JPH08186784A - Projection type display device - Google Patents

Abstract

PURPOSE: To provide a projection type display device which contains a cooling mechanism to effectively cool each inside part of the display device. CONSTITUTION: A vent hole and an exhaust hole are formed on the front and rear faces of the lamp case of a light source lamp unit 8 of a projection type display device 1 and toward the optical axis of the lamp case. The vertical and horizontal circumference surfaces of the lamp case are substantially blocked up. An exhaust fan 16 is provided on the back of the lamp case, and an auxiliary intake fan 17 is attached to a power unit 7 to forcibly supply the air into the unit 7. A 2nd intake port is formed on the upper wall of a sheathing case corresponding to the position of an intake fan 15. At least a part of the air flow supplied into the device 1 by the fan 15 flows into the lamp case along its optical axis and flows at the periphery. As a result, the inside parts of a light source lamp, a reflector, etc., are effectively cooled. The air is forcibly supplied into the unit 7 by the fan 17 and the inside of the unit 7 is satisfactorily cooled. A sufficient amount of air is supplied through the 2nd auxiliary intake port even if the main intake port is blocked. Therefore, the inside of the device 1 is satisfactorily cooled at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes a white light beam from a light source into three color light beams of red, blue and green, and makes each of these color light beams correspond to image information through a light valve composed of a liquid crystal panel. The present invention relates to a projection display device that re-synthesizes the modulated light fluxes of the respective colors after being modulated and re-synthesized and magnifies and projects the light flux on a screen through a projection lens. More specifically, the present invention relates to a cooling mechanism for efficiently cooling the inside of such a projection display device.

[0002]

2. Description of the Related Art A projection display device basically comprises the following parts. That is, a light source lamp unit, an optical lens unit that optically processes a white light flux emitted from this unit so that a color image corresponding to video information can be combined, and a projection that projects the combined light beam on a screen. It is a circuit board group on which a lens unit, a power supply unit, a control circuit and the like are mounted. Except for the projection lens unit, each of these parts is arranged inside the device exterior case. The projection lens unit is generally mounted so as to project from the front surface of the device. Operating members such as a power switch, a light receiving window for remote control, and the like are arranged on the surface of the outer case.

In this type of projection display device, a cooling mechanism for cooling a light source lamp unit, a power supply unit, etc., which are internal heat sources, is incorporated. In general, after introducing the outside air from the ventilation port of the outer case with an intake fan and letting the outside air flow through the part of the internal heat source,
Air is exhausted to the outside from an exhaust port formed in the outer case by an exhaust fan.

[0004]

If the projection type display device is made small and compact so that it can be carried easily, the internal space becomes narrow, and it may not be possible to ensure a sufficient flow passage for the cooling air. Further, it is desirable to cover the power supply unit and the like with a shield plate in order to prevent noise generation, but in this case, the interior of the power supply unit becomes a space isolated from other portions. For this reason, the cooling air does not sufficiently flow inside the power supply unit, which results in inefficient cooling. Further, when clogging occurs in the outside air introduction port opened in the outer case, sufficient outside air cannot be introduced into the inside of the apparatus, which causes an adverse effect of insufficient cooling operation.

An object of the present invention is to realize a projection type display device provided with a cooling mechanism capable of efficiently cooling each part inside the device, paying attention to such a point.

[0006]

The cooling mechanism of the projection type display device of the present invention is basically the same as the conventional cooling air intake port formed in the outer case of the device and the outside air from the inside of the case. An intake fan to be introduced, an air exhaust port formed in the device exterior case for exhausting the air introduced into the case to the outside, and an exhaust fan to exhaust the internal air to the outside through the air exhaust port. Have

A feature of the present invention is that the lamp case of the light source lamp unit, which is a heat source, has a vent hole for introducing cooling air formed on the front surface in the optical axis direction and an exhaust gas on the rear surface in the optical axis direction. The mouth is formed, and the left, right, upper, and lower peripheral surfaces are substantially closed. Then, the arrangement is such that the suction side of the exhaust fan is located behind the exhaust port formed in the lamp case.

The present invention is also characterized by an auxiliary intake fan for forcibly introducing cooling air into the power supply unit, which is a heat source, and air introduced into the unit by this auxiliary intake fan. It has a structure in which a discharge port for discharging the is discharged from the unit.

Further, a feature of the present invention is that the air intake port is formed in the bottom wall of the outer case, the intake fan is arranged directly above the air intake port, and the cooling air flow is directed upward. And a second intake port is formed on the upper wall of the outer case corresponding to the position of the intake fan. Then, the optical lens unit is positioned between the second intake port and the intake fan, and the optical unit includes:
An air flow passage is formed to guide the outside air introduced from the second intake port to the suction side of the intake fan and to guide the air blown out from the intake fan to the second intake port side. Is done.

Here, the periphery of the suction fan may be covered with a sealing plate to define an air passage for guiding the air descending through the air flow passage of the optical lens unit to the suction side of the intake fan. preferable.

[0011]

In the present invention, at least a part of the airflow introduced into the apparatus from the intake fan flows into the interior of the lamp case along the optical axis from the side of the vent hole on the front surface of the lamp case. It passes around the light source lamp arranged in the case, is sucked to the exhaust fan side from the exhaust port formed on the rear side, and is discharged to the outside. In this way, since the cooling air flow flows into the lamp case along the optical axis direction and flows along the periphery thereof,
The internal light source lamp, reflector, and other parts are efficiently cooled.

Further, in the present invention, at least a part of the airflow introduced from the intake fan into the inside of the apparatus is forcibly introduced into the power supply unit by the auxiliary intake fan, and the inside of the unit and the above It is sucked to the exhaust fan side through the discharge port and discharged to the outside. Therefore, even if the power supply unit is a closed space covered by a shield case or the like, it is possible to allow sufficient air to flow inside and sufficiently cool the space.

Further, in the present invention, the second intake port is formed so that the air introduced from the second intake port is guided to the intake fan side. Therefore, even if the intake port on the suction side of the intake fan is clogged, sufficient intake air can be introduced from the second intake port. Therefore, the inside can always be sufficiently cooled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A projection display device according to an embodiment of the present invention will be described below with reference to the drawings.

(Overall Structure) FIG. 1 shows the appearance of the projection display apparatus of this example. The projection display device 1 of this example has an outer case 2 having a rectangular parallelepiped shape. The outer case 2 basically includes an upper case 3, a lower case 4, and a front case 5 that defines the front surface of the device. The front end portion of the projection lens unit 6 projects from the center of the front case 5.

FIG. 2 shows the arrangement of each component inside the outer case 2 of the projection display apparatus 1. As shown in this figure, inside the exterior case 2, a power supply unit 7 is arranged at the rear end side. The light source lamp unit 8 and the optical lens unit 9 are arranged at a position adjacent to the front side of the device. The projection lens unit 6 is provided at the center of the front side of the optical lens unit 9.
The base end side of is located. On the other hand, the optical lens unit 9
On one side, an interface board 11 on which an input / output interface circuit is mounted is arranged in the front-rear direction of the device, and a video board 12 on which a video signal processing circuit is mounted is arranged in parallel with the interface board 11. Further, a control board 13 for device drive control is arranged above the light source lamp unit 8 and the optical lens unit 9. Speakers 14R and 14L are arranged at the left and right corners on the front end side of the device, respectively. An intake fan 15 for cooling is arranged in the center of the rear surface of the optical lens unit 9, and an exhaust fan 16 is arranged on the side surface of the device, which is the rear surface side of the light source lamp unit 8. The board 11 in the power supply unit 7,
An auxiliary cooling fan 17 for sucking the cooling airflow from the intake fan 14 into the power supply unit 7 is arranged at a position facing the end of 12.

(Structure of Exterior Case) As shown in FIG.
The upper case 3 of the outer case 2 is a rectangular upper wall 3a.
And the left and right side walls 3b and 3c and the rear wall 3d that extend downward substantially vertically from the three sides excluding the front side. Similarly, the lower case 4 has a rectangular bottom wall 4
a, and left and right side walls 4b and 4c and a rear wall 4d which are erected substantially vertically from three sides except the front side thereof. The front case 5 has a central portion that is curved so as to be slightly convex toward the front, and a circular opening 5b around which an annular rim 5a is formed is opened in this portion. The front end side portion of 6 extends toward the front side of the apparatus. The upper case 3 and the lower case 4 are connected to each other by fixing screws 21a, 21b and 22a, 22b at two positions on each of the left and right side walls (see FIG. 16). The front case 5 is
It is held in a state of being sandwiched by the upper case 3 and the lower case 4 from above and below.

An air filter cover 23 is attached to the upper wall 3a of the upper case 3 at the central front position. A large number of vent holes are formed in the cover 23, and an air filter 24 is attached to the inside of the cover 23 so that dust and the like do not enter from the outside through the vent holes (see FIG. 2B. )reference). A large number of communication holes 25R, 25L are formed at positions corresponding to the built-in speakers 14R, 14L at the front left and right ends of the upper wall 3a. An operation switch lid 26 is attached to the left end of the upper wall 3a. The operation switch lid 26 can be opened and closed around one end thereof as shown in FIG. 1 (c). When you open this lid 26,
A large number of operation switches 26a arranged inside are exposed (see FIG. 17B).

A lamp replacement lid 27 is attached to the bottom wall 4a of the lower case 4 at a position corresponding to the built-in light source lamp unit 8. This replacement lid 27 is the lower wall 4
The light source lamp unit 8 can be replaced by loosening the screw and removing the lid 27. A vent hole 28 is provided at a position in front of the replacement lid 27.
Are formed. The vent hole 28 is formed at a position corresponding to the built-in cooling intake fan 15. The air filter 29 (see FIG.
(See (b)) is attached to prevent dust and the like from entering the inside.

Height adjusting feet 31 (31R, 31L) are arranged at the left and right corners of the front end of the bottom wall 4a. These feet 31 can be finely adjusted in height by turning them, and by operating the height adjustment buttons 32 (32R, 32L) projecting to the lower side portions of both ends of the front case 5, these feet 31 can be adjusted. The height of the foot 31 can be roughly adjusted (coarse adjustment). A protrusion 33 is formed at the center of the rear end side of the bottom wall 4a.
Then, the device 1 is installed on a table or the like while being supported at three points by the above-mentioned two feet 31. In addition, to prevent the device from rattling when the installation surface is uneven,
Auxiliary protrusions 34R and 34L are also formed on both ends on the rear end side of the bottom wall.

On the other hand, at the upper end position on the right side of the front case 5 which defines the front surface of the apparatus and the central position of the rear wall 3d of the upper case 3 which defines the upper half of the rear surface of the apparatus,
Light receiving windows 35F and 35R are arranged respectively. These light receiving windows are for receiving control light from the remote controller. As described above, in this example, since the light receiving windows are formed in the front and rear of the device, it is convenient because the remote operation can be performed from either the front side or the rear side of the device.

An AC inlet 36 for supplying external power and a main power switch 37 are arranged at the left end of the rear wall 4d of the lower case 4 which defines the lower half of the rear surface of the device. .

A portable handle 38 is provided on the left side surface of the device.
Is installed. The two base end portions 38a and 38b of the handle 38 are rotatably attached to the mating surfaces of the side walls 3b and 4b of the upper case 3 and the lower case 4. On the side wall 3b on the upper case side,
A recess 3e for storing the handle is formed so that the handle 38 can be stored therein. In addition, an LED display unit 39 for displaying the operating state of the device is arranged at the upper end portion of the side wall 3b. An input / output terminal cover 41 that can be opened and closed centered on the lower end is attached to the side wall 4b on the lower case side. When this is opened, a large number of input / output terminals 42 arranged inside are exposed (see FIG. 1).
7 (a)).

Exhaust holes 43 are formed on the side walls 3c and 4c of the upper case and the lower case that define the opposite side surface of the apparatus in a state where both of them cross. An exhaust fan 16 for cooling is located on the back side of the exhaust hole 43 via an air filter.

(Light Source Lamp Unit) The light source lamp unit 8 will be described with reference to FIGS. 2A and 7. The light source lamp unit 8 includes a light source lamp 801 and a substantially rectangular parallelepiped lamp housing 8 that houses the light source lamp 801.
It is composed of 02. In this example, the lamp housing 802 has a dual structure of an inner housing 803 and an outer housing 804. Light source lamp 801
Is composed of a lamp body 805 such as a halogen lamp and a reflector 806, and emits light from the lamp body 805 toward the optical lens unit 9 side along the optical axis 1a.

The outer housing 804 has an opening on the front surface in the direction of the optical axis 1a.
09 is attached. A large number of slit groups 807 for passing cooling air are formed on the back surface in the optical axis 1a direction. The inner housing 803 is attached to the front surface of the light source lamp 801, the opening for passing the emitted light is an opening, and the passage for cooling air 80 is provided in the outer peripheral portion.
Many 8 are formed. In this example, the inner housing 803 and the light source lamp 801 are integrally formed. The lamp replacement is configured such that the lamps are attached and detached as they are.

(Optical Lens Unit) In the optical lens unit 9, the optical elements other than the prism unit 910 constituting the color synthesizing means of the upper and lower light guides 901 and 902 have the shape shown in FIG. 3A. It is structured such that it is sandwiched and held from above and below. The upper light guide 901 and the lower light guide 902 are fixed to the upper case 3 and the lower case 4 by fixing screws. The upper and lower light guide plates 901 and 902 are also fixed to the prism unit 910 side by fixing screws. The prism unit 910 is a thick head plate 9 that is a die-cast plate.
It is fixed to the back side of 03 by a fixing screw. The base end side of the projection lens unit 6 is similarly fixed to the front surface of the head plate 903 by a fixing screw. Therefore, in this example, the head plate 903 is sandwiched and the prism unit 910 and the projection lens unit 6 are integrally fixed. In this way, the head plate 903 having high rigidity is sandwiched, and both of these parts are integrated. Therefore, even if a shock or the like acts on the side of the projection lens unit 6, the positional displacement of both members does not occur.

(Optical System) The optical system incorporated in this example will be described below. FIG. 19 shows only the optical system of the projection display apparatus 1 of this example. The optical system of this example is
An illumination optical system 923 including the above-mentioned light source lamp 805, integrator lenses 921 and 922 which are uniform illumination optical elements, and a white light beam W emitted from this illumination optical system 923 are converted into red, green and blue light beams. A color separation optical system 924 for separating into R, G, and B, and three liquid crystal light valves 925R and 92 as light valves for modulating each color light flux.
5G, 925B, a prism unit 910 as a color combining optical system for re-combining the modulated color light beams, and a projection lens unit 6 for enlarging and projecting the combined light beams on a screen. Further, it has a light guide system 927 for guiding the blue light flux B among the respective color light fluxes separated by the color separation optical system 924 to the corresponding liquid crystal valve 925B.

As the light source lamp 805, a halogen lamp, a metal halide lamp, a xenon lamp or the like can be used. The uniform illumination optical system 923 includes the reflection mirror 9
31, the central optical axis 1a of the light emitted from the illumination optical system is bent at a right angle toward the front of the device. The integrator lenses 921 and 922 are arranged so as to be orthogonal to each other with the mirror 931 sandwiched therebetween.

The color separation optical system 924 includes a blue-green reflection dichroic mirror 941 and a green reflection dichroic mirror 94.
2 and a reflection mirror 943. White light flux W
First, in the blue-green reflective dichroic mirror 941, the blue luminous flux B and the green luminous flux G contained therein are reflected at right angles, and the green reflective dichroic mirror 942 is reflected.
Head to. The red light flux R passes through this mirror 942, is reflected at a right angle by the rear reflection mirror 943, and is emitted from the emission portion 944 of the red light flux to the prism unit 910 side. The blue and green luminous fluxes B and G reflected by the mirror 941 are reflected by the green reflection dichroic mirror 942.
In, only the green light flux G is reflected at a right angle and is emitted from the emission portion 945 of the green light flux to the color combining optical system side.
The blue light flux B that has passed through this mirror 942 is emitted from the emission portion 946 of the blue light flux to the light guide system side. In this example,
From the emitting portion of the white light flux of the uniform illumination optical element to the emitting portions 944, 945, 9 of the respective color light fluxes in the color separation optical system 924.
All the distances up to 46 are set to be equal.

Emitting section 9 of each color luminous flux of color separation optical system 924
Condensing lenses 951, 952, and 953 are arranged on the emission sides of 44, 945, and 946, respectively. Therefore, the respective colored light fluxes emitted from the respective emission parts are incident on these condenser lenses 951, 952 and 953 and are collimated.

The colored light fluxes R, G, which are collimated in this way,
Of B, the red and green light fluxes R and G enter the liquid crystal light valves 925R and 925G and are modulated, and image information corresponding to each color light is added. That is, these light valves are switching-controlled by drive means (not shown) in accordance with the image information, so that each color light passing therethrough is modulated. As this driving means, known means can be used as it is. On the other hand, the blue light flux B is guided to the corresponding liquid crystal light valve 925B via the light guide system 927, and is similarly modulated here according to the image information. As the light valve of this example, for example, one using a polysilicon TFT as a switching element can be used.

The light guide system 927 is an incident side reflection mirror 971.
And an emission side reflection mirror 972, an intermediate lens 973 arranged between them, and a condenser lens 973 arranged on the front side of the liquid crystal panel 925B. Regarding the optical path length of each color light beam, that is, the distance from the light source lamp 805 to each liquid crystal panel, the green light beam B is the longest, and therefore the light amount loss of this light beam is the largest. However, the light guide system 92
By interposing 7 therebetween, it is possible to suppress the light amount loss. Therefore, it is possible to substantially equalize the optical path lengths of the light fluxes of the respective colors.

Next, the respective color luminous fluxes which have been modulated through the respective liquid crystal panels 925R, G, B are made incident on the color synthesizing optical system 910 and are re-synthesized there. In this example, the color combining optical system is configured by using the prism unit 910 composed of the diclick prism as described above. The color image recomposed here is enlarged and projected on the screen at a predetermined position via the projection lens unit 6.

Here, in the optical system of this example, in addition to the above configuration, it is preferable to arrange a half-wave plate in the path of the light flux of each color to align the light flux of each color with S-polarized light.
When only S-polarized light is used in this way, the color separation property of the dichroic mirror is improved as compared with the case where random polarized light in which P-polarized light and S-polarized light are mixed is used as it is. Further, although the light guide system 927 uses a mirror to reflect the light flux, since the S-polarized light has a higher reflectance than the P-polarized light, there is also an advantage that a light amount loss and the like can be suppressed.

(Prism Unit 910) Next, the prism unit 910 is a prism having a square cross section formed by bonding four prisms having the same refractive index in a triangular prism shape. A dielectric film is formed to give desired optical characteristics.

If these four prisms are not adhered accurately, the images of the respective colors synthesized through the obtained prism unit 910 will not be aligned on the screen, and the image quality will deteriorate. For example, as shown in FIG. 20, when a bonding surface has a step, such an adverse effect occurs. As shown in FIG. 21, four prisms 910a and 910 are used to accurately bond the prisms.
Of the 10b, 910c and 910d, the pair of prisms 910a, 910b are first attached with a step, and the remaining pair of prisms 910c, 910d are also attached with a step, after which these step The surfaces 910e and 910f are used as alignment surfaces to bond the prisms of each pair.

However, with this method, although alignment in one direction is possible, alignment in a direction orthogonal to this is not possible. Therefore, in the prism unit 910 of this example, four prisms are accurately bonded together as follows. As shown in FIG. 22, the prism 910c is set to the longest, the prisms 910b and 910d are set to the shortest, and the remaining prisms 910a are set to the intermediate length.
Longest prism 910c and shortest prism 910
and d are attached to each other in a state where there is a step on the top and bottom. Similarly, a prism 910a having an intermediate length and a prism 910b having the shortest length are attached to each other in a state where there is a vertical step. After this, each pair of prisms is attached so that the longest prism 910c and the prism 910a of the middle length have a stepped upper end.

In the prism unit 910 obtained by bonding in this way, in addition to the alignment surfaces 910e and 910f similar to the conventional ones, the alignment surfaces 910g and 910i parallel to the alignment surfaces are also used as alignment surfaces. Is formed. Further, a positioning surface 910j orthogonal to these positioning surfaces is formed on the upper end side. Therefore, a jig can be applied to these surfaces to accurately bond the four prisms.

Further, the prism unit 910 of this example bonded in this way has orthogonal alignment surfaces 910f and 910 formed at the upper end of the prism 910c.
By using j, the optical lens unit 9 is mounted at a predetermined mounting position as described below, so that the optical lens unit 9 is accurately positioned.

That is, in this example, the prism fixing plate 91
As the No. 1, a resin having the shape shown in FIG. 23 is used. On the surface of the fixing plate 911, the prism 91
A mounting groove 911a having an isosceles right triangle with a depth to which the upper surface 910j of 0c is just fitted is formed. The upper end surface 910k of the prism 910c is bonded and fixed to the bottom surface 911b of this groove. A pair of side faces 9 of the groove that intersect at right angles
By pressing the alignment surfaces 910j and 910f of the prism 910c against 11c and 911d, respectively,
Since the center of the prism unit 910 is accurately positioned, the prism unit 910 is mounted at the correct position.

In this example, the prism fixing plate 911 is fixed to the bottom wall 92 of the head plate 903 by a plurality of fixing screws, and the prism unit 910 is attached to the upper surface of the bottom wall 92.

(Mechanism for Preventing Light Stroke) Next, in the prism unit 910 of this example, the light valve 9
Although the red light flux passes through the prism surface on which the modulated light flux passing through 25R is incident, it is preferable to attach a glass filter 912 that absorbs and blocks the blue light flux. That is, as shown in FIG. 24, the glass filter 912 is formed on the incident surface 910R of the red modulated light flux of the prism unit 910.
Is pasted. The modulated light flux of each color which has passed through each light valve 925R, G, B passes through the inside of the prism unit 910, is reflected by the X-shaped reflection surface thereof, and is emitted to the projection lens unit 6 side. However, a small amount of light of each color passes as it is without being reflected by the reflecting surface, and reaches the side of the liquid crystal light valve which faces the liquid crystal light valve with the prism unit 910 sandwiched therebetween. For example, the blue modulated light beam may pass through the blue reflecting surface and enter the red light valve 925R from the back surface thereof. On the contrary, the red modulated light beam may pass through the red reflecting surface and enter the rear side of the blue light valve 925B. Furthermore, the green modulated light beam may be reflected by the red light valve 925R side without passing through the prism unit 910. When light is incident on the liquid crystal light valve from the back side as described above, there is a possibility that the liquid crystal panel malfunctions or is adversely affected. In particular, such an influence of blue light, which is light on the short wavelength side, is particularly large. Therefore, as described above, by attaching the glass filter 912 to the incident surface 910R of the red modulated light flux in the prism unit 910 to prevent the blue light flux from entering the liquid crystal light valve 925R from the back surface side, The harmful effect can be avoided.

In addition to the above filter 912, a filter for absorbing the red light flux may be attached to the side of the incident surface of the blue modulated light flux.

(Power Supply Unit) The power supply unit 7 is shown in FIG.
As shown in FIG. 7, each constituent element is built in the metal shield case 701 to prevent electric and magnetic noise generated in this portion from leaking to the outside. The shield case 701 has a size that extends over the left and right sidewalls of the exterior case 2 of the device, and the left end portion has a planar shape that projects toward the front side of the device with a constant width. That is, in front of the projecting portion 702, the reflection mirror 931 of the uniform illumination system of the optical system block 9 is 45 in the front-back direction of the device.
It is arranged at an angle of degrees. The space on the back side tends to become a dead space. In this example, this space 703
In order to effectively utilize the above, the shield case 701 is projected toward the space 703 to form a projecting portion 702, and a space for arranging the components of the power supply unit is secured.

Shield case 701 of power supply unit 7
Has a rectangular hollow cross section, and its rigidity is generally higher than other parts. The bottom side of the case 701 is fixed to the bottom portion 4a of the lower case 4 by a plurality of fixing screws. The upper surface side is fixed to the upper wall 3a of the upper case 3 by a plurality of fixing screws. As described above, in this example, since the upper case 3 and the lower case 4 are fixed to the shield case 701 having high rigidity on the device rear end side, the outer case of the device rear end portion has high integrity. The rigidity is also high.

Here, the power supply unit 7 is heavier than other parts arranged in the apparatus. The parts that are heavy in the device together with the power supply unit 7 are
A prism unit 91 fixed before and after the head plate 903
0 and the projection lens unit 6. In this example, FIG.
As can be seen clearly, the power supply unit 7 is arranged in a horizontally long state at the rear end of the device. In addition, the power supply unit 7
By appropriately setting the arrangement of the respective constituent elements, the center of gravity thereof is adjusted so as to be located at the center in the width direction of the device. On the other hand, on the front end side of the apparatus, the prism unit 910 and the projection lens unit 6 are arranged in the center thereof. Therefore, in this example, the position of the center of gravity of the device is located substantially at the center of the device in the width direction and the front-rear direction. As a result, even if the device is accidentally dropped while the device is carried in a posture in which the portable handle 38 is pulled out and the left side of the device faces upward as shown in FIG. Since it is located in the center on the left and right, it will fall in that posture. When the position of the center of gravity of the device is shifted to the front or rear or to the left or right, the device falls while falling toward the center of gravity. When dropped in this way, the corners of the exterior case of the device first collide with the floor surface or the like, so that an excessive impact force acts locally, and there is a high possibility that the part will be damaged. However, in this example, since the device falls back and forth, without falling to the left or right, the lower right side of the device as a whole collides with the floor or the like almost at the same time, and the possibility of local damage is extremely low. There are advantages.

Further, in the conventional power supply unit 7, the bottom surface or the top surface side is only fixed to the exterior case 2 side. However, in this example, FIG.
As can be seen from the figure, even at the height position corresponding to the center of gravity of the power supply unit 7 in the vertical direction of the device, the fixing screw 7
It is fixed to the outer case 2 by 04. In this example, it is fixed to the rear wall 4d of the lower case 4. As a result, when a vibration in the front-rear direction is applied to the device, the front-back vibration of the power supply unit 7 is effectively prevented.

On the other hand, in the power supply unit 7 of the present example, the lead wire as the noise source is shortened as much as possible by shortening the power supply path and the like from here to each drive portion as much as possible, and thereby the noise is generated. To prevent the occurrence of. First, the AC inlet 36 and the main power switch 3
7 is directly fixed to the rear side surface of the shield case 701 of the power supply unit 7. Therefore, the lead wires routed from these respective parts to the power supply unit 7 can be omitted.

Further, an interlock switch 710 that interlocks with the opening and closing of the lamp replacement lid 27 attached to the rear surface of the device is also integrally attached to the front side surface of the shield case 701 of the power supply unit 7. That is, as shown in FIG. 2, the interlock switch 710 is attached to a portion of the shield case projecting portion 702 that is slightly away from the right side of the device. The operating portion 711 of the switch 710 faces downward, and is constantly pushed upward by the operating protrusion 271 extending vertically from the upper surface of the replacement lid 27. In this state, the interlock switch 710 is in the on state. On the other hand, when the replacement lid 27 is removed, the operating portion of the switch 710 moves downward and the switch is switched to the off state. As described above, the switch 710, which is conventionally located away from the power supply unit 7, is fixed to the side surface of the shield case 701 of the power supply unit, and the lead wire up to that position is shortened.

Further, in the power supply unit 7 of this example, the ballast circuit portion 720 which is the drive circuit of the lamp unit 8 adjacently arranged on the front side of the device is arranged on the same side as the lamp unit 8. The lead wire from here to the lamp unit 8 is made as short as possible.

As described above, in this embodiment, the power supply path drawn out from the power supply unit 7 and reaching each drive portion is made as short as possible, so that the number of noise sources is reduced and noise is generated as compared with the conventional case. Can be suppressed.

(Arrangement of Substrate) FIGS. 11, 12 and 1
3, the interface board 11 and the video board 1
2 and the arrangement of the control board 13 will be described. First,
As shown in FIG. 16, the control board 13 is arranged in parallel with the lower wall of the upper wall 3a of the upper case 3, and is fixed to the upper case 3 by fixing screws at a plurality of positions on the outer peripheral edge. ing. The substrate 13 has a shape that covers the upper surfaces of the optical system block 9 and the light source lamp unit 8. Further, the portion directly above the prism unit 910 has a rectangular shape. This board 1
In the left end portion of the device No. 3, contacts corresponding to the operation switch group 26a arranged at the left end of the upper surface of the device are arranged.

As can be seen from FIG. 13, the interface boards 11 are arranged in parallel at a position slightly higher than the bottom wall 4a of the lower case 4. Further, the video board 12 is arranged in parallel with the side wall on the left side of the device in a posture of standing upright in the device vertical direction from the surface side of the interface substrate 11. These two substrates 11 and 12 are supported by a substrate fixing metal fitting 111 fixed to the bottom wall 4 a of the lower case 4. Further, a shield plate 112 is attached to the upper end of the board fixing member 111, and the upper end side of the shield plate 112 extends to the upper end of the video board 12. Therefore, these two substrates 11, 1
2, the shield plate 112 and the board fixing member 111 define a shield space between them.
Therefore, the noise generated from the electric element and the electronic element arranged between them is prevented from leaking to the outside.

Here, the electrical connection between the substrates is as follows. First, on the surface of the interface board 11, a connector 113 with the side of the video board 12 is arranged. On the surface of the video board 12 on the lower end side, a connector 114 that can be inserted and connected to the connector 113 is arranged. Similarly, a connector 115 to the control board 13 side is arranged on the upper surface of the video board 12. On the back surface of the control board 13, a connector 116 that can be inserted and connected to the connector 115 is arranged. Therefore, as shown in FIG. 13, each substrate 11, 12, 1
In the state where 3 is arranged, the corresponding connectors are connected to each other.

As described above, in this example, the connections between the substrates are formed without arranging lead wires or the like. Therefore, the number of noise generation sources is small, and the generation of noise can be suppressed.

Further, in this example, as can be seen from FIG. 11, the corner portions of the outer peripheral edge of the control board 13 are fixed to the side of the outer case 2, that is, the ground side, using fixing screws. Such a corner portion is a portion where noise is likely to occur. However, by grounding such a portion as in this example, it is possible to suppress the generation of noise.

(Structure of Head Plate Section) The shape of the head plate 903 will be described mainly with reference to FIGS. 4 and 6. The head plate 903 basically includes a vertical wall 91 extending in a vertical posture in the width direction of the apparatus, and a bottom wall 92 horizontally extending from a lower end of the vertical wall 91. Vertical wall 91
8 is a wall having a large number of reinforcing ribs 91a vertically and horizontally formed on the surface thereof and having a high out-of-plane rigidity, and a rectangular portion through which the light emitted from the prism unit 910 passes in the central portion thereof. The opening 91b is formed. Further, a screw hole 91c for fixing the prism unit is formed in the vertical wall 91, and the projection lens unit 6 is also provided.
A screw hole 91d for fixing the base end side of is formed. As can be seen from FIG. 4, the base end side of the projection lens unit 6 is fixed to the front surface of the vertical wall 91, and the prism unit 910 is fixed to the rear surface thereof.

As described above, since the prism unit 910 and the projection lens unit 6 are fixed in a state where the vertical wall 91 having high rigidity is sandwiched and aligned with each other, their integrity is high and impact force or the like acts. However, there is an advantage that the possibility of mutual positional deviation is extremely small.

The cooling fan 15 is attached to the back surface of the bottom wall 92 of the head plate 903. In this bottom wall 92,
A communication hole (not shown) for circulating the cooling air is formed.

As can be seen from FIGS. 2B and 4A, the upper wall 3 and the lower wall of the vertical wall 91 of the head plate 903 are attached to the upper case 3 and the lower case 4, respectively. , 91f are formed. These portions are fixed to the upper case 3 side and the lower case 4 side by fixing screws, respectively.

Thus, in this example, as described above, the rear case portion of the upper case 3 and the lower case 4 is fixed to the power supply unit 7, and the front end portion thereof is fixed to the head plate 903. ing. In this way, since the front and rear parts are fixed to the portion having high rigidity, the integrity and rigidity of the upper case 3 and the lower case 4 are improved. Therefore, the impact resistance is improved and the damage caused by dropping or the like is reduced.

(Cooling Mechanism) Next, with reference to FIGS. 7, 8, 9 and 10, a cooling mechanism for each heat generating portion in the projection display apparatus 1 of this example will be described.

The basic cooling air flow in the device 1 of this example has a path as shown in FIG. 8 in plan view.
The air sucked from the outside by the cooling suction fan 15 through the ventilation hole 28 formed in the bottom wall 4a of the device 1 passes through the inside of the optical lens unit 9 and is exhausted on the right side surface of the device. It is again discharged to the outside by the fan 16. As shown by the bold line in FIG. 8, the main air flow path has a part of the air flow 1100 passing through the optical lens unit 9 and reaching the exhaust fan 16 in a straight line when seen in a plan view. , Passes through here and is discharged to the outside.

Another air flow 1120 is from the optical lens unit 9 to the front side of the light source lamp unit 8 and a ventilation hole 804a formed in the outer housing 804 thereof.
And, it enters into the inside through a vent hole 808 formed in the inner housing 803. After passing through this, it passes through the exhaust port 807 on the back side and is discharged to the outside via the exhaust fan 16 on the back side.

On the other hand, another air flow 1130 is sucked through the optical lens unit 9 by the auxiliary suction fan 17 attached to the end of the power supply unit 7,
It is drawn into the power supply unit 7, passes through the inside, is sucked by the exhaust fan 16 from the other end, and is discharged to the outside.

FIG. 9 shows the three-dimensional flow of the flow path of the air flow 1130 passing through the inside of the power supply unit 7. As shown in this figure, the air flow 1130 is sucked from the outside by the suction fan 15 and then blown upward along the surfaces of the light valves 925R, G, B of the optical lens unit 9 on the incident side and the emitting side. The
It penetrates between this upper surface and the back surface of the upper wall 3a of the upper case through the ventilation hole formed in the upper light guide 901,
Lateral flow along these. Next, through the ventilation hole formed in the upper light guide 901, the portion of the optical lens unit 9 in which the integrator lenses 921 and 922, which are uniform illumination optical elements, are arranged is lowered to be opened in the lower light guide 902. The air flows into the power supply unit 7 through the suction fan 17 after passing around from the ventilation hole to the lower side. After that, the gas flows to the exhaust fan 16 side and is discharged to the outside via this.

In this way, in this example, the auxiliary exhaust fan 17 is arranged to forcibly introduce the cooling airflow into the power supply unit 7. Therefore, it is possible to effectively cool the inside of the power supply unit that is the heat source.

FIG. 7 shows a three-dimensional flow of the air flow 1120 flowing through the light source lamp unit 8.
As shown in this figure, the air flow 1120 flows between the upper light guide 901 and the back surface of the upper case upper wall 3a and reaches the upper end of the light source lamp unit 8 on the emission side. From here, it flows along the surface of each component of the light source lamp unit 8 and reaches the exhaust fan 16 on the rear side. That is, the airflow 1120 flows along the inner and outer surfaces of the outer housing 804 and the inner and outer surfaces of the inner housing 803. Furthermore, it flows along the surface of the reflector 806.

As described above, in this example, the air flow 1 is directed from the front end side to the rear side of the light source lamp unit 8 along the optical axis.
120 is formed, and the lamp 805 and the reflector 806 are formed.
The surroundings of the heat source such as are efficiently cooled.

Next, in this example, as can be seen from FIGS. 9 and 10, the ventilation holes 24 are also provided on the upper wall 3a side of the upper case.
Are formed. Therefore, for example, the intake fan 1
When the filter 29 attached to the ventilation hole 28 of No. 5 is clogged and sufficient outside air cannot be introduced through this, the outside air is introduced from the upper ventilation hole 24 as follows. . As shown in FIG. 10, when the lower vent hole 28 is clogged, the inside becomes a negative pressure state, so the upper vent hole 2
The outside air is introduced from No. 4, and an air flow as shown by a thick line 1140 is generated. This air flow 1140 is introduced from the ventilation hole 24, is sucked by the intake fan 15 on the lower side, and is blown up again through the suction fan 15. A part becomes a circulation flow and circulates through the intake fan 15 (of course, such a circulation flow occurs even in a normal case where the lower vent hole 28 is not clogged). The other airflows pass through the respective portions as the airflows 1110, 1120, and 1130 as described above, and are discharged from the exhaust fan 16 to the outside.

Here, in order to effectively introduce the outside air from the upper vent hole 24 when the lower vent hole 28 is clogged, the sealing plate 1 is provided around the intake fan 15.
I have attached 150. The sealing plate 1150 has a vent hole at a portion corresponding to the vent hole 24, but the periphery thereof is in close contact with the lower light guide 902 and the back surface of the bottom wall 92 of the head plate. Therefore, the circulation flow as shown in FIG. 10 is efficiently formed. That is, the upper communication hole 2
The outside air from 4 is effectively introduced.

As described above, in this example, since the communication hole 24 is provided, even if the communication hole 28 for introducing the outside air on the intake fan 15 side is clogged, the inside of the device can be cooled without any trouble. . Further, since the sealing plate 1150 is attached, it is possible to efficiently introduce the outside air from the ventilation hole 24 separated from the intake fan 15 in such a clogging state.

(Light Valve Positioning Mechanism) Next, referring to FIG. 4 and FIG. 5, the liquid crystal light valve 925 of the present example.
The R, G, B positioning mechanism will be described. These three
Since the positioning mechanism of the one light valve is the same, the positioning mechanism of one light valve 925R will be described.

The light valve block 1200 to which the light valve 925R is attached is the bottom wall 9 of the head plate 903.
It is fixed to the upper surface of 2. The light valve block 1200 includes the lower adjustment plate 12 attached to the bottom wall 92.
Have ten. A pair of left and right elongated holes 1211 and 1212 are formed in the lower adjusting plate 1210, and these have a long shape in the optical path direction.
The bottom wall 9 of the head plate is fixed by the fixing screws 1213 and 1214.
It is fixed to 2.

A focus adjusting plate 1220 is attached to the upper surface of the lower adjusting plate 1210 so as to be perpendicular to the optical path. The focus adjustment plate 1220 is provided on the vertical wall 1
221, a bottom wall 1222 horizontally extending from the lower end to the upstream side of the optical path, and an upper wall 1223 horizontally extending from the upper end of the vertical wall 1221 to the downstream side of the optical path. A dowel 1224 is formed at the center of the bottom wall 1222.
10 rotatably supported. Therefore, the focus adjusting plate 1220 can be swiveled to the left or right around the perpendicular line passing through the dowel 1224. The bottom wall 1222 is fixed to the lower adjustment plate 1210 side by a pair of fixing screws 1225. On the other hand, the upper wall 1 of the focus plate 1220
223 is fixed to a cover 910a that covers the upper surface of the prism unit 910 with a fixing screw 1226. The screw hole 1227 of this screw 1226 is
The size of the focus adjustment plate 1220 can be slightly moved back and forth and left and right by loosening the screw 1226. Further, the notch 12 is provided at the tip of the upper wall 1223.
28 are formed. Prism unit cover 910
Notches 910b are also formed on the side of a at positions facing the notches 1228 at predetermined intervals. When the focus plate 1220 is attached, an insertion groove 1229 into which a blade tip of a flat-blade screwdriver or the like can be inserted is formed between these notches. With the fixing screws 1226 etc. slightly loosened, this insertion groove 1
If you insert a blade such as a screwdriver into 229 and rotate it,
The focus adjustment plate 1220 is used for the prism unit 910.
On the other hand, while turning around the dowel 1224 as a center line, it also moves in the optical path direction (front-back direction).

As described above, the vertical adjustment plate 1230 is supported by the vertical wall 1221 of the focus plate 1220 which is movable back and forth along the optical path direction in a state parallel to the vertical wall 1221.
That is, vertical adjustment plate support portions are formed above and below the vertical wall 1221 and the vertical adjustment plate 1230 is sandwiched between them. The lower end of the vertical adjustment plate 1230 is supported on the lower end side of the focus plate 1220 via an eyelid spring 1231, and the upper end side is a pair of left and right alignment adjustment screws 1232, 123 attached to the focus plate 1220.
Pushed downwards by 3. Therefore, by adjusting the screwing amounts of the pair of adjusting screws 1232 and 1233, the vertical adjusting plate 1230 is moved to the focus plate 122.
It can be moved up and down relatively to zero.

A horizontal adjustment plate 1240 is supported on the vertical adjustment plate 1230 in parallel with the vertical adjustment plate 1230. The horizontal adjustment plate 1240 is pushed by one side of the left and right by the alignment adjustment spring 1241 and the other side is pushed by one alignment adjustment screw 1242. Therefore, the horizontal adjusting plate 1240 can be moved laterally relative to the vertical adjusting plate 1230 by adjusting the screwing amount of the screw 1242. A light valve unit 1250 to which a liquid crystal light valve 925R is attached is fixed to the central portion of the horizontal adjustment plate 1240.

The light valve block 1200 having this configuration
After fixing this to the head plate bottom wall 92, while adjusting the lower adjustment plate 1210 back and forth along the optical path direction,
By pivoting the focus plate 1220 around a vertical line about the dowel 1224, the focus position of the light bubble 925R, that is, the optical path direction can be easily positioned. Further, by moving the vertical adjustment plate 1230 and the horizontal adjustment plate 1240 vertically and horizontally, alignment adjustment of the write bubble 925R can be performed.

Here, the write bubble block 12 of the present example.
00, three plates, that is, a focus adjusting plate 1220, a vertical adjusting plate 1230 and a horizontal adjusting plate 12
40 are fixed by U-shaped adjustment plate fixing springs 1260 at a total of three positions, that is, a substantially central portion on the left and right and a central portion on the upper end. As before, these three plates are
Unlike the case where the fixing spring is used for fixing, there is an advantage that an operation such as loosening the fixing screw is unnecessary when performing focusing or the like, and the adjustment can be performed with the fixing spring 1260 attached. Also, after positioning, if the three screws are fixed by tightening the fixing screws as in the conventional case, there is a risk that the three plates whose bending angles have been adjusted may be displaced due to the tightening operation. Since no special operation is required, there is no risk of the three plates shifting after adjustment. However, in order to completely integrate the three plates after positioning, in this example, the upper end portions of the three plates are
An adhesive reservoir 1270 is formed. This adhesive reservoir 127
At 0, after the alignment of the three plates is completed, an adhesive is poured in and these are adhesively fixed.

(Structure of Foot for Height Adjustment) FIGS.
The height adjusting feet 31R and 31L are shown in FIG. Since both of these feet have the same shape and the height adjusting mechanism is also the same, one foot 31L
Will be described. The foot 31L includes a disk-shaped foot body 311 exposed from the lower end of the front case 5 of the apparatus, and a shaft 31 extending coaxially from the upper end.
Have two. The shaft 312 is supported in a vertically movable state by a foot adjuster plate 313 fixedly supported by the lower case 4, and a male screw 317 is formed on the outer periphery of the shaft 312 over substantially the entire length.

A plate-shaped foot stopper 314 is integrally formed on the back side of the foot stopper button 32L exposed to the front from the lower end of the front case 5. The foot stopper 314 is formed with a through portion 315 through which the shaft 312 passes. Furthermore, the foot stopper spring 316 always pushes the foot stopper 314 toward the front side of the apparatus. Therefore, the button 32L on the front side of the foot stopper 314 is always held in a state of protruding forward from the front case 5. In this state, the foot stopper 314
A part of the inner peripheral surface of the penetrating portion 315 hits the outer peripheral surface of the shaft 312 with a predetermined pressure. On the inner peripheral surface of this penetrating portion, a female screw 31 that can be screwed into the male screw 317 of the shaft.
8 are formed.

The height adjusting foot 31L of this structure is prevented from moving up and down by the spring 316. However, when the button 32L is pushed in against the spring force, the foot stopper 314 is disengaged from the shaft 312. As a result, the foot 31L can freely move up and down along the foot adjuster plate 313. Therefore, if the device 1 is lifted with both hands and the left and right buttons 32L and R are pressed,
Since the feet 31L and 31R fall by their own weight, the feet can be pulled out by a predetermined length. After this,
If the buttons 32L and 32R are released while the foot is pulled out by the target length, the foot is fixed at that position.

After that, when the foot itself is rotated, the shaft 312 of the foot is rotated and the screw 318 on the stopper 314 side is moved.
A small movement up and down along. Therefore, the button 32
The length of the foot 31L, R roughly adjusted by pressing L, R can be finely adjusted by rotating the foot itself. In this way, in this example, the height adjustment on the front end side of the device 1 can be performed by a simple operation and in a short time, and the device 1 can be set to a desired inclination angle.

(Handle Mounting Structure) The handle 38 mounting structure will be described with reference to FIG. Handle 3
Reference numeral 8 denotes a handle storage recess 3 formed on the side surface of the device 1.
It is stored in e. The handle 38 can be pivoted around the pair of lower end portions 38a and 38b to be pulled out sideways. In this example, the bearing portion of the rotating shaft 381 of the handle is formed by combining the side wall 3b of the upper case and the side wall 4b of the lower case. In addition, the lower end portions 38a, 38 of the handle
A projecting surface 383 that slightly projects is formed on the peripheral surface of b. By this protruding surface 383, the handle 38 is fixed with a predetermined restraining force to the storage position shown by the solid line in FIG. 17A and the drawing position shown by the imaginary line.

[0086]

As described above, in the projection type display device of the present invention, the lamp case of the light source lamp unit which is the heat source is provided, and the vent hole for introducing the cooling air to the front surface in the optical axis direction. Is formed, an exhaust port is formed on the rear surface in the optical axis direction, and the left, right, upper, and lower peripheral surfaces are substantially closed. In addition, an arrangement is adopted in which the suction side of the exhaust fan is located behind the exhaust port formed in this lamp case. Therefore, according to the present invention, at least a part of the air flow introduced into the device from the intake fan is
It flows along the optical axis from the ventilation port side of the front of the lamp case into the inside, passes around the light source lamp arranged in the lamp case, and exhausts from the exhaust port formed on the rear side. It is sucked to the fan side and discharged to the outside. In this way, since the cooling air flow flows into the lamp case along the optical axis direction and flows along the periphery thereof,
It is possible to efficiently cool the internal light source lamp, reflector, etc.

Further, in the present invention, an auxiliary intake fan for forcibly introducing cooling air into the power supply unit, which is a heat source, and an air introduced into the unit by this auxiliary intake fan are provided. It uses a structure with a discharge port that discharges to the outside of the unit. Therefore, even if the power supply unit is a closed space covered with a shield case or the like, it is possible to allow sufficient air to flow inside and sufficiently cool the space.

Further, in the present invention, the air intake port is formed in the bottom wall of the outer case, and the intake fan is arranged immediately above the air intake port so that the cooling air flow is generated upward. In addition, a second auxiliary intake port is formed on the upper wall of the exterior case corresponding to the position of the intake fan. And these second
The optical lens unit is located between the intake port and the intake fan, and the outside air introduced from the second intake port is guided to the suction side of the intake fan in the optical unit.
An air flow passage for guiding the air blown out from the intake fan to the second intake port side is formed. With this configuration, even if the suction side intake port of the intake fan is clogged, sufficient intake air can be introduced from the second auxiliary intake port. Therefore, the inside can always be sufficiently cooled. Here, if the periphery of the suction fan is covered with a sealing plate and an air passage for guiding the air that has passed through the optical lens unit to the suction side of the intake fan is defined, a smooth air flow can be formed. is there.

[Brief description of drawings]

FIG. 1 is a diagram showing an external shape of a projection display device which is an embodiment of the present invention.

2A and 2B are diagrams showing an arrangement of respective parts inside the apparatus of FIG. 1, FIG. 2A is a diagram showing a planar arrangement thereof, and FIG. 2B is a diagram showing a stereoscopic arrangement thereof.

3A and 3B are views showing an optical lens unit and a projection lens unit taken out, wherein FIG. 3A is a schematic plan configuration diagram thereof, and FIG. 3B is a schematic sectional configuration diagram thereof.

4A and 4B are views showing a head plate, a prism unit, and a projection lens unit taken out, wherein FIG. 4A is a schematic plan view thereof, and FIG. 4B is a schematic sectional view thereof.

FIG. 5 is a diagram showing a light valve block, (a)
Is a plan view thereof, (b) is a front view thereof, and (c) is a side view thereof.

FIG. 6 is a schematic front view showing the shape of a head plate.

FIG. 7 is a schematic cross-sectional configuration diagram showing a configuration of a light source lamp unit.

FIG. 8 is an explanatory diagram showing a planar flow of a cooling air flow.

FIG. 9 is an explanatory diagram showing a three-dimensional flow of a cooling air flow.

FIG. 10 is an explanatory diagram showing a three-dimensional flow of a cooling air flow.

FIG. 11 is an explanatory diagram showing the arrangement of substrates.

FIG. 12 is an explanatory diagram showing the arrangement of substrates.

FIG. 13 is an explanatory diagram showing the arrangement of substrates.

FIG. 14 is a partial cross-sectional view showing the structure of a height adjusting foot.

FIG. 15 is a partial cross-sectional view showing the structure of a height adjusting foot.

FIG. 16 is a partial cross-sectional view showing a fixing structure of an upper case and a lower case.

FIG. 17 is a partial cross-sectional view showing the structure of a handle attaching portion.

18 is an explanatory diagram showing the position of the center of gravity of the device of FIG. 1. FIG.

19 is a schematic configuration diagram of an optical system incorporated in the apparatus of FIG.

FIG. 20 is an explanatory diagram showing an example of displacement of the prism unit.

FIG. 21 is an explanatory diagram for explaining a conventional method of attaching a prism unit.

FIG. 22 is an explanatory diagram for explaining a method of bonding the prism units of this example.

FIG. 23 is an explanatory view showing the shape of a prism unit fixing plate.

FIG. 24 is an explanatory diagram showing a preferable example of the prism unit.

[Explanation of symbols]

 1 Projection Display Device 1a Optical Axis 2 Exterior Case 3 Upper Case 4 Lower Case 6 Projection Lens Unit 7 Power Supply Unit 7a Vent Hole 704 Power Unit Fixing Screw 8 Light Source Lamp Unit 802 Lamp Case 804a, 808 Vent Hole 807 Vent Hole 9 Optics Lens unit 903 Head plate 910 Prism unit (color combining means) 924 Color separation means 925R, 925G, 925B Light valve 15 Intake fan 16 Exhaust fan 17 Auxiliary intake fan 24 Vent hole (air exhaust port) 28 Vent hole (cooling air intake) Port) 43 exhaust port 1100, 1120, 1130, 1140 air flow 1150 sealing plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinaga Koide 3-3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation (72) Inventor Toshiaki Hashizume 3-5 Yamato, Suwa City, Nagano Prefecture Seiko -In Epson Corporation

Claims (7)

[Claims] 1. A light source lamp unit, an optical lens unit for optically processing a white light flux emitted from the light source lamp unit to form an optical image corresponding to image information, and an optical image formed here is magnified on a screen. In a projection display device having a projection lens unit for projecting and a power supply unit, a cooling air intake port formed in a device exterior case, an intake fan for introducing outside air into the case from here, and an intake fan introduced into the case An air exhaust port formed in the device exterior case for exhausting air to the outside, and an exhaust fan exhausting the internal air to the outside through the air exhaust port, the lamp case of the light source lamp unit, A vent is formed on the front side in the optical axis direction, an exhaust port is formed on the rear side in the optical axis direction, and the left, right, upper, and lower peripheral surfaces are substantially closed. The suction side of the exhaust fan is located behind the exhaust port formed in the lamp case, and at least a part of the airflow introduced into the device from the intake fan is directed along the optical axis of the lamp case. It flows into the inside from the side of the vent on the front side, passes around the light source lamp arranged in the lamp case,
A projection display device, characterized in that it is adapted to be sucked toward the exhaust fan side from the exhaust port formed on the rear side and discharged to the outside. 2. The power supply unit according to claim 1, wherein the power supply unit has an auxiliary intake fan for forcibly introducing cooling air into the power supply unit, and the air introduced into the unit by the auxiliary intake fan to the outside of the unit. The auxiliary air intake fan forcibly introduces at least a part of the airflow introduced into the device from the intake fan into the power supply unit, and the inside of the unit and A projection display device, wherein the projection display device is adapted to be sucked to the exhaust fan side through the discharge port and discharged to the outside. 3. The air intake according to claim 1 or 2, wherein the air intake is formed in a bottom wall of the outer case, the intake fan is arranged directly above the air intake, and cooling air is directed upward. A second intake port is formed on the upper wall of the outer case corresponding to the position of the intake fan, and a second intake port is formed between the second intake port and the intake fan. Is provided with the optical lens unit, and the optical unit guides the outside air introduced from the second intake port to the suction side of the intake fan, and the air blown out from the intake fan is introduced into the second optical unit. The projection display device is characterized in that an air flow passage is formed to be guided to the intake port side of the projection display device. 4. The air passage according to claim 3, wherein a periphery of the suction fan is covered with a sealing plate, and an air passage for guiding air dropped through the air flow passage of the optical lens unit to a suction side of the intake fan is provided. A projection display device characterized by being partitioned. 5. A light source lamp unit, an optical lens unit that optically processes a white light flux emitted from the light source lamp unit to form an optical image corresponding to image information, and an optical image formed here is magnified on a screen. In a projection display device having a projection lens unit for projecting and a power supply unit, a cooling air intake port formed in a device exterior case, an intake fan for introducing outside air into the case from this, and an intake fan introduced into the case The air conditioner has an air discharge port formed in the device outer case for discharging air to the outside, and an exhaust fan discharging the internal air to the outside through the air discharge port. The auxiliary intake fan for forcibly introducing the working air and the exhaust port for discharging the air introduced into the unit by this auxiliary intake fan to the outside of the unit. At least a part of the airflow introduced into the device from the intake fan is forcibly introduced into the power supply unit by the auxiliary intake fan, and is passed through the inside of the unit and the exhaust port. A projection display device, wherein the projection display device is adapted to be sucked toward the exhaust fan and discharged to the outside. 6. A light source lamp unit, an optical lens unit that optically processes a white light flux emitted from the light source unit to form an optical image corresponding to image information, and an optical image formed here is magnified on a screen. In a projection display device having a projection lens unit for projecting and a power supply unit, a cooling air intake port formed in a device exterior case, an intake fan for introducing outside air into the case from this, and an intake fan introduced into the case It has an air discharge port formed in the device outer case for discharging air to the outside, and an exhaust fan for discharging the internal air to the outside through the air discharge port, and the air intake port of the outer case. The intake fan is formed on the bottom wall, and the intake fan is arranged immediately above the air intake port, and is configured to generate an air flow for cooling upward. A second intake port is formed on the upper wall of the outer case corresponding to the position of the intake fan, and the optical lens unit is disposed between the second intake port and the intake fan. The unit has an air flow passage that guides the outside air introduced from the second intake port to the suction side of the intake fan and guides the air blown from the intake fan to the second intake port side. A projection display device characterized by being formed. 7. The air passage according to claim 6, wherein the periphery of the suction fan is covered with a sealing plate, and an air passage for guiding the air descending through the air flow passage of the optical lens unit to the suction side of the intake fan is provided. A projection display device characterized by being partitioned.