JP2003262916A - Projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the height of a projection type display device in a short time through an easy operation. <P>SOLUTION: A foot 31L for height adjustment is inhibited by a spring 316 from moving up and down. When a button 32L is pressed while lifting the device 1 by both hands, since the foot 31L automatically falls, the foot can be drawn out by a specified length. Then the button 32L is released with the foot drawn out by target length and then the foot is fixed at the position. When the foot itself is swiveled, on the other hand, a shaft 312 moves up and down finely along a screw 318 on the side of a stopper 314. Consequently, the length of the foot 31L which is roughly adjusted with the button 32L pressed can finely be adjusted by rotating the foot itself. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system for optically processing a light beam emitted from a light source to form an optical image corresponding to image information, and a projection lens for enlarging and projecting the optical image formed here. The present invention relates to a projection-type display device provided with. 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 unit that optically processes a light flux emitted from the light source so that a color image corresponding to image information can be synthesized, and a projection lens unit that projects the synthesized light flux on a screen. And a circuit board group on which 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.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to realize a projection type display device capable of height adjustment by a simple operation and in a short time.

[0004]

The projection display device of the present invention is an optical system for optically processing a light beam emitted from a light source to form an optical image corresponding to image information, and an optical system formed here. A projection type display device having a projection lens for enlarging and projecting an optical image, an exterior case for accommodating the optical system and the projection lens system, and a height adjusting foot, wherein the height adjusting foot is provided. Has a shaft that can be moved up and down, and a foot stopper integrally formed with a foot height adjusting button, and a screw is formed on the outer periphery of the shaft. A through hole through which the shaft penetrates is formed, a screw that can be screwed into a screw of the shaft is formed on the inner peripheral surface of the through hole, and the inner peripheral surface of the through hole is Apply a predetermined pressure to the outer peripheral surface of the shaft. By doing so, the vertical movement of the shaft is prohibited, and by operating the foot height adjustment button, the vertical movement of the shaft can be switched between released and fixed, whereby the height can be adjusted. Stepped portions are formed on the left and right bottom walls of the front of the case, the height adjusting feet are arranged at the front left and right corners of the exterior case, and the height adjusting buttons are A projection display device arranged in front of the outer case and protruding from the outer case.

Further, in the projection type display device of the present invention, a protrusion is provided at the rear center part of the outer case, and the projection type display device is provided with the protrusion and the height adjusting foot. It is desirable that it is point-supported.

[0006]

According to the projection display apparatus of the present invention, the height of the apparatus can be adjusted by a simple operation and in a short time.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A projection type display device which is 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 exterior 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 unit 9 are arranged at a position adjacent to the front side of the device. Optical unit 9
The base end side of the projection lens unit 6 is located at the center of the front side of the. On the other hand, on one side of the optical unit 9, an interface board 11 on which an input / output interface circuit is mounted is arranged in the front-rear direction of the device, and in parallel to this, a video board 12 on which a video signal processing circuit is mounted is installed. It is arranged. Further, on the upper side of the light source lamp unit 8 and the optical unit 9, a control board 13 for device drive control is provided.
Are arranged. 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 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. 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 of the power supply unit 7 that faces the ends of the substrates 11 and 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 center and on the front side. 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 a 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 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 both side walls 3c and 4c of the upper case and the lower case which define the opposite side surface of the apparatus so as to extend over both of them. 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 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 Unit) In the optical unit 9, the optical elements other than the prism unit 910 constituting the color combining means are arranged between the upper and lower light guides 901 and 902 having the shape shown in FIG. It is sandwiched and held from above and below. These top light guides 90
The lower light guide 902 and the lower light guide 902 are fixed to the upper case 3 and the lower case 4 by fixing screws. Also, these upper and lower light guide plates 90
Nos. 1 and 902 are also fixed to the prism unit 910 side by fixing screws. Prism unit 91
0 is fixed to the back surface side of the thick head plate 903 which is a die cast plate by a fixing screw. This head plate 9
The base end side of the projection lens unit 6 is similarly fixed to the front surface of 03 by a fixing screw. Therefore, in this example, the head plate 903 is sandwiched between the prism unit 910 and
The projection lens unit 6 and the projection lens unit 6 are integrally fixed. The head plate 9 having such high rigidity
Both of these parts are integrated by sandwiching 03.
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
The light source lamp 805, an illumination optical system 923 including integrator lenses 921 and 922 that are uniform illumination optical elements, and a light beam W emitted from the illumination optical system 923 are converted into red, green, and blue light beams R. , G, B color separation optical system 924, and three liquid crystal light valves 925R, 925 as light valves for modulating each color light flux.
G, 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.
Composed of. 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. The light flux W is first reflected by the blue-green reflection dichroic mirror 941 at right angles to the blue light flux B and the green light flux G contained therein, and travels toward the green reflection dichroic mirror 942. 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. With respect to the blue and green light beams B and G reflected by the mirror 941, only the green light beam G is reflected at a right angle by the green reflection dichroic mirror 942, and the green light beam is emitted from the emission part 945 of the green light beam to the color combining optical system side. It 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, the distances from the light emitting portion of the uniform illumination optical element to the light emitting portions 944, 945, 946 of the respective color light beams in the color separation optical system 924 are all 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 light fluxes R, G, of the respective colors thus collimated
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 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 that a half-wave plate is arranged 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 bonded 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, 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 the present example thus bonded together has the orthogonal alignment surfaces 910f and 910 formed on the upper end of the prism 910c.
By using j, the optical unit 9 is mounted at a predetermined mounting position as described below, thereby accurately positioning the optical unit 9.

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.
And paste it. 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 filter 912 described above, a filter for absorbing the red light flux may be attached to the incident surface side 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 thereof 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 this 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.

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 arranged adjacent to 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 each substrate 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 connection between the substrates is 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. 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 with the highly rigid vertical wall 91 sandwiched and aligned, the integrity of these 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.

As described above, in this example, the rear case portions of the upper case 3 and the lower case 4 are fixed to the power supply unit 7, and the front end portions thereof are fixed to the head plate 903, as described above. 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 by the cooling suction fan 15 from the outside through the ventilation hole 28 formed in the bottom wall 4a of the device 1 passes through the inside of the optical unit 9 and is disposed on the right side surface of the device. It is again discharged to the outside by 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 unit 9 and seen in a plan view, and then the exhaust fan 1 is straightened.
It reaches 6 and is discharged to the outside through this.

Another air flow 1120 is from the optical unit 9 to the front side of the light source lamp unit 8, a vent hole 804a formed in the outer housing 804 and a vent hole 80 formed in the inner housing 803.
It goes into the inside through 8. 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 unit 9 by the auxiliary suction fan 17 attached to the end of the power supply unit 7, and is drawn into the power supply unit 7. After passing through the inside, it is sucked by the exhaust fan 16 from the other end side and discharged to the outside.

FIG. 9 shows a 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 airflow 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 unit 9 on the incident side and the emitting side. Then, through a vent hole formed in the upper light guide 901, it enters between the upper surface and the back surface of the upper wall 3a of the upper case, and flows in the lateral direction between them. Next, the upper light guide 9
The lower light guide 90 is moved down through the vent hole formed in 01 to lower the portion of the optical unit 9 where the integrator lenses 921 and 922, which are uniform illumination optical elements, are arranged.
It goes around from the ventilation hole opened in 2 to the lower side, and then is introduced into the power supply unit 7 through the suction fan 17. After that, the gas flows to the exhaust fan 16 side and is discharged to the outside via this.

As described above, 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 hole 24 is 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 ventilation hole 24 when the lower ventilation 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.

In this way, 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, with reference 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 3
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 at 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.
It is rotatably supported by 10. 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 is 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 adjusting plate 1240 is supported on the vertical adjusting plate 1230 in parallel with the vertical adjusting 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 structure
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 from the lower end of the front case 5 to the front. 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 is formed.

The height adjusting foot 31L of this structure is prohibited 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.

Thereafter, 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.

[0079]

As described above, according to the projection display device of the present invention, the projection display device of the present invention enables height adjustment of the device by a simple operation and in a short time. Become.

[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 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 view showing a light valve block,
(A) is the top view, (b) is the front view, (c) is the side view.

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

FIG. 7 is a schematic 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 attachment portion.

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

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 diagram 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 supply unit fixing screw 8 Light source lamp unit 802 lamp case 804a, 808 ventilation holes 807 ventilation holes 9 Optical 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 (air outlet) 28 Vents (cooling air intake) 43 Exhaust port 1100, 1120, 1130, 1140 Air flow 1150 Sealing plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomiyoshi Ushiyama             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation (72) Inventor Akinaga Koide             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation (72) Inventor Toshiaki Hashizume             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation F term (reference) 2K103 AA16 CA06 CA33 CA34 DA06                       DA09

Claims (2)

[Claims] 1. An optical system for optically processing a light beam emitted from a light source to form an optical image corresponding to image information, a projection lens for magnifying and projecting the optical image formed here, and the optical system. A projection type display device comprising: an outer case for accommodating the projection lens system and a height adjusting foot, wherein the height adjusting foot includes a shaft that can move up and down, and a foot height. A foot stopper integrally formed with the adjustment button; a screw is formed on the outer periphery of the shaft; and a through hole through which the shaft penetrates is formed in the foot stopper. The inner peripheral surface of the through hole is formed with a screw that can be screwed into the screw of the shaft, and the inner peripheral surface of the through hole hits the outer peripheral surface of the shaft with a predetermined pressure, Vertical movement of the shaft Is prohibited, and by operating the foot height adjustment button, the vertical movement of the shaft is switched between being released and fixed, whereby height adjustment is possible, and the left and right bottom walls in front of the outer case are A stepped portion is formed, the height adjusting feet are arranged at the front left and right corners of the outer case, and the height adjusting button is arranged in front of the outer case. A projection display device, wherein the projection display device projects from the outer case. 2. The projection according to claim 1, wherein a protrusion is provided in a rear center portion of the outer case, and the projection display device is supported at three points by the protrusion and the height adjusting foot. A projection display device characterized in that