JP2019020561A - Projector and method for wiring projector - Google Patents

Abstract

To provide a projector manufacture of which can be simplified to reduce manufacturing cost.SOLUTION: A projector 1 comprises: a main substrate that outputs video signals; three liquid crystal panels; a liquid crystal substrate 22 that receives input of the video signals to generate driving signals; three flexible substrates 220R that supply the driving signals to the liquid crystal panels; a circulation box 260 that accommodates the liquid crystal panels, flexible substrates 220R, and liquid crystal substrate 22 and is formed with a hole 20; a cooling mechanism that circulates cooling air 21; and a connection member that supplies the video signals output from the main substrate to the liquid crystal substrate 22. The main substrate is provided outside the circulation box 260; the connection member is inserted into the hole 20 of the circulation box 260; the gap between the connection member and hole is sealed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a projector and a projector wiring method.

  Many components such as a light source, an optical engine, a lens, an electronic board, and a power source are used in the projector. Among these components, the liquid crystal panel included in the light source and the optical engine is a heat-generating component that generates heat during operation, and the heat-generating component may be damaged due to a high temperature. For this reason, in order to prevent breakage due to high temperature, an allowable temperature is set for each heat generating component. It is necessary to cool the inside of the projector when the projector is used so that the heat generating component does not exceed the allowable temperature.

  As a method of cooling the heat generating component, there is a method of lowering the temperature by applying external air introduced from the outside of the projector to the heat generating component. However, in this method, dust such as dust or dust floating in the air may move on the wind and adhere to the heat-generating component. If dust adheres to the surface of the liquid crystal panel, among the heat generating components, the liquid crystal pixels may be blocked. When an image is projected in this state, dust is projected as a shadow as it is. In particular, when the pixel size of the liquid crystal is small, the shadow of dust is conspicuous in the projected image, so that the quality of the projected image is deteriorated.

  According to the description in Patent Document 1, a cooling device is arranged inside a projector, and the cooling device is used to cool the liquid crystal panel while preventing dust from adhering to the surface of the liquid crystal panel.

  The cooling device described in Patent Document 1 includes a partition, a fan, and a heat dissipation mechanism. A sealed space is formed inside the partition wall of the cooling device. As the heat dissipation mechanism, a heat transfer conversion element that moves the heat inside the partition to the outside of the partition is used. Inside the sealed space, a heat dissipation mechanism, a fan, and a liquid crystal panel to be cooled are arranged. The fan generates a wind circulating inside the sealed space. The liquid crystal panel to be cooled is cooled by receiving the circulating wind.

JP-A-2005-121250

  According to the description in Patent Literature 1, an optical unit that is a cooling target is disposed inside the sealed space.

  The optical unit includes three liquid crystal panels. The three liquid crystal panels are optical components that produce a single color (red, green, blue) image in response to a drive signal input from the outside of the projector. The three images are combined by a cross dichroic prism to form one color image. One color image is projected onto a screen via a projection lens.

  Here, each liquid crystal panel is connected via a flexible substrate and a main substrate that supplies a drive signal. The main board is provided outside the sealed space. For this reason, the flexible board needs to penetrate a partition wall that covers the sealed space. Since there are a plurality of flexible substrates, a plurality of holes through which the flexible substrate is inserted are formed in the partition wall. For this reason, in order to make the inside of the partition wall a sealed space, it is necessary to seal a plurality of holes formed in the partition wall with a sealing material after wiring of the flexible substrate, which takes time and is expensive to manufacture. It was.

  The present invention provides a projector capable of simplifying manufacturing and suppressing manufacturing cost.

  The projector according to the present invention includes a main board for outputting a video signal, first to third liquid crystal panels, and a first for inputting the video signal and driving the first to third liquid crystal panels. A liquid crystal substrate for generating third to third driving signals; first to third flexible substrates for supplying the first to third driving signals generated by the liquid crystal substrate to the first to third liquid crystal panels; A cooling box that hermetically accommodates the first to third liquid crystal panels, the first to third flexible substrates, and the liquid crystal substrate; and cooling that circulates cooling air in the circulation box. A mechanism, a connection member for supplying the video signal output from the main board to the liquid crystal board, and a hole formed in the circulation box, Provided outside the serial circulation box, the said hole of the circulation box is inserted the connecting member, the sealing member for sealing between the connecting member and the hole is provided.

  A projector wiring method according to the present invention is a projector wiring method performed by a projector including a main substrate that outputs a video signal and first to third liquid crystal panels, and inputs the video signal, A liquid crystal substrate that generates first to third drive signals for driving the first to third liquid crystal panels is provided, and the first to third drive signals generated by the liquid crystal substrate are first to third. Supplying to the first to third liquid crystal panels by a third flexible substrate, housing the first to third liquid crystal panels, the first to third flexible substrates, and the liquid crystal substrate in a circulation box, cooling Cooling air is circulated in the circulation box by a mechanism, and the video signal output from the main substrate is supplied to the liquid crystal substrate by a connection member, and the circulation is performed. Forming a box hole, connecting the liquid crystal substrate and the main substrate provided outside the circulation box with the connecting member through the hole, and sealing between the hole and the connecting member with a sealing material It is characterized by.

  With the above configuration, the present invention provides a projector capable of simplifying manufacturing and suppressing manufacturing cost.

It is a perspective view which shows the inside of the projector which concerns on this invention. It is a perspective view which shows the inside of the circulation box shown in FIG. It is a figure which shows the structure of the optical unit accommodated in the inside of the circulation box in FIG. It is the figure which showed the structure of the connection part of a main board | substrate and an optical unit. It is sectional drawing which shows the structure of the principal part when a circulation box is seen from the arrow A direction in FIG. It is a figure which shows the structure of the light source unit shown in FIG. FIG. 2 is an enlarged sectional view in which a portion of a projection lens 3 shown in FIG. 1 is enlarged.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below do not limit the present invention. The present invention can be arbitrarily changed within the scope of the technical idea.

[Overall configuration of projector]
FIG. 1 is a perspective view showing an embodiment of a projector 1 according to the present invention, and shows a state in which an upper lid is removed.

  The projector 1 includes a projection lens 3, a main substrate 4, a light source unit 5, an axial fan 6, a bottom side frame 11, a circulation box 260, and a heat dissipation heat sink 271.

  The bottom side frame 11 mounts each of the above parts. In the circulation box 260, there is provided an optical unit 28 that generates image light indicated by a video signal supplied from the main board 4 by illumination light obtained from the light source unit 5, and the projection lens 3 is provided with the image. Project light. The heat radiating heat sink 271 is attached to the circulation box 260, and the axial fan 6 sends air to the heat radiating fins provided in the heat radiating heat sink 271 and the light source unit 5. The main board 4 is disposed outside the circulation box 260.

  FIG. 2 is a perspective view showing the inside of the circulation box 260 shown in FIG.

  In addition to the components shown in FIG. 1, the projector 1 further includes a cooling fan 23, a blower duct 25, an optical unit 28, a heat receiving heat sink 270, a heat pipe 272, a board-to-board connector 41, and the liquid crystal substrate 22.

  The circulation box 260 hermetically houses the cooling fan 23, the air duct 25, the optical unit 28, the heat receiving heat sink 270, and the liquid crystal substrate 22 inside.

  The cooling fan 23 generates wind that circulates inside the circulation box 260.

  The air duct 25 guides the wind generated by the cooling fan 23 to the optical unit 28 inside the circulation box 260.

  The optical unit 28 modulates the light supplied from the light source unit 5 into a color image. Thereafter, the optical unit 28 emits a color image to the projection lens 3.

  The heat receiving heat sink 270 is provided to cool the gas inside the circulation box 260 that flows in contact with the heat receiving heat sink 270.

  The board-to-board connector 41 connects the liquid crystal substrate 22 inside the circulation box 260 and the main substrate 4 outside the circulation box 260. The board-to-board connector 41 transmits the video signal from the main board 4 to the liquid crystal board 22.

  The liquid crystal substrate 22 receives a video signal from the board-to-board connector 41 and performs processing described later. The liquid crystal substrate 22 transmits information for forming a color image to be projected onto the screen to the optical unit 28 via first to third flexible substrates 220R, 220G, and 220B (not shown) described later.

  Processing performed on the liquid crystal substrate 22 will be described. The video signal sent from the main board 4 includes red (R), green (G), and blue (B) video signals. In the liquid crystal substrate 22, the video signals from the main substrate 4 are red (R), green (G), and blue (B) drive signals, which are transmitted to the optical unit 28 via the flexible substrates 220R, 220G, and 220B.

  The heat pipe 272 is provided so as to penetrate both the heat receiving heat sink 270 provided inside the circulation box 260 and the heat radiation heat sink 271 provided outside the circulation box 260, and connects the heat reception heat sink 270 and the heat radiation heat sink 271. At the same time, the heat of the heat receiving heat sink 270 is transmitted to the heat radiating heat sink 271.

  The cooling fan 23, the heat receiving heat sink 270, the heat radiating heat sink 271 and the heat pipe 272 constitute a cooling mechanism of the circulation box 260.

[Configuration of optical unit]
The optical system among the components shown in each figure will be described with reference to FIG. FIG. 3 is a diagram showing the configuration of the optical unit 28 arranged inside the circulation box 260 in FIG.

  The optical unit 28 includes a first lens array 281, a second lens array 282, a polarization conversion element 283, a lens 284, dichroic mirrors 285 and 286, reflection mirrors 287 288 and 289, relay lenses 290 and 291, first to third. Liquid crystal panels 280R, 280G, 280B, and a cross dichroic prism 292.

  The first lens array 281 includes a plurality of small lenses, and divides the light incident on the optical unit 28 into a plurality of partial light beams. The second lens array 282, together with the lens 284, forms an image of the first lens array 281 in the vicinity of the image forming areas of the liquid crystal panels 280R, 280G, and 280B.

  The polarization conversion element 283 converts the light beam from the second lens array 282 into linearly polarized light. The lens 284 collects the partial light beams from the polarization conversion element 283 and superimposes them in the vicinity of the image forming areas of the liquid crystal panels 280R, 280G, and 280B.

  The first lens array 281, the second lens array 282, the polarization conversion element 283, and the lens 284 make the in-plane light intensity distribution of the light from the light source unit 5 uniform.

  The dichroic mirror 285 transmits the green light component and the blue light component and reflects the red light component. The dichroic mirror 286 reflects the green light component toward the liquid crystal panel 280G and transmits the blue light component.

  The reflection mirror 287 reflects the red light component. The reflection mirrors 288 and 289 reflect the blue light component.

  The light emitted from the light source unit 5 described above enters the optical unit 28 from the right side of the first lens array 281 in FIG.

  The red light reflected by the dichroic mirror 285 is reflected again by the reflection mirror 287, and enters the image forming area of the liquid crystal panel 280R for red light.

  The green light that has passed through the dichroic mirror 285 is reflected by the subsequent dichroic mirror 286 and enters the image forming area of the liquid crystal panel 280G for green light.

  The blue light that has passed through the dichroic mirror 285 and the dichroic mirror 286 passes through the relay lens 290, the reflection mirror 288, the relay lens 291, and the reflection mirror 289 and enters the image forming area of the blue light liquid crystal panel 280 </ b> B. Note that the relay lenses 290 and 291 are arranged only to adjust the difference because only the optical path of blue light is longer than that of red light and green light.

  The liquid crystal panel 280R modulates incident red light according to image information input from the liquid crystal substrate 22 to form a red single color image. Similarly, the liquid crystal panel 280G modulates the incident green light in accordance with the image information input from the liquid crystal substrate 22 to form a green single color image. The liquid crystal panel 280B modulates incident blue light according to image information input from the liquid crystal substrate 22 to form a blue single-color image.

  The cross dichroic prism 292 combines the single color images emitted from the liquid crystal panels 280R, 280G, and 280B to form a color image. The formed color image is emitted from the cross dichroic prism 292 and further emitted from the optical unit 28. The color image emitted from the optical unit 28 is enlarged and projected by the projection lens 3 to form an image on the screen (see FIG. 2).

[Configuration of the connection between the liquid crystal substrate and the optical unit]
FIG. 4 is a diagram illustrating a configuration of a connection portion between the main substrate 4 and the optical unit 28.

  As shown in FIG. 4, the main substrate 4 is connected to the liquid crystal substrate 22 via a board-to-board connector 41. On one side of the liquid crystal substrate 22 in the vicinity of the optical unit 28, a cutout portion 221 cut out from the end portion toward the inner surface of the substrate is formed. One end of each flexible substrate 220R, 220G, 220B is connected to the substrate surface of the liquid crystal substrate 22 and in the vicinity of the end surface of the notch 441. The other ends of the flexible substrates 220R, 220G, and 220B are connected to the corresponding liquid crystal panels 280R, 280G, and 280B, respectively.

  The main board 4 receives a signal from an external device and outputs video signals for driving the liquid crystal panels 280R, 280G, and 280B to the liquid crystal board 22 via the board-to-board connector 41.

  The liquid crystal substrate 22 receives the video signal from the board-to-board connector 41, performs the above-described processing, and drives information for forming a color image to be projected onto the screen, that is, the liquid crystal panels 280R, 280G, and 280B, respectively. The drive signal is transmitted to the liquid crystal panels 280R, 280G, 280B of the optical unit 28 through the flexible substrates 220R, 220G, 220B.

  Based on the information for forming a color image, the liquid crystal panel 280R forms a red single color image, the liquid crystal panel 280G forms a green single color image, and the liquid crystal panel 280B forms a blue single color image.

[Internal configuration of circulation box]
FIG. 5 is a cross-sectional view showing the configuration of the main part when the circulation box 260 is viewed from the direction of arrow A in FIG.

  As shown in FIG. 5, a circulation box lid 261 is attached to the circulation box 260 via a lid sealing material 263.

  The circulation box 260 is made of aluminum.

  The circulation box lid 261 closes the upper opening of the circulation box 260. The circulation box lid 261 is made of aluminum. The circulation box lid 261 has one hole 20 through which the board-to-board connector 41 is inserted. The gap between the hole 20 and the board-to-board connector 41 is sealed with the sealing material 7. As the sealing material 7, any sealing member such as a putty for filling a gap or an elastic body can be used.

  Further, a lid sealing material 263 is provided on the joint surface between the circulation box lid 261 and the circulation box 260. The lid sealing material 263 is made of rubber, sponge, soft metal such as copper, or the like.

  When the circulation box lid 261 is fixed to the circulation box 260 and the hole 20 is sealed with the sealing material 7, the space surrounded by the circulation box 260 and the circulation box lid 261 is sealed.

  A flow path from the optical unit 28 to the heat receiving heat sink 270 is referred to as a circulation duct 24.

  The cooling fan 23 generates the cooling air 21 that circulates inside the circulation box 260.

  As shown in FIG. 2, the optical unit 28 is provided in the vicinity of the center from the projection light exit surface of the circulation box 260.

  The air duct 25 is provided between the cooling fan 23 and the optical unit 28 and blows the cooling air 21 toward the optical unit 28.

  The liquid crystal substrate 22 is disposed between the circulation box lid 261 and the optical unit 28 in FIG. The liquid crystal substrate 22 generates heat when energized.

  The heat receiving heat sink 270 is disposed between the liquid crystal substrate 22 and the cooling fan 23.

[Flow of cooling air]
The flow of the cooling air 21 sent out by the cooling fan 23 will be described.

  The cooling air 21 sent out from the cooling fan 23 returns to the cooling fan 23 through the air duct 25, the optical unit 28, the liquid crystal substrate 22, and the heat receiving heat sink 270 in order. As the cooling air 21 passes through each part, each part is cooled. When the cooling air 21 passes through the liquid crystal substrate 22, a notch 221 (see FIG. 4) is provided, so that a part of the cooling air 21 flows through the notch 221, and a part of the cooling air 21 is The current is diverted to the upper surface side (circulation box lid 261 side) of the liquid crystal substrate 22. Further, the remainder of the cooling air 21 flows on the lower surface side of the liquid crystal substrate 22. That is, the cooling air 21 flows while contacting both surfaces of the liquid crystal substrate 22. When the cooling air 21 flows in contact with the optical unit 28 and the liquid crystal substrate 22, the cooling air 21 receives heat from the optical unit 28 and the liquid crystal substrate 22 and becomes high temperature. That is, the optical unit 28 and the liquid crystal substrate 22 are cooled because they receive heat from the cooling air 21.

  The cooling air 21 that has reached a high temperature passes through the heat receiving heat sink 270. The heat receiving heat sink 270 is connected to the heat radiating heat sink 271 outside the circulation box 260 via the heat pipe 272 (see FIG. 2). When the temperature of the heat receiving heat sink 270 is increased by receiving heat from the cooling air 21, the heat receiving heat sink 270 has a higher temperature than the heat dissipation heat sink 271. When a temperature difference occurs between the heat receiving heat sink 270 and the heat radiating heat sink 271, the heat of the high temperature side heat receiving heat sink 270 moves to the low temperature side heat radiating heat sink 271 via the heat pipe 272. Here, since the heat radiating heat sink 271 is cooled by the axial fan 6, the moving heat is released into the atmosphere outside the circulation box 260 (see FIG. 1). That is, since the heat sink 271 is cooled by the axial fan 6, the cooling air 21 passing through the heat receiving heat sink 270 is indirectly cooled.

[Configuration of light source unit]
A light source unit 5 is used as the light source of the projector 1. FIG. 6 is a diagram showing an optical system of the light source unit 5 shown in FIG.

  The light source unit 5 includes a first solid light source 501, an integrator lens 502, a collimator condensing optical system 503, a dichroic mirror 504, a collimating condensing optical system 505, a rotating fluorescent plate 506, a motor 507, a second solid light source 508, an integrator lens 509 and A collimating optical system 510 is provided.

  The first solid-state light source 501 and the second solid-state light source 508 are constituted by a plurality of semiconductor lasers that emit blue light, and are arranged so that the emission surfaces of the respective semiconductor lasers form a straight line. Light emitted from each light source is made uniform by the integrator lenses 502 and 509 and enters the dichroic mirror 504 through the collimator condensing optical systems 503 and 510.

  The dichroic mirror 504 reflects blue wavelength light and transmits yellow light. The light of the first solid-state light source 501 incident on the dichroic mirror 504 is directed to the rotating fluorescent plate 506 provided in the right direction of the drawing, and is dichroic. The light of the second solid-state light source 508 that has entered the mirror 504 is directed leftward in the drawing.

  The light of the first solid-state light source 501 reflected by the dichroic mirror 504 is irradiated on the rotating fluorescent plate 506 through the collimator condensing optical system 505. The rotating fluorescent plate 506 has a phosphor formed on the surface irradiated with the light of the first solid light source 501, and the fluorescent material on the rotating fluorescent plate 506 irradiated with the light of the first solid light source 501 is excited and yellow. Generates fluorescence. The yellow light passes through the collimator condensing optical system 505 and the dichroic mirror 504 and goes to the left in the drawing.

[Configuration of projection lens section]
FIG. 7 is an enlarged cross-sectional view in which the portion of the projection lens 3 shown in FIG. 1 is enlarged.

  The lens base 30 is attached to a wall surface of the circulation box 260 at a position where light emitted from the cross dichroic prism 292 is emitted from the circulation box 260. The lens base 30 includes a fixing unit 31, a dustproof glass 32, and a driving unit 33.

  The fixed part 31 has a cylindrical protrusion and a flange-shaped collar formed around the protrusion. In the circulation box 260, an opening corresponding to the protrusion of the fixing part 31 is formed. As shown in the drawing, the protrusion of the fixing part 31 is inserted into the opening of the circulation box 260. 31 is integrated. The opening of the circulation box 260 and the protruding portion of the fixing portion 31 may be integrated by screwing.

  The end opening of the protruding portion of the fixed portion 31 is closed by the dust-proof glass 32, whereby the airtightness in the circulation box 260 is maintained.

  The drive unit 33 has a cylindrical shape, one end surface of which is in contact with the flange-side surface of the fixed unit 31, and is attached to the fixed unit 31 so that the cavity of the drive unit 33 overlaps the cavity of the fixed unit 31. It is done. The drive unit 33 is provided to realize a lens shift mechanism. An X-Y table (not shown) that can move the projection lens 3 in a direction perpendicular to the optical axis 36 of the light emitted from the cross dichroic prism 292 is provided on the other end face of the drive unit 33. The central axis 35 of the projection lens 3 and the optical axis 36 can be driven while being kept parallel.

  The projection lens 3 is held by the drive unit 33 and is disposed at a position where outgoing light can enter from the cross dichroic prism 292.

[First effect of this embodiment]
In the present embodiment, the liquid crystal substrate 22 is divided from the main substrate 4, and the liquid crystal substrate 22 is disposed inside the circulation box 260 (see FIG. 5). Thus, to make the inside of the circulation box 260 a sealed space, it is only necessary to seal the single hole 20 for the board-to-board connector 41 with the sealing material 7. That is, in the present embodiment, the seals that have conventionally been in three places can be omitted in one place, and the production can be simplified and the production cost can be reduced.

  Further, in this embodiment, it is not necessary to seal the portions of the flexible substrates 220R, 220G, and 220B with the sealing material 7. For this reason, the sealing force is not applied to the flexible substrates 220R, 220G, and 220B, the force is applied to the liquid crystal panels 280R, 280G, and 280B connected to the flexible substrates 220R, 220G, and 220B, and the projected image is blurred. There is no end to it.

[Second effect of this embodiment]
The second effect is that the board-to-board connector 41 is used as the connection member for connecting the main substrate 4 and the liquid crystal substrate 22 (see FIG. 5).

  A board-to-board connector 41 is inserted through the hole 20 formed in the circulation box lid 261, and a part of the hole 20 is sealed with a sealing material 7.

  If the connection between the main substrate 4 and the liquid crystal substrate 22 is performed using a cable with low rigidity, the workability may be impaired because the cable is bent during the sealing operation. However, since the board-to-board connector 41 is made of a material having rigidity higher than that of the cable, the board-to-board connector 41 is not bent during the sealing operation, and the sealing operation of the hole 20 can be facilitated.

[Third effect of this embodiment]
The third effect is an effect of providing the notch portion 221 in the liquid crystal substrate 22 (see FIG. 5).

  The cutout portion 221 of the liquid crystal substrate 22 is provided at a position where the cooling air 21 that is blown from the blower duct 25 and passes through the optical unit 28 passes. Accordingly, a part of the cooling air 21 flowing through the circulation duct 24 is diverted to the space between the liquid crystal substrate 22 and the circulation box lid 261 through the notch 221.

  That is, when there is no notch 221, the space between the liquid crystal substrate 22 and the circulation box lid 261 in which the cooling air 21 does not flow so much can be used as the flow path of the cooling air 21. Thereby, the liquid crystal substrate 22 can be efficiently cooled from both sides of the liquid crystal substrate 22. As a result, the flow path in contact with the liquid crystal substrate 22 can be reduced in size, and the entire projector 1 can be reduced in size.

[Fourth effect of this embodiment]
The fourth effect is an effect of attaching the lens base 30 including the dust-proof glass 32 to the side surface of the circulation box 260 (see FIG. 7).

  In recent projectors, a lens shift mechanism may be employed for the purpose of improving installation. Although the lens shift mechanism is realized by driving a projection lens, it is difficult to keep the airtightness of the components to be driven.

  The lens base 30 according to this embodiment includes a dustproof glass 32. For this reason, even if the drive unit 33 is driven by performing the lens shift, the confidentiality inside the circulation box 260 is maintained by the dust-proof glass 32, and it is possible to prevent the outside air including dust from entering.

[Fifth effect of this embodiment]
The fifth effect is an effect obtained by configuring the circulation box 260 and the circulation box lid 261 with aluminum (see FIG. 5).

  An object with high thermal conductivity will transfer more heat per unit time than a low object. Aluminum is also known for its relatively high thermal conductivity among metals. For this reason, the circulation box 260 and the circulation box lid 261 are made of a material having a thermal conductivity equal to or higher than that of aluminum, so that the heat transfer between the inside and the outside of the circulation box 260 can be performed. This is relatively easy through H.261.

  In the circulation of the cooling air 21 shown in FIG. 5, when the cooling air 21 that has reached a high temperature flows so as to contact the circulation box 260 and the circulation box lid 261, the cooling air 21 passes through the circulation box 260 and the circulation box lid 261. Accordingly, a relatively large amount of heat can be radiated to the outside of the circulation box 260.

[Sixth Effect of the Present Embodiment]
In the present embodiment, a sealed space is not configured by combining partition walls, but a circulation box 260 that is a box-shaped partition wall is used (see FIG. 5). When a sealed space is formed that is entirely covered with a partition without using a circulation box, the parts covered with the partition need to be connected together. Specifically, parts covered with a plurality of partition walls are prepared, and the parts covered with the partition walls are connected and connected by a sealing member inside the housing of the projector. It is necessary to form a sealed space covered with a partition wall by such a procedure.

  In this case, if there are many connection parts between parts and it is difficult to seal depending on the place, and if the seal between the joined partition walls is insufficient, dust will be collected from the gap between the partition walls when using the fan. Including outside air may invade. In this case, dust may adhere to the liquid crystal panel and cause a problem.

  Further, not only when the connection of the partition wall is insufficiently sealed, but also when the partition wall itself has a gap, dust enters the inside through the gap, and the same result is obtained. For this reason, it is necessary to carefully seal not only each connecting portion but also the partition wall for the same reason.

  However, in this embodiment, as shown in FIG. 5, the cooling fan 23, the circulation duct 24, the optical unit 28, the flexible boards 220 </ b> R, 220 </ b> G, 220 </ b> B, the liquid crystal board 22, and the heat receiving heat sink 270 are placed inside the circulation box 260. Contained. That is, it is possible to easily prevent dust from adhering to the surfaces of the components inside the circulation box 260 simply by sealing the circulation box 260.

  Thereby, in this embodiment, since dust does not enter the inside of the circulation box 260, it is possible to omit the sealing process of the connecting portion between the partition walls of each component and to save the sealing member. Workability is improved and cost cut can be achieved.

[Change component]
In the above embodiment, a heat dissipation mechanism that radiates heat inside the circulation box 260 to the outside of the circulation box 260 using the heat pipe 272 is employed. However, the heat dissipation mechanism is not limited to this mechanism, and any heat dissipation mechanism may be employed.

  For example, there is a heat dissipation mechanism that uses a thermoelectric conversion element such as a Peltier element as the heat dissipation mechanism. The Peltier element has a property of transferring heat from the heat receiving portion to the heat radiating portion by applying a voltage. The thermoelectric conversion element is arranged in the circulation box 260 so that the heat receiving part of the thermoelectric conversion element is inside the circulation box 260 and the heat radiation part is outside the circulation box 260. And by applying a voltage to the thermoelectric conversion element, it is possible to dissipate heat in the same manner as the heat dissipating mechanism using the heat pipe 272. Similar results can be obtained by using a radiator.

  Further, the hole 20 through which the board-to-board connector 41 for connecting the main board 4 and the liquid crystal board 22 is inserted may be formed in the circulation box lid 261 as in the above-described embodiment, but on the surface of the circulation box 260. It may be formed.

  In the above embodiment, the light source unit 5 including the optical system shown in FIG. 6 is used as the light source of the projector 1. However, the light source of the projector 1 may be a light source other than the light source unit 5. For example, the light source may be a light source generally used as a projector light source such as a halogen lamp, a xenon lamp, or an ultrahigh pressure mercury lamp.

1 projector 20 hole 22 liquid crystal substrate 220R, 220G, 220B flexible substrate 221 notch 23 cooling fan 260 circulation box 261 circulation box lid 270 heat receiving heat sink 271 heat radiation heat sink 28 optical unit 280R, 280G, 280B liquid crystal panel 3 projection lens 30 lens base 4 Main board 5 Light source unit 7 Sealing material

Claims (5)

A main board for outputting video signals;
First to third liquid crystal panels;
A liquid crystal substrate that receives the video signal and generates first to third drive signals for driving the first to third liquid crystal panels;
First to third flexible substrates for supplying the first to third drive signals generated by the liquid crystal substrate to the first to third liquid crystal panels;
A circulation box for hermetically housing the first to third liquid crystal panels, the first to third flexible substrates, and the liquid crystal substrate;
A cooling mechanism that is provided in the circulation box and circulates cooling air in the circulation box;
A connection member for supplying the liquid crystal substrate with the video signal output from the main substrate;
Holes formed in the circulation box;
Comprising
The main board is provided outside the circulation box,
The projector, wherein the connection member is inserted into the hole of the circulation box, and a sealing material for sealing between the hole and the connection member is provided. The projector according to claim 1.
A projector, wherein the connecting member is a board-to-board connector. The projector according to claim 1 or 2,
An optical unit that includes the first to third liquid crystal panels and synthesizes and emits the image lights from the liquid crystal panels;
The liquid crystal substrate further comprises a cutout portion formed by cutting out from the edge of one side toward the substrate inner surface,
The said notch part is a projector provided in the position where the said cooling wind which passed the said optical unit passes. The projector according to claim 3.
An opening formed on the wall surface of the circulation box at a position where the light emitted from the optical unit is emitted from the circulation box;
A projection lens;
A drive unit attached to the opening and holding the projection lens movably in a direction perpendicular to the light emitted from the optical unit;
A dust-proof glass that transmits the light emitted from the optical unit and is attached to the drive unit to seal the inside of the circulation box;
Further equipped with a projector. A main board for outputting video signals;
A projector wiring method performed by a projector including first to third liquid crystal panels,
A liquid crystal substrate for inputting the video signal and generating first to third driving signals for driving the first to third liquid crystal panels, respectively;
Supplying the first to third driving signals generated by the liquid crystal substrate to the first to third liquid crystal panels by the first to third flexible substrates;
Storing the first to third liquid crystal panels, the first to third flexible substrates, and the liquid crystal substrate in a circulation box;
Cooling air is circulated in the circulation box by a cooling mechanism,
Supplying the video signal output from the main board by the connecting member to the liquid crystal board;
Forming a hole in the circulation box;
The liquid crystal substrate and the main substrate provided outside the circulation box are connected by the connection member through the hole,
A method of wiring a projector, wherein a sealant seals between the hole and the connection member.