includes a gear body 7321A and a meshing portion 7321B.

As shown in FIG. 8, the gear main body 7321A is a portion that is pivotally supported by the rotation shaft 72A, and a circular hole that allows the other end side of the rotation shaft 72A to be inserted into the base end portion. 7321A1 is formed.
Further, as shown in FIG. 8, the gear body 7321A has an end face that protrudes from the end face in the + X-axis direction and extends radially from the center position of the circular hole 7321A1 (Y-axis direction in FIG. 8). A portion 7321A2 is formed.
The attachment portion 7321A2 is a member for attaching the first shielding member 741 disposed on the + Y-axis direction side of the pair of shielding members 74 to the first drive gear 7321. A fixing hole 7321A3 for fixing the first shielding member 741 via a fixing screw 734 (FIG. 8) is formed at a substantially central position of the mounting portion 7321A2.
The meshing portion 7321 </ b> B is a portion that is formed in an arc-shaped portion at the tip portion of the gear main body 7321 </ b> A and meshes with the pinion 7314 and the second drive gear 7322.

As shown in FIG. 8, the second drive gear 7322 has substantially the same shape as the first drive gear 7321, and the gear body 7321 </ b> A (circular hole 7321 </ b> A <b> 1, mounting portion 7321 </ b> A <b> 2, and fixing hole) of the first drive gear 7321. 7321A3) and a meshing portion 7321B, and a gear body 7322A (including a circular hole 7322A1, a mounting portion 7322A2, and a fixing hole 7322A3) and a meshing portion 7322B.
Here, the other end side of the rotating shaft 72C is inserted into the circular hole 7322A1, and the second drive gear 7322 is pivotally supported.
The attachment portion 7322A2 is a member for attaching the second shielding member 742 disposed on the −Y axis direction side of the pair of shielding members 74 to the second drive gear 7322.
Further, the meshing portion 7322B is a portion that meshes with the meshing portion 7321B of the first drive gear 7321. That is, the second drive gear 7322 rotates in synchronization with the rotation of the first drive gear 7321.

The pair of shielding members 74 are rotatably supported with respect to the fixed member 71 via the rotation shaft 72 and the drive mechanism 73, and partially rotate the light beam emitted from the first lens array 412 by rotating. It is a member to be shielded.
The first shielding member 741 disposed on the + Y-axis direction side of the pair of shielding members 74 is constituted by a plate-like member as shown in FIG. 8, and the X-axis direction substantially central portion 7411 is on the + Z-axis direction side. The both ends 7412 in the X-axis direction have a stepped shape positioned on the −Z-axis direction side. More specifically, a substantially central portion 7411 in the X-axis direction having a substantially rectangular shape in plan view is a light-shielding region capable of shielding the light beam emitted from the first lens array 412, and both end portions 7412 in the X-axis direction are the first lens array. This is a non-light-shielding region that does not shield the light beam emitted from 412. In other words, the pair of shielding members 74 has a light shielding region (substantially central portion 7411 in the X-axis direction) close to the second lens array 412 in a state where the light control device 7 is installed in the optical component casing 45, and a non-light shielding region. (X-axis direction both end portions 7412) are located on the side away from the second lens array 412.

Of the both end portions 7412 in the X-axis direction, the portion located on the −X-axis direction side functions as an attachment portion 7412A attached to the attachment portion 7321A2 of the first drive gear 7321 as shown in FIG. The mounting portion 7412A has a fixing hole 7412A1 corresponding to the fixing hole 7321A3 of the mounting portion 7321A2. The first shielding member 741 is connected to the first drive gear 7321 by inserting the fixing screw 734 (FIG. 8) through the fixing hole 7412A1 and screwing the fixing screw 734 into the fixing hole 7321A3.
In addition, in the X-axis direction both end portions 7412, a portion located on the + X-axis direction side has a mounting portion 7412B extending in the + Z-axis direction along the YZ plane from the + X-axis direction end edge, as shown in FIG. Is formed. The mounting portion 7412B is formed with a shaft mounting hole 7412B1 corresponding to the shaft mounting hole 7121A of the second fixing member 712. By inserting the rotation shaft 72B through the shaft mounting holes 7412B1 and 7121A, the + X-axis direction side of the first shielding member 741 is rotatably supported by the rotation shaft 72B with respect to the second fixing member 712. .

Further, the second shielding member 742 disposed on the −Y-axis direction side of the pair of shielding members 74 has substantially the same shape as the shielding member 741 as shown in FIG. 8, and the first shielding member 741. X-axis direction substantially central portion 7411 and X-axis direction both end portions 7412 (including the mounting portion 7412A, the fixing hole 7412A1, the mounting portion 7412B, and the shaft mounting hole 7412B1). And X-axis direction both end portions 7422 (including a mounting portion 7422A, a fixing hole 7422A1, a mounting portion 7422B, and a shaft mounting hole 7422B1).
The X-axis direction substantially central portion 7421 becomes the above-described light shielding region, and the X-axis direction both end portions 7422 becomes the above-described non-light-shielding region.
Further, the second shielding member 742 is connected to the second drive gear 732 by inserting the fixing screw 734 (FIG. 8) through the fixing hole 7422A1 and screwing the fixing screw 734 into the fixing hole 7322A3.
Further, the rotation shaft 72D is inserted into the shaft mounting holes 7422B1 and 7121B, so that the + X-axis direction side of the second shielding member 741 is rotatably supported with respect to the second fixing member 712 by the rotation shaft 72D. Is done.

  As shown in FIG. 8, the urging member 75 is constituted by a coil spring, and is formed so as to have a substantially V shape in plan view in which each end portion 752 of the spring extends from the spring body 751 by a predetermined dimension. Further, the tip portion of each end portion 752 is bent in a direction toward the outside of the V shape. The urging member 75 hangs the spring main body 751 on the urging member attaching portion 7121D of the second fixing member 712 in a state where the light control device 7 is assembled, and the end portions of the end portions 752 are connected to the second fixing member. The rotating shafts 72B and 72D projecting from the shaft mounting holes 7121A and 7121B of the 712 are arranged in a state of being hooked to the tip end portions of the one end portions. In this state, the urging member 75 exerts an urging force toward the outside of the V shape, and causes the rotating shafts 72B and 72C to abut on the inner peripheral edges of the shaft mounting holes 7121A and 7121B.

As shown in FIG. 8, the position detector 76 is attached to the + Y-axis direction end of the first fixing member 711, detects the rotational position of the shielding member 74, and outputs a signal corresponding to the detected rotational position. This is the part that outputs to the control board. In the present embodiment, the position detection unit 76 employs a photo reflector in which a light emitting diode that emits infrared light and a phototransistor that detects reflected light of the emitted infrared light are combined into one element. Then, the position detector 76 emits infrared rays in the + X-axis direction in FIG. 8, detects infrared reflected light reflected by the gear body 7321 </ b> A of the first drive gear 7321, and rotates the first drive gear 7321. The moving position, that is, the rotational position of the shielding member 74 is detected.
As shown in FIGS. 6 to 8, the thermistor unit 78 is mounted on the front end side end surface 7112 on the + Y-axis direction side of each front end side end surface 7112 of the first fixing member 711, and the temperature of the entire light control device 7 is adjusted. To detect. The thermistor unit 78 then outputs a signal corresponding to the detected temperature of the entire light control device 7 to the control board. Since the temperature of the entire light control device 7 also rises due to heat generated when the light beam from the light source device 411 is shielded by the pair of shielding members 74, it is necessary to monitor whether the temperature is within a predetermined temperature range. The control board stops the operation of the projector 1 when the temperature of the entire light control device 7 exceeds a predetermined temperature range due to some trouble.

FIG. 9 is a diagram illustrating a driving state of the light control device 7. Specifically, FIG. 9 is a perspective view of the light control device 7 viewed from the light beam incident side. In FIG. 9, as in FIGS. 6 to 8, the optical axis of the incident light beam is the Z axis, and the two axes orthogonal to the Z axis are the X axis (horizontal axis) and the Y axis (vertical axis).
As shown in FIG. 9, the light control device 7 is centered on a pair of shafts (rotating shaft 72A and rotating shaft 72B, rotating shaft 72C and rotating shaft 72D) parallel to the X axis, as shown in FIG. The pair of shielding members 74 rotate in a symmetrical state (synchronized state).
Then, as shown in FIG. 9A, the first shielding member 741 is rotated so that the −Y-axis direction edge of the substantially central portion 7411 in the X-axis direction of the first shielding member 741 moves to the + Y-axis direction side. Similarly, the second shielding member 742 is rotated so that the + Y-axis direction edge of the substantially central portion 7421 in the X-axis direction of the second shielding member 742 moves to the −Y-axis direction side. At the limit position (fully opened position) when moving, the light beam emitted from the first lens array 412 is directed to the second lens array 413 without being shielded by the pair of shielding members 74.

  As shown in FIG. 9B, the first shielding member 741 is shielded so that the −Y-axis direction edge of the substantially central portion 7411 in the X-axis direction is located in the −Y-axis direction with respect to the fully opened position. The position when the member 741 is rotated, similarly, the second shielding member 742 so that the + Y-axis direction edge of the substantially central portion 7421 in the X-axis direction is located in the + Y-axis direction with respect to the fully opened position. At the position when the member 741 is rotated, the light beam emitted from the first lens array 412 is a pair of shielding members that is directed to each lens element formed on both ends of the second lens array 413 in the Y-axis direction. The light is shielded at 74.

  Further, as shown in FIG. 9C, the first shielding member 741 is rotated so that the −Y-axis direction end edge of the substantially central portion 7411 in the X-axis direction of the first shielding member 741 moves in the −Y-axis direction. Similarly, the second shielding member 742 is rotated so that the + Y-axis direction edge of the substantially central portion 7421 in the X-axis direction of the second shielding member 742 moves in the + Y-axis direction. At the limit position (fully closed position), the light beam emitted from the first lens array 412 is substantially entirely shielded by the pair of shielding members 74.

The control board calculates, for example, a luminance value based on an image signal input from the outside, and the calculated luminance value and a signal output from the position detection unit 76 (rotation position of the pair of shielding members 74). Based on the above, the motor 731 is driven and controlled. More specifically, the control board drives and controls the motor 731. When the luminance value is high, the control board is rotated so that the pair of shielding members 74 are positioned on the fully opened position side, and the luminance value is low. Is rotated so that the pair of shielding members 74 are positioned on the fully closed position side.
Further, if the position detection unit 76 is configured to detect the initial position of the pair of shielding members 74, the control board drives and controls the motor 731 when the projector 1 is started, for example, so that the pair of shielding members 74 are set to the initial positions. It can be positioned.

FIG. 10 is a cross-sectional view showing a schematic configuration of the floating fixing mechanism 77.
As shown in FIG. 10, the three floating fixing mechanisms 77 are members for fixing the entire light control device 7 to the optical component housing 45 via the first fixing portions 7111F and 7111G and the second fixing portion 7121C. is there. Since the three floating fixing mechanisms 77 have the same configuration, only one floating fixing mechanism 77 will be described below.
As shown in FIG. 10, the floating fixing mechanism 77 includes a fixing screw 771, a washer 772, a cylindrical portion 773, and an elastic member 774.
As shown in FIG. 10, the fixing screw 771 is inserted into fixing holes 7111F1, 7111G1, 7121C1 formed in the first fixing portions 7111F, 7111G and the second fixing portion 7121C, and is used for fixing the optical component casing 45. A member that is screwed into the hole 451B. As shown in FIG. 10, the fixing screw 771 includes a rotation end 7711, a contact portion 7712, and a screw portion 7713.
Among these, as shown in FIG. 10, the contact portion 7712 has a substantially cylindrical shape having a diameter larger than that of the screw portion 7713, and the length in the cylindrical axis direction is the thickness of the washer 772 and the elastic member 774. Have slightly smaller dimensions. In a state where the screw portion 7713 of the fixing screw 771 is screwed into the fixing hole 451B of the optical component housing 45, the contact portion 7712 contacts the peripheral portion of the fixing hole 451B.

  As shown in FIG. 10, the cylindrical portion 773 is configured to be able to insert the abutting portion 7712 and the screw portion 7713 of the fixing screw 771, and the length dimension in the cylindrical axial direction of the abutting portion 7712 of the fixing screw 771. The length is approximately the same as the length in the cylinder axis direction. The cylindrical portion 773 has a function of preventing the deformation of the elastic member 774 and the like.

As shown in FIG. 10, the elastic member 774 has a substantially cylindrical shape that allows the contact portion 7712 of the fixing screw 771 and the screw portion 7713 and the cylindrical portion 773 to be inserted. As shown in FIG. 10, the elastic member 774 has an annular recess 7741 formed in the circumferential direction of the cylinder and recessed toward the center of the cylinder axis at the substantially central portion in the cylinder axis direction on the outer peripheral surface.
The elastic member 774 is inserted into the fixing holes 7111F1, 7111G1, 7121C1 formed in the first fixing portions 7111F, 7111G and the second fixing portion 7121C, and the peripheral portions of the fixing holes 7111F1, 7111G1, 7121C1 are inserted into the recesses 7741. Are arranged to fit.

With the above-described configuration, the floating fixing mechanism 77 is screwed into the fixing hole 451B of the optical component casing 45 so that the rotating end 7711 and the washer 772 of the fixing screw 771 and the optical component casing are engaged. The elastic member 774 is compressed between the bodies 45, and the fixing member 71 is supported and fixed to the optical component housing 45 via the elastic member 774. In this state, the fixing member (the light control device 7) is fixed by the elastic member 774 in a non-interfering state that does not mechanically interfere with the optical component housing 45.
In the present embodiment, the first fixing portions 7111F, 7111G and the second fixing portion 7121C, and the three floating fixing mechanisms 77 corresponding to these fixing portions 7111F, 7111G, 7121C are provided at two locations sandwiching the motor 731. Position (each position of the first fixing portion 7111F, 7111G), and a position (a position of the second fixing portion 7121C) that becomes a triangle (a triangle parallel to the XZ plane) across the illumination optical axis A from the two positions. The weight of the entire light control device 7 is balanced.

The embodiment described above has the following effects.
FIG. 11 is a diagram for explaining the effect of the embodiment. In FIG. 11, for convenience of explanation, only the first shielding member 741 is illustrated in the light control device 7, and only the support structure including the groove portion 451 </ b> A that supports the second lens array 413 is illustrated in the optical component housing 45. ing.
In the present embodiment, the light control device 7 is disposed between the first lens array 412 and the second lens array 413, and is configured to be rotatable so that the light beam emitted from the first lens array 412 is partly rotated. A pair of shielding members 74 are provided for shielding. Then, in a state where the pair of shielding members 74 are positioned at the fully closed position, the X-axis direction substantially central portions 7411 and 7421 that are light shielding regions are located on the light emission side, and both end portions in the X-axis direction that are non-light shielding regions. 7412 and 7422 have a stepped shape located on the light beam incident side. As a result, as shown in FIG. 11, the X-axis direction both end portions 7412 of the first shielding member 741 mechanically interfere with the support structure including the groove portion 451A of the second lens array 413 in the optical component housing 45. The central portion 7411 in the X-axis direction of the first shielding member 741 can be disposed in the vicinity of the second lens array 413 without doing so. In addition, as shown in FIG. 11, even when the first shielding member 741 is rotated, the first shielding member 741 and the groove portion 451A that supports the second lens array 413 in the optical component housing 45 are included. A structure that can avoid mechanical interference with the support structure can be realized. The second shielding member 742 is the same as the first shielding member 741 described above.
Therefore, a structure in which the pair of shielding members 74 can be disposed close to the second lens array 413 and does not mechanically interfere with the support structure including the groove portion 451A even when the pair of shielding members 74 are rotated can be realized. Therefore, it is possible to dispose the light control device 7 in a narrow space without unnecessarily increasing the space, and the light control device 7 emits the light from the light source device 411 and the second lens array 413 through the first lens array 412. It is possible to satisfactorily adjust the amount of illumination light directed to.

  Here, the light control device 7 includes a fixing member 71 that supports and integrates the pair of shielding members 74, the rotating shaft 72, and the driving mechanism 73. That is, in the light control device 7, the pair of shielding members 74, the rotation shaft 72, and the drive mechanism 73 are unitized by the fixing member 71. Then, the fixing member 71 makes the entire light control device 7 detachable from the optical component housing 45 by the floating fixing mechanism 77. Thereby, for example, compared to a configuration in which the pair of shielding members 74, the rotation shaft 72, and the drive mechanism 73 are directly supported by the optical component housing 45, the light control device 7 is replaced due to some trouble. At this time, the entire light control device 7 can be removed from the optical component housing 45 by removing the fixing screw 771, and the light control device 7 can be easily replaced. Further, it is not necessary to directly attach the pair of shielding members 74, the rotation shaft 72, and the drive mechanism 73 to the optical component casing 45 in a narrow space inside the optical component casing 45, and the pair of shielding members is not performed. After attaching the member 74, the rotation shaft 72, and the drive mechanism 73 to the fixed member 71, the dimmer 7 can be installed simply by attaching the dimmer 7 to the optical component casing 45. Can be easily assembled.

The floating fixing mechanism 77 is elastic between the rotating end 7711 of the fixing screw 771 and the washer 772 and the optical component housing 45 by screwing the fixing screw 771 into the fixing hole 451B of the optical component housing 45. The member 774 is compressed to support and fix the fixing member 71, and the fixing member 71 is fixed by the elastic member 774 in a non-interference state that does not mechanically interfere with the optical component housing 45. As a result, vibration due to driving of the motor 731 constituting the drive mechanism 73 can be absorbed by the elastic member 774, and transmission of the vibration to the optical component casing 45 can be avoided. For this reason, the projection image enlarged and projected by the projection lens 3 does not vibrate in conjunction with the vibration, and the user can view the projection image satisfactorily.
Further, since the urging member 75 urges the rotating shafts 72B and 72D against the second fixing member 712, the mounting play between the rotating shafts 72B and 72D and the fixing member 71 can be eliminated, and a pair of shields are provided. The light amount of illumination light can be satisfactorily adjusted by the dimmer 7 by rotating the member 74 satisfactorily.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, the rotation shafts 72A and 72B and the rotation shafts 72C and 72D are respectively disposed at positions that are symmetrical with respect to a horizontal plane (XZ plane) passing through the illumination optical axis A. Then, the first shielding member 741 is rotated so that the edge in the −Y-axis direction moves in the Y-axis direction according to the arrangement position of the rotation shafts 72A, 72B, 72C, 72D, and the second shielding member 741 is + Y It rotates so that an axial direction edge moves to a Y-axis direction. However, the present invention is not limited to this. For example, the first shielding member 741 and the second shielding member 742 are arranged so as to be 90 ° rotationally symmetric about the illumination optical axis A, and the rotation direction is the rotation direction described in the above embodiment. You may employ | adopt the structure set as the rotation direction used as the rotation symmetry of 90 degrees centering | focusing on the illumination optical axis A. FIG. For example, when the number of the lens elements of the first lens array 412 and the second lens array 413 is larger in the vertical direction than the number of the lens elements in the first lens array 412, the rotation direction of the embodiment may be adopted. In the case where the number of lens elements in the 412 and the second lens array 413 in the horizontal direction is larger than the number in the vertical direction, the rotational symmetry is 90 ° about the illumination optical axis A with respect to the rotation direction of the embodiment. What is necessary is just to employ | adopt the structure used as the rotation direction which becomes. That is, by setting the rotation direction in this way, a wide light control lens can be taken when the light control device 7 adjusts the amount of illumination light.

  In the above embodiment, the configuration of the floating fixing mechanism 77 is not limited to the configuration described in the above embodiment, and the non-interference state in which the fixing member 71 (the light control device 7) and the optical component housing 45 do not mechanically interfere with each other. Any configuration may be adopted as long as the light control device 7 can be fixed to the optical component casing 45 so that

In the embodiment, the arrangement position and configuration of the position detection unit 76 are not limited to the arrangement position and configuration described in the embodiment, and other arrangement positions and configurations may be adopted.
For example, the position detection unit 76 is attached to the first fixing member 711 and detects the rotation position of the first drive gear 7321, but is not limited thereto, and the second drive gear 7322, the first shielding member 741, Or you may employ | adopt the structure arrange | positioned in the position which can detect rotation position, such as the 2nd shielding member 742. FIG.
Further, for example, the position detection unit 76 is configured by a photo reflector. However, the configuration is not limited thereto, and the position detection unit 76 is disposed on the motor shaft 7311 of the motor 731 and is configured as a rotary encoder that detects the rotation speed of the motor shaft 7311. It may be adopted.

  In the above embodiment, the entire light control device 7 is unitized by the fixing member 71. However, the fixing member 71 is omitted, and the rotating shaft 72, the drive mechanism 73, the pair of shielding members 74, and the like are included in the optical component housing. The object of the present invention can be satisfactorily achieved even if a structure for directly attaching to the body 45 is employed.

In the above embodiment, the projector 1 using the three liquid crystal panels 441 has been described. However, the present invention is not limited to this. For example, the present invention can be applied to a projector using one liquid crystal panel, a projector using two liquid crystal panels, or a projector using four or more liquid crystal panels. The liquid crystal panel 441 employs a transmissive type. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device (trademark of Texas Instruments Inc.). ) May be adopted. When the digital micromirror device is employed, the incident side polarizing plate 442A and the emission side polarizing plate 442B are not necessary.
In the embodiment, the optical unit 4 has a substantially L-shaped shape in plan view, but other shapes may be employed, for example, a substantially U-shaped shape in plan view.
In the above embodiment, only an example of a front type projector that projects from the direction of observing the screen has been described. However, the present invention is also applicable to a rear type projector that projects from the side opposite to the direction of observing the screen. Is possible.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but it is not intended to depart from the technical concept and scope of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

The present invention can be used as a projector used in presentations, home theaters, and the like because the light amount of illumination light can be well adjusted by the light control device without increasing the installation space of the light control device.
Available.

FIG. 2 is a perspective view illustrating an appearance of a projector according to the present embodiment. The perspective view which shows the external appearance of the projector in the said embodiment. FIG. 2 is a diagram showing an internal configuration of a projector in the embodiment. FIG. 2 is a diagram showing an internal configuration of a projector in the embodiment. The top view which shows typically the optical system of the optical unit in the said embodiment. The figure which shows schematic structure of the light modulation apparatus in the said embodiment. The figure which shows schematic structure of the light modulation apparatus in the said embodiment. The figure which shows schematic structure of the light modulation apparatus in the said embodiment. The figure which shows the drive state of the light modulation apparatus in the said embodiment. Sectional drawing which shows schematic structure of the floating fixing mechanism in the said embodiment. The figure for demonstrating the effect of the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Projection lens (projection optical apparatus), 7 ... Light control apparatus, 41 ... Integrator illumination optical system, 45 ... Case for optical components, 71 ... Fixed 72, 72A, 72B, 72C, 72D ... rotating shaft, 73 ... drive mechanism, 74, 741, 742 ... shielding member, 75 ... biasing member, 411 ... light source device 412 ... 1st lens array, 413 ... 2nd lens array, 415 ... Superimposing lens, 441 ... Liquid crystal panel (light modulation device), 774 ... Elastic member, 7411, 7421. X-axis direction substantially central portion (light-shielding region), 7412, 7422... X-axis direction both end portions (non-light-shielding region), A ... illumination optical axis.

Claims (4)

An integrator illumination optical system having a light source, a light modulation device that modulates a light beam emitted from the integrator illumination optical system according to image information to form an optical image, a projection optical device that enlarges and projects the optical image, and A projector comprising an optical component housing in which an illumination optical axis is set and the integrator illumination optical system and the light modulation device are arranged at positions corresponding to the illumination optical axis,
The integrator illumination optical system includes a first lens array having a plurality of lens elements that divide a light beam emitted from the light source into a plurality of partial light beams, and a plurality of lens elements corresponding to the plurality of lens elements of the first lens array. A second lens array having lens elements, and a superimposing lens that superimposes the plurality of partial light beams on an image forming region of the light modulation device together with the second lens array,
Dimming that is disposed between the first lens array and the second lens array in the optical component housing and adjusts the amount of light emitted from the first lens array and incident on the second lens array. Equipped with equipment,
The light control device includes a pair of shielding members that are arranged symmetrically with respect to the illumination optical axis, and that can rotate and partially shield the light beam emitted from the first lens array by rotating. And
In the state in which the pair of shielding members are rotated until the shielding member shields the light beam most, a light shielding region for shielding the light beam emitted from the first lens array is located on the light beam emission side, and the first lens A projector having a stepped shape in which a non-light-shielding region that does not shield a light beam emitted from an array is located on a light beam incident side. The projector according to claim 1, wherein
The light control device includes a rotation shaft that pivotally supports the pair of shielding members, a drive mechanism that engages the pair of shielding members and rotates the pair of shielding members, and the rotation shaft. A projector comprising: a fixing member that supports and integrates the pair of shielding members and the driving mechanism, and makes the light control device detachable from the optical component housing. The projector according to claim 2,
The fixing member is attached to the optical component casing via an elastic member, and in a state where the fixing member is attached to the optical component casing, the elastic member does not mechanically interfere with the optical component casing. A projector characterized by being in a state. In the projector according to claim 2 or 3,
The projector according to claim 1, wherein an urging member that urges the rotating shaft against the fixed member is provided at an attachment position of the rotating shaft with respect to the fixed member.

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