JP2009300908A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector suppressing vibration transmitted to optical components of a color separation optical device or the like. <P>SOLUTION: The projector comprises an illuminating optical device having a light source; a color separation optical device for separating luminous flux emitted from the illuminating optical device, into a plurality of color light beams; and an image forming apparatus 270 modulating and combining each of the plurality of color light beams according to image information to form image light. The projector comprises a first enclosure 5 enclosing the illuminating optical device; a second enclosure 6 enclosing the color separation optical device; and a holding member 7 holding the first enclosure 5 and the second enclosure 6. The first enclosure 5 and the second enclosure 6 are separately held to the holding member 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector that projects image light.

Conventionally, an illumination optical device having a light source, a color separation optical device that separates a light beam emitted from the illumination optical device into a plurality of color lights, and a plurality of color lights are modulated and combined in accordance with image information to form image light. There is known a projector including an image forming apparatus.
This projector is equipped with a cooling fan in order to suppress the temperature rise in order to cause the temperature rise of the light source itself and internal components with the lighting of the light source, and to reduce the performance and function of those components. (For example, refer to Patent Document 1).

The projector of Patent Document 1 includes an optical component housing that stores optical components, a sirocco fan as a cooling fan, an axial fan, and the like.
The optical component casing has a rectangular parallelepiped shape extending long in a predetermined direction, and stores optical components such as an illumination optical device, a color separation optical device, and an image forming device (electro-optical device). The sirocco fan is disposed in the vicinity of the illumination optical device and blows air to the illumination optical device. The axial fan is disposed at an end in the outer casing near the illumination optical device, and exhausts air around the illumination optical device to the outside.

JP 2007-256899 A

  However, the technique described in Patent Document 1 is a technique that allows the color separation optical device, the image forming apparatus, and the like housed in the optical component casing to be transmitted when vibration due to the driving of the cooling fan is transmitted to the optical component casing. There is a possibility that the constituent optical components vibrate. When these optical components vibrate, there is a possibility that the image quality of the image light is deteriorated due to the fact that it cannot be separated into appropriate color light or the image light vibrates.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes an illumination optical device having a light source, a color separation optical device that separates a light beam emitted from the illumination optical device into a plurality of color lights, and image information for each of the plurality of color lights. And a first housing that houses the illumination optical device and a second housing that houses at least the color separation optical device. And a holding member that holds the first casing and the second casing, and the first casing and the second casing are separated and held by the holding member. It is characterized by.

  According to this projector, since the first housing that houses the illumination optical device is separated from the second housing, the weight load of the illumination optical device is not applied to the second housing. As a result, compared with the case where the optical component housing that houses the illumination optical device and the color separation optical device is integrally formed, the color separation optical device when vibration associated with the driving of the cooling fan, etc. occurs. It is possible to reduce the applied vibration load. In addition, since the image forming apparatus disposed on the light beam exit side of the color separation optical device can be separated from the first housing, the vibration load applied to the image forming apparatus can be reduced. Therefore, the projector can form and project image light with good image quality.

Application Example 2 In the projector according to the application example described above, the holding member includes a support portion that is positioned below the first casing in a stationary state of the projector, and the first casing includes the first casing It is preferable to be held by the support portion.
Here, the stationary state refers to a state where the projector is placed on the floor or a desk.

  According to this projector, the first housing is held by the support portion positioned below when the projector is stationary. Accordingly, for example, the illumination optical device can be supported in a balanced manner as compared with the case where the first housing is held by the holding member disposed on the side by cantilevering. Therefore, when the vibration associated with the driving of the cooling fan or the like occurs, the vibration of the first housing is suppressed, so that it is possible to reduce the vibration load transmitted to the color separation optical device or the image forming apparatus. Become.

  Application Example 3 In the projector according to the application example described above, the illumination optical device includes a first lens array having a plurality of first small lenses that divide a light beam emitted from the light source into a plurality of partial light beams, and the plurality of the plurality of first small lenses. And a second lens array having a plurality of second small lenses respectively corresponding to the first small lenses, wherein the first casing has the support portion in the vicinity of the first lens array and the second lens array. It is preferable that it is fastened.

  According to this projector, since the first housing is fastened to the support portion in the vicinity of the first lens array and the second lens array, the first lens array and the second lens array are strong against the support portion. Can be positioned. This suppresses vibrations of the first lens array and the second lens array when vibration associated with driving of the cooling fan or the like occurs. Therefore, uneven illumination is suppressed and image light with better image quality is suppressed. Can be formed.

  Application Example 4 In the projector according to the application example, it is preferable that the image forming apparatus includes a reflective liquid crystal panel.

  According to this projector, the vibration load on the color separation optical device and the image forming apparatus is reduced, and the image forming apparatus includes the reflective liquid crystal panel, so that it is possible to project high-resolution image light. .

  Application Example 5 In the projector according to the application example described above, it is preferable that the holding member is configured integrally with an exterior housing that forms an exterior of the projector.

  According to this projector, for example, by configuring the holding member integrally with the lower case that forms the lower surface side of the exterior housing in the stationary state, it is possible to reduce the number of parts and improve the production efficiency. It is possible to reduce the cost.

Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects this image light on a screen or the like.
FIG. 1 is a diagram schematically showing a schematic configuration of a projector.
As shown in FIG. 1, the projector 1 includes an optical unit 2, an exterior casing 3 that houses an apparatus main body and constitutes an exterior, a cooling fan 4 that cools the interior of the exterior casing 3, and a control unit that performs various processes on image information And a power supply unit (none of which is shown) for supplying power to the control unit and the like.

The optical unit 2 is a unit that forms and projects image light corresponding to image information by optically processing a light beam emitted from the light source 2111 under the control of the control unit.
The optical unit 2 includes an illumination optical device 210, a superimposing lens 220, a color separation optical device 230, relay lenses 240R and 240B, polarizing plates 250R, 250G and 250B, collimating lenses 260R, 260G and 260B, an image forming device 270, and projection optics. A projection lens 280 as an apparatus, a first housing 5, a second housing 6, and a holding member 7 (see FIG. 2) are provided.

The illumination optical device 210 includes a light source device 211, a first lens array 212, a second lens array 213, and a polarization conversion element 214.
The light source device 211 includes a light source 2111, a reflector 2112, a light source casing 2113, and the like. The light source 2111 is composed of an ultrahigh pressure mercury lamp and emits a light beam. The reflector 2112 has a parabolic mirror, reflects the radial light beam emitted from the light source 2111, and emits it as a substantially parallel light beam to the first lens array 212. The light source casing 2113 accommodates the light source 2111 and the reflector 2112 and is configured to be detachable from the optical unit 2. The light source 2111 is not limited to the ultra-high pressure mercury lamp, and may be a metal halide lamp, for example. The reflector 2112 is not limited to a parabolic mirror, and a configuration in which a collimating concave lens is disposed on the exit surface of the reflector 2112 made of an ellipsoidal mirror may be employed.

The first lens array 212 has a configuration in which a plurality of first small lenses having a substantially rectangular outline when viewed from the optical axis L direction are arranged in a matrix, and a plurality of light beams emitted from the light source 2111 Divide into partial beams.
The second lens array 213 includes a plurality of second small lenses that respectively correspond to the plurality of first small lenses of the first lens array 212, and includes a superimposing lens 220 disposed on the exit side of the polarization conversion element 214, and a part The light beam is substantially superimposed on the surfaces of reflective liquid crystal panels 272R, 272G, and 272B, which will be described later.
The polarization conversion element 214 has a function of aligning a randomly polarized light beam with unidirectionally polarized light, and in this embodiment, aligns it with P-polarized light.

  The color separation optical device 230 has a function of separating the light beam (P-polarized light) emitted from the illumination optical device 210 into three color lights of R light, G light, and B light, and the B dichroic mirror 231. , RG dichroic mirror 232, G dichroic mirror 233, and reflection mirrors 234 and 235.

  The B dichroic mirror 231 is composed of two substantially identical shapes formed in a plate shape, and the RG dichroic mirror 232 is composed of one plate formed in a plate shape. The B dichroic mirror 231 and the RG dichroic mirror 232 are configured to have an X shape in plan view, and each is disposed with an inclination of approximately 45 ° with respect to the optical axis L. Note that the B dichroic mirror 231 may be composed of one sheet and the RG dichroic mirror 232 may be composed of two sheets. Further, each of the B dichroic mirror 231 and the RG dichroic mirror 232 may be composed of two pieces.

  Of the light beam emitted from the illumination optical device 210, the component of B light is reflected by the B dichroic mirror 231 and further reflected by the reflection mirror 234 and transmitted through the relay lens 240B, and then reaches the polarizing plate 250B. On the other hand, the components of the G light and R light in the luminous flux emitted from the illumination optical device 210 are reflected by the RG dichroic mirror 232, further reflected by the reflecting mirror 235 and transmitted through the relay lens 240R, and then the G dichroic mirror. 233. Among them, the G light component is reflected by the G dichroic mirror 233 and reaches the polarizing plate 250G, and the R light component is transmitted through the G dichroic mirror 233 and reaches the polarizing plate 250R.

  The relay lens 240B has a function of efficiently guiding the B light reflected by the reflecting mirror 234 to the reflective liquid crystal panel 272B. Similarly, the relay lens 240R has a function of efficiently guiding the R light reflected by the reflecting mirror 235 to the reflective liquid crystal panel 272R.

  The polarizing plates 250R, 250G, and 250B are attached to the collimating lenses 260R, 260G, and 260B, respectively, and are provided to increase the contrast. The polarizing plates 250R, 250G, and 250B transmit the P-polarized light of each color light emitted from the color separation optical device 230, and absorb the S-polarized light emitted without being aligned by the polarization conversion element 214.

  The collimating lenses 260R, 260G, and 260B are set so that a plurality of partial light beams from the illumination optical device 210 become substantially parallel light beams and illuminate the reflective liquid crystal panels 272R, 272G, and 272B, respectively.

  The image forming apparatus 270 includes polarization selection elements 271R, 271G, and 271B, reflective liquid crystal panels 272R, 272G, and 272B as light modulators, and a cross dichroic prism 273 as a light combining unit.

  The polarization selection element 271R is formed in a plate shape, and is arranged with an inclination of approximately 45 ° with respect to the optical axis of the incident color light. The polarization selecting element 271R has a function of transmitting P-polarized light that is a polarization component in a predetermined direction and reflecting S-polarized light that is a polarization component in a direction orthogonal to the P-polarized light. The polarization selection element 271R transmits the R light (P-polarized light) emitted from the collimating lens 260R, emits the R light to the reflective liquid crystal panel 272R, and out of the R light reflected by the reflective liquid crystal panel 272R, The S-polarized light is reflected and emitted to the cross dichroic prism 273.

  The polarization selection elements 271G and 271B have the same function as the polarization selection element 271R, and transmit and reflect the G light (P-polarized light) and B light (P-polarized light) emitted from the parallelizing lenses 260G and 260B. Of the G light and B light reflected by the reflective liquid crystal panels 272G and 272B, respectively, and S-polarized light is reflected and emitted to the cross dichroic prism 273, respectively. In this embodiment, the illumination optical device 210 emits P-polarized light and the optical components such as the image forming apparatus 270 are configured to correspond to the P-polarized light. However, the illumination optical device 210 is S-polarized. Light may be emitted, and an optical component such as the image forming apparatus 270 may be configured to correspond to the S-polarized light.

  Each of the reflective liquid crystal panels 272R, 272G, and 272B has a structure in which a liquid crystal layer is sandwiched between opposing substrates, and one substrate is provided with reflective pixel electrodes to which switching elements are connected in a matrix. A counter electrode is formed on the other substrate (transparent substrate). Then, a voltage is applied between the reflective pixel electrode and the counter electrode to drive the liquid crystal layer, and R light, G light, and B light transmitted through the polarization selection elements 271R, 271G, and 271B, respectively, according to the image signal. To modulate. The reflective liquid crystal panels 272R, 272G, and 272B are suitable for increasing the resolution because wiring portions and switching elements can be formed below the reflective layer.

  The cross dichroic prism 273 has a substantially square shape in plan view in which four right-angle prisms are bonded, and dielectric multilayer films 2731 and 2732 are provided on the interface where the right-angle prisms are bonded. The dielectric multilayer film 2731 transmits G light and reflects R light, and the dielectric multilayer film 2732 transmits G light and reflects B light. The cross dichroic prism 273 forms image light representing a color image by combining the modulated lights of the respective color lights emitted from the polarization selection elements 271R, 271G, and 271B, and emits the image light to the projection lens 280.

  The projection lens 280 is configured as a combined lens in which a plurality of lenses are combined, and enlarges and projects the image light formed by the image forming apparatus 270 onto a screen or the like.

The first housing 5 houses the illumination optical device 210.
The second housing 6 houses the superimposing lens 220, the color separation optical device 230, the relay lenses 240R and 240B, the polarizing plates 250R, 250G, and 250B and the collimating lenses 260R, 260G, and 260B.
The holding member 7 (see FIG. 2) holds the first housing 5 and the second housing 6 separately.
Each optical component is disposed at a predetermined position with respect to the optical axis L when the first housing 5 and the second housing 6 are held by the holding member 7.

  The cooling fan 4 is disposed in the vicinity of the light source device 211, is disposed at the end of the lamp housing 41 that blows air to the light source 2111, and the outer casing 3 near the light source device 211, and is in the air in the outer casing 3. And an exhaust fan 42 for exhausting the air to the outside.

  The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and functions as a computer, and controls the operation of the projector 1, for example, the projection of image light. The control concerned, the drive voltage control of the cooling fan 4, etc. are performed.

  Although not shown in detail, the power supply unit includes a power supply block and a light source drive block, and supplies power to electronic components such as a control unit and the light source 2111.

Here, the structure of the 1st housing | casing 5, the 2nd housing | casing 6, and the holding member 7 is demonstrated in detail.
2 and 3 are perspective views of the optical unit 2 excluding the projection lens 280. FIG. Specifically, FIG. 2 is a perspective view of the optical unit 2 viewed from the front upper side when the projector 1 is placed on the floor or a desk and placed in a stationary state, and FIG. 3 is a perspective view viewed from the rear upper side. FIG. In the following, for convenience of explanation, the direction in which the light beam is emitted from the light source device 211 is “left” (−X direction), the front is “front” (+ Y direction), and the top is “up” in FIG. "(+ Z direction).

As shown in FIGS. 2 and 3, the optical unit 2 is configured to extend in the left-right direction (± X direction), and the first housing 5 is disposed on the right side (+ X direction). The second housing 6 is disposed in the (−X direction). And the light source device 211 is arrange | positioned at the edge part of the 1st housing | casing 5, and the light source device 211 inject | emits a light beam toward the left direction (-X direction).
The second housing 6 is arranged such that a virtual plane (hereinafter referred to as “separated light plane”) including the optical axes of the respective color lights separated by the color separation optical device 230 is along the vertical plane (YZ plane). Yes. The light beam incident on the second housing 6 from the right direction (+ X direction) is emitted from the front (+ Y direction) of the second housing 6. That is, the second housing 6 is configured such that the separated light plane is substantially perpendicular to the direction of emission of the light beam from the first housing 5. With this configuration, the optical unit 2 can be reduced in size.
The holding member 7 is attached to the first support portion 71 and the first support portion 71 located below the first housing 5 (in the −Z direction), and between the first housing 5 and the second housing 6. It has the 2nd support part 72 located in.
In the image forming apparatus 270, the polarization selection elements 271R, 271G, and 271B, the reflective liquid crystal panels 272R, 272G, and 272B, and the cross dichroic prism 273 are configured as a unit and attached to the projection lens 280 to be attached to the second casing 6. It is arranged in the front (+ Y direction).

The first housing 5 will be described in detail.
FIG. 4 is a perspective view illustrating a state in which the first housing 5 and the second housing 6 are disassembled from the holding member 7, and illustrates a state in which the light source device 211 is removed.
As shown in FIG. 4, the first housing 5 is formed in a box shape with a high heat-resistant material such as BMC (Bulk Molding Compound) and has a container-like lower case 51 constituting the lower side (−Z direction); A lid-like upper case 52 constituting the upper side (+ Z direction). The lower case 51 and the upper case 52 are not limited to BMC, and may be other high heat resistant materials such as synthetic resin containing glass fiber.

FIG. 5 is a perspective view showing the lower case 51 and the optical components housed in the lower case 51, as viewed from the upper left front side in the posture in which the first housing 5 is held by the holding member 7.
As shown in FIGS. 4 and 5, the lower case 51 is formed in a container shape whose upper side (+ Z direction) is an opening, and a side wall 513 is provided at a substantially central portion thereof, and the right side (+ X direction) and Concave portions 511 and 512 are formed on the left side (−X direction). An opening 514 is formed in the side wall 513.

  An opening 516 is formed in the left side wall 515 of the recess 512, and a plurality of grooves are provided on the inner wall surface of the recess 512 along the vertical direction. Ribs projecting in the opposite direction to the recesses 512 are formed at the lower portions of the front and back side walls of the recesses 512, that is, outside the first lens array 212 and the second lens array 213. The ribs are provided with holes 517 through which screws for attaching the first housing 5 to the holding member 7 are inserted (the ribs and holes 517 on the rear side are not shown). A plurality of screw holes 518 for attaching the upper case 52 are provided on the upper surface of the side wall forming the recess 512.

  The light source device 211 is detachably attached to the recess 511, and the first lens array 212, the second lens array 213, and the polarization conversion element 214 are inserted into grooves on the inner wall surface of the recess 512. Built into the lower case 51.

  As shown in FIGS. 4 and 5, the upper case 52 is formed so as to close the recess 512 of the lower case 51, and a screw SC is inserted near the outer periphery at a position corresponding to the screw hole 518 of the lower case 51. Holes are formed. The upper case 52 is attached to the lower case 51 with screws SC and covers the first lens array 212, the second lens array 213, and the polarization conversion element 214.

  As shown in FIGS. 4 and 5, the light beam emitted from the light source device 211 passes through the opening portion 514 and enters the concave portion 512, passes through the optical components such as the first lens array 212, and the like from the opening portion 516. The light is emitted to the superimposing lens 220.

Next, the second housing 6 will be described in detail.
The second housing 6 is made of synthetic resin, and as shown in FIGS. 3 and 4, is formed in a box shape in which the upper part and the lower part on the front side (+ Y direction) protrude and constitute the right side (+ X direction). It has a container-like right case 61 and a lid-like left case 62 constituting the left side (−X direction).

FIG. 6 is a perspective view showing the right case 61 and the optical components housed in the right case 61, and is a view seen from the rear left side in the posture in which the second housing 6 is held by the holding member 7.
As shown in FIG. 6, the right case 61 is formed in a container shape having an opening on the left side (−X direction), and a plurality of grooves are provided on the inner wall surface along the left and right direction (± X direction). It has been. A plurality of screw holes 615 for attaching the left case 62 to the left end (-X direction) end surface are provided at substantially equal intervals.

As shown in FIG. 4, a rectangular through hole 612 is formed on the right side (+ X direction) side wall 611 of the right case 61, and the second housing 6 is held outside the through hole 612 of the side wall 611. A plurality of holes 614 through which screws for attachment to the member 7 are inserted are formed.
On the protruding side wall of the right case 61 on the front side (+ Y direction), rectangular through holes 613R and 613B are formed in the upper part (+ Z direction) and the lower part (−Z direction), respectively. A through hole 613G is formed on a side wall adjacent to the side wall in which the through hole 613R is formed (see FIG. 6).

As shown in FIG. 4, the superimposing lens 220 is disposed inside the side wall 611, and is attached by a not-shown protrusion provided on the right case 61 and a leaf spring SP.
As shown in FIG. 6, the B dichroic mirror 231 and the RG dichroic mirror 232 are held by the holder unit 20 so as to be substantially orthogonal to each other, and are substantially in the center of the rear (−Y direction) of the right case 61, that is, a superposition lens. 220 is arranged on the light emission side.

FIG. 7 is a perspective view showing the B dichroic mirror 231, the RG dichroic mirror 232, and the holder unit 20, and is a view of the state attached to the right case 61 as seen from the rear left side.
As shown in FIG. 7, the holder unit 20 fixes the holder main body 200 for positioning the B dichroic mirror 231 and the RG dichroic mirror 232, and the B dichroic mirror 231 and the RG dichroic mirror 232 to the holder main body 200. For this reason, it has a plurality of leaf springs SP.

  The holder body 200 is made of a synthetic resin, and includes a base portion 201 and a guide portion 202 for positioning the B dichroic mirror 231 and the RG dichroic mirror 232 in the width direction, and between the base portion 201 and the guide portion 202. The B-dichroic mirror 231 and the RG dichroic mirror 232 are bridged and have plate-like portions 204 and 203 that are substantially orthogonal to each other for positioning the angle.

  At the right (+ X direction) end of the base part 201 and the guide part 202, a protruding part that protrudes on the opposite side to the plate-like part 203 is provided, and the holder unit 20 is attached to the right case 61 at the protruding part. A hole 205 through which a screw for attachment is inserted is formed (the protruding portion of the guide portion 202 and the hole 205 are not shown). Further, the base portion 201 and the guide portion 202 are provided with a plurality of holes for attaching the leaf spring SP.

The surface of the RG dichroic mirror 232 opposite to the surface on which the light beam enters is in contact with the plate-like portion 203, and the edge portion is clamped by the plate spring SP and fixed to the holder body 200.
The two B dichroic mirrors 231 are arranged such that their end faces face each other via the RG dichroic mirror 232. One B dichroic mirror 231 is in contact with the plate-like portion 204 on the surface opposite to the surface on which the light beam is incident, and is fixed to the holder main body 200 with the edge held between the plate springs SP. The edge of the mirror 231 comes into contact with a projection (not shown) provided on the holder body 200 and is clamped by the leaf spring SP to be fixed to the holder body 200.
The B dichroic mirror 231, the RG dichroic mirror 232, and the holder unit 20 are fixed to the right case 61 by inserting screws through the holes 205.

  As shown in FIG. 6, the reflecting mirrors 234 and 235, the G dichroic mirror 233, the relay lenses 240R and 240B, the polarizing plates 250R, 250G, and 250B and the parallel lenses 260R, 260G, and 260B are arranged at the side ends of the right case 61. It is inserted into the groove on the inner wall surface and incorporated into the right case 61 (the polarizing plate 250G and the collimating lens 260G are not shown).

  The reflection mirrors 234 and 235 have surfaces 2341 and 2351 whose corners on the B dichroic mirror 231 and RG dichroic mirror 232 sides are chamfered, respectively, and are close to the B dichroic mirror 231 and the RG dichroic mirror 232. Are arranged. Accordingly, the optical unit 2 is configured so that the dimension in the vertical direction (± Z direction) is reduced.

  As shown in FIG. 3, the left case 62 is formed so as to close the opening of the right case 61, and in the vicinity of the outer periphery, a hole through which the screw SC is inserted at a position corresponding to the screw hole 615 of the right case 61. Is formed. The left case 62 is attached to the right case 61 with screws SC.

As shown in FIGS. 4 and 6, the light beam emitted from the illumination optical device 210 enters the superimposing lens 220 through the through-hole 612, and the B dichroic mirror 231 and the RG dichroic mirror 232 are emitted from the superimposing lens 220. The luminous flux is separated into each color light and reflected in the vertical direction (± Z direction). Further, after being separated into light of each color by the G dichroic mirror 233, the light passes through the collimating lenses 260R, 260G, and 260B and is emitted from the through holes 613R, 613G, and 613B to the image forming apparatus 270.
As described above, the superimposing lens 220, the color separation optical device 230, the relay lenses 240R and 240B, the polarizing plates 250R, 250G, and 250B and the collimating lenses 260R, 260G, and 260B are arranged so that the separated light plane is along the YZ plane. Arranged in the second housing 6.

Next, the holding member 7 will be described in detail.
As described above, the holding member 7 includes the first support portion 71 and the second support portion 72.
As shown in FIG. 4, the first support portion 71 is formed in a rectangular parallelepiped shape with a metal, high-stiffness synthetic resin, or the like, and protrudes upward on the upper surface thereof for attaching the first housing 5. A plurality of bosses 711 are provided. A screw hole 712 is formed in the boss 711, and the screw hole 712 is provided at a position corresponding to the hole 517 of the lower case 51.

The second support portion 72 is formed of sheet metal and is bent into an L shape that is substantially perpendicular, and includes a vertical portion 721 that constitutes one piece and a horizontal portion 722 that constitutes the other piece. ing.
The vertical portion 721 has an L-shaped concave surface 721A and a surface 721B on the opposite side, and a rectangular transparent portion through which a light beam emitted from the illumination optical device 210 passes is provided at a substantially central portion. A hole 7211 is formed. A plurality of screw holes 7212 corresponding to the holes 614 of the right case 61 for attaching the second housing 6 are formed outside the through holes 7211.
The second support portion 72 is processed so as to increase rigidity by bending a bent portion and bending an end portion of the vertical portion 721. Note that the second support portion 72 is not limited to sheet metal, and may be formed of other highly rigid materials.

  As shown in FIGS. 2 and 4, the second support portion 72 has an outer surface of the horizontal portion 722 in contact with the upper surface of the first support portion 71, and the vertical portion 721 is upward with respect to the upper surface of the first support portion 71. Are attached to the first support portion 71 by a plurality of screws SC.

The first housing 5 is attached to the first support portion 71 by inserting a screw SC through the hole 517 with the side wall 515 (see FIG. 5) facing the surface 721A. That is, in the first housing 5, the vicinity of the first lens array 212 and the second lens array 213 is fastened to the first support portion 71.
In the second housing 6, the side wall 611 is in contact with the surface 721 </ b> B of the vertical portion 721, and a screw (not shown) is inserted into the hole 614 and attached to the second support portion 72.
In this way, the first housing 5 is held by the first support portion 71, and the second housing 6 is held by the second support portion 72, and is separated and held by the holding member 7.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) According to the projector 1 of the present embodiment, the weight load of the illumination optical device 210 is not applied to the second housing 6. As a result, the color separation optical device 230 and the image forming device 270 when vibration associated with the driving of the cooling fan 4 occurs compared to the case where the optical component housing that houses the optical components is integrally configured. It is possible to reduce the vibration load applied to the components. Therefore, the projector 1 can form and project image light with good image quality.

  (2) According to the projector 1 of the present embodiment, the first housing 5 is held by the first support portion 71 disposed below when the projector 1 is stationary. Accordingly, for example, the illumination optical device 210 can be supported in a balanced manner as compared with a case where the first housing 5 is held by the holding member disposed on the side by cantilevering. Therefore, when the vibration associated with the driving of the cooling fan 4 or the like occurs, the vibration of the first housing 5 is suppressed, so that the vibration load transmitted to the color separation optical device 230, the image forming apparatus 270, and the like is reduced. It becomes possible.

  (3) According to the projector 1 of the present embodiment, since the first housing 5 is fastened to the first support portion 71 in the vicinity of the first lens array 212 and the second lens array 213, the first lens array 212 and the second lens array 213 can be firmly positioned with respect to the first support portion 71. This suppresses vibration of the first lens array 212 and the second lens array 213 when vibration associated with driving of the cooling fan 4 or the like occurs, thereby suppressing uneven illumination and further improving image quality. It is possible to project an image light.

  (4) According to the projector 1 of the present embodiment, since the image forming apparatus 270 includes the reflective liquid crystal panels 272R, 272G, and 272B, it is possible to project image light with high resolution.

  (5) According to the projector 1 of the present embodiment, since only the first casing 5 or only the second casing 6 can be easily replaced, for example, the first casing 5 when damaged by heat, for example. It becomes possible to exchange only the service, etc., and after-sales service correspondence becomes easy. In addition, it is possible to reduce the cost of replacement parts in after-sales service.

(6) According to the projector 1 of the present embodiment, since the first housing 5 and the second housing 6 can be formed of different materials, materials corresponding to the respective functions can be selected. At the same time, low costs can be achieved.
Further, since the first housing 5 and the second housing 6 can increase the rigidity without increasing the weight as compared with the case where they are integrally configured, it is possible to reduce the weight.

  (7) According to the projector 1 of the present embodiment, since only the first housing 5 or only the second housing 6 can be easily replaced, it is possible to change product specifications, for example, only the illumination optical device 210 or color separation. It becomes possible to easily change the specifications of only the optical device 230.

(Modification)
In addition, you may change the said embodiment as follows.
The second housing 6 may be configured to store the image forming apparatus 270, and may be configured to store at least the color separation optical apparatus 230 of the color separation optical apparatus 230 and the image forming apparatus 270.

  The superimposing lens 220 of the embodiment is housed in the second housing 6, but may be configured to be housed in the first housing 5.

  In the holding member 7 of the above embodiment, the first support portion 71 and the second support portion 72 are configured separately, but may be configured integrally.

  The holding member 7 according to the embodiment may be configured integrally with the outer casing 3, for example, the lower case that forms the lower surface side in the stationary state. Moreover, you may comprise only the 1st support part 71 integrally with a lower case. As a result, the number of parts can be reduced, and the production efficiency can be improved and the cost can be reduced.

  The projector 1 of the embodiment uses the reflective liquid crystal panels 272R, 272G, and 272B as the light modulation device, but may use a transmissive liquid crystal panel.

  Although the projector 1 of the embodiment is applied as the front type projector 1, it can also be applied to a rear type projector that integrally has a screen as a projection target surface.

The figure which shows typically schematic structure of a projector. The perspective view which looked at the optical unit from the front upper side. The perspective view which looked at the optical unit from back upper side. The perspective view which shows the state which decomposed | disassembled the 1st housing | casing and the 2nd housing | casing from the holding member. The perspective view which shows the optical component accommodated in a lower case and a lower case. The perspective view which shows the optical component accommodated in a right case and a right case. The perspective view which shows B dichroic mirror, RG dichroic mirror, and a holder unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Optical unit, 3 ... Exterior housing, 4 ... Cooling fan, 5 ... 1st housing | casing, 6 ... 2nd housing | casing, 7 ... Holding member, 51 ... Lower case, 52 ... Upper case, 61 ... right case, 62 ... left case, 71 ... first support, 72 ... second support, 210 ... illumination optical device, 211 ... light source device, 212 ... first lens array, 213 ... second lens array, 230 ... Color separation optical device, 270, image forming device, 272R, 272G, 272B, reflective liquid crystal panel, 273, cross dichroic prism, 280, projection lens, 2111, light source.

Claims (5)

An illumination optical device having a light source, a color separation optical device that separates a light beam emitted from the illumination optical device into a plurality of color lights, and a plurality of the color lights are modulated and synthesized according to image information to form image light A projector equipped with an image forming apparatus that
A first housing that houses the illumination optical device;
A second housing that houses at least the color separation optical device;
A holding member for holding the first housing and the second housing;
With
The projector, wherein the first casing and the second casing are separated and held by the holding member. The projector according to claim 1,
The holding member has a support portion located below the first housing in the stationary state of the projector,
The projector according to claim 1, wherein the first casing is held by the support portion. The projector according to claim 2,
The illumination optical device comprises:
A first lens array having a plurality of first small lenses for dividing a light beam emitted from the light source into a plurality of partial light beams;
A second lens array having a plurality of second small lenses respectively corresponding to the plurality of first small lenses;
With
The projector, wherein the first casing is fastened to the support portion in the vicinity of the first lens array and the second lens array. The projector according to any one of claims 1 to 3,
The image forming apparatus includes a reflective liquid crystal panel. The projector according to any one of claims 1 to 4, wherein
The projector according to claim 1, wherein the holding member is integrally formed with an exterior casing constituting an exterior of the projector.

Images