JP3379257B2 - Projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTIONLight emitted from the light source
Optically process bundles to form optical images corresponding to image information
Optical system and enlarges and projects the optical image formed here
A projection lens and an outer case for housing the optical system,
HaveThe present invention relates to a projection display device. Further details
In other words, the present invention makes the inside of such a projection display device efficient.
The present invention relates to a cooling mechanism for cooling well. [0002] 2. Description of the Related Art A projection display device basically includes the following components.
It is composed of That is, the light source lamp unit
And the white luminous flux emitted from the
Optical lens that processes optically so that color images can be synthesized
Lens unit and the luminous flux synthesized here on the screen
Lens unit, power supply unit,
It is a group of circuit boards on which a control circuit and the like are mounted. Projection lens unit
Each of these parts, except for the knit, is placed inside the equipment outer case
Have been. The projection lens unit is generally located in front of the device.
It is mounted in a state protruding from the surface. Outer case
On the surface, operating members such as a power switch, remote control
A light receiving window for a roll and the like are arranged. In this type of projection display device, the internal heat generation
Cool the light source lamp unit, power supply unit, etc.
The cooling mechanism for this is incorporated. In general, outside
The outside air is introduced by the intake fan from the vent of the
After flowing outside air through the internal heat source,
Empty from the exhaust port formed in the outer case by the exhaust fan
I try to discharge the energy to the outside. [0004] SUMMARY OF THE INVENTION A portable projection display device is provided.
The compact and compact construction is convenient for
The space between the cooling air becomes narrow, and it is not possible to secure
There are times. Also, power supply units etc.
Although it is desirable to cover with a shield plate to prevent
, The inside of the power supply unit is isolated from other parts
Space. For this reason, cooling inside the power supply unit
The cooling air does not flow sufficiently, resulting in inefficient cooling
Also. Furthermore, in the open air inlet of the outer case
If clogging occurs, direct sufficient outside air into the unit.
Because the cooling operation is not sufficient
appear. The object of the present invention is to focus on such points.
To efficiently cool each part inside the device
To realize a projection display device with a cooling mechanism
You. [0006] SUMMARY OF THE INVENTION A projection display apparatus according to the present invention.
Is the cooling air intake formed in the outer case.
An intake fan that introduces outside air into the case
The outer casing is used to exhaust air introduced inside the housing to the outside.
Air outlet formed in the base and through this air outlet
An exhaust fan that exhausts the internal air out of the outer case
Have. And the light source is a lamp and a reflector
And a lamp case for holding the light source.
Having the lamp caseUpper frontHas a vent formed
An exhaust port is formed on the rear side of the case,
The suction side of the exhaust fan is located behind the vent.
The front side is the light emission side of the lamp,
The rear side is the side opposite to the light emitting side of the lamp,
Introduced inside the outer case by the intake fan
At least a part of the airflow is supplied to the lamp case.In front of
DepartmentFrom the vent formed in theDirectly above the lamp
And the rifle flows from inside the reflector
Flows along the outside of theThe exhaust port is connected to the exhaust port.
And is discharged outside the outer case.
It is characterized in that it is. [0007] [0008] [0009] [0010] [0011] According to the projection type display device of the present invention, the intake fan
At least some of the airflow introduced inside the device is
Along the lamp caseLight source directly from the upper front vent
Flows toward the upper side of the reflector, from the inside of the reflector to the outside
To the lamp caseThe drain formed on the rear side
The air is sucked into the exhaust fan side and exhausted to the outside.
It is. In this way, the cooling air flow is distributed along the optical axis direction.
Pump caseFrom the upper front directly above the hot light source
Inflow, flowing from inside to outside of the reflector
SoEfficient internal light source lamps, reflectors, etc.
Is cooled. [0012] [0013] [0014] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A projection type display device will be described. (Overall Configuration) FIG. 1 shows a projection type display device of this embodiment.
The appearance of the device is shown. The projection display device 1 of this example is
The outer case 2 has a rectangular shape. Outer case
2 is basically an upper case 3 and a lower case
4 and a front case 5 defining the front of the device.
Has been established. Projection lens from center of front case 5
The portion on the distal end side of the closing unit 6 protrudes. FIG. 2 shows an outer case of the projection display device 1.
2 shows the arrangement of each component in the interior of the apparatus. this
As shown in FIG.
A power supply unit 7 is arranged on the end side. Than this
At a position adjacent to the front of the device, the light source lamp unit 8 and
And an optical lens unit 9. Optical lens
The projection lens unit 6 is located at the front center of the
Is located on the proximal side. On the other hand, the optical lens unit 9
The input / output interface on one side of the
Interface board 11 on which the base circuit is mounted
In parallel with this, a video signal processing circuit was mounted
A video board 12 is arranged. In addition, the light source lamp
The device drive is located above the unit 8 and the optical lens unit 9.
A control board 13 for motion control is provided. Equipment front end
Speakers 14R and 14L are provided at the left and right corners of
Is placed. The center of the back surface of the optical lens unit 9 is cold
The air intake fan 15 is arranged, and the light source lamp unit
An exhaust fan 16 is arranged on the side of the device, which is the back side
Have been. Then, the substrate 11 in the power supply unit 7,
In the position facing the end of 12, cooling from the intake fan 14
Cooling for drawing air flow into power supply unit 7
A fan 17 is provided. (Structure of Outer Case) As shown in FIG.
The upper case 3 of the outer case 2 has a rectangular upper wall 3a.
And extend almost vertically downward from the three sides except the front side
Left and right side walls 3b, 3c and rear wall 3d.
Have been. Similarly, the lower case 4 has a rectangular bottom wall 4.
a, and stand almost vertically from the three sides except the front side.
Left and right side walls 4b, 4c and a rear wall 4d.
ing. In the front case 5, the center part is slightly forward
It is curved in a convex state, and an annular rim 5a is
A circular opening 5b formed in the enclosure is open,
Therefore, the front end portion of the projection lens unit 6 is in front of the apparatus.
Extends to the side. Upper case 3 and lower case 4
Are fixed at two positions on each side wall
By means of screws 21a, 21b and 22a, 22b
They are connected (see FIG. 16). The front case 5
Upper case 3 and lower case 4
It is held in a state sandwiched between. The upper wall 3a of the upper case 3 has
An air filter cover 23 is attached to the center front position
Have been killed. Many air holes are formed in this cover 23
It is inside this, from outside through here dust etc.
Air filter 24 to prevent air from entering.
(See FIG. 2B). In front of this upper wall 3a
At the left and right ends on one side, the built-in speakers 14R and 14L
A number of communication holes 25R and 25L are formed at corresponding positions.
ing. An operation switch is provided at the left end of the upper wall 3a.
A hitch lid 26 is attached. This operation switch lid
Reference numeral 26 designates one end as a center as shown in FIG.
Can be opened and closed. When this lid 26 is opened,
Many operation switches 26a arranged inside are exposed.
(See FIG. 17B). The lower case 4 has a built-in bottom wall 4a.
Lamp at the position corresponding to the light source lamp unit 8
A replacement lid 27 is attached. This replacement lid 27 is attached to the lower wall 4
a, and loosen the screw to remove the lid 27
The built-in light source lamp unit 8 can be replaced.
You. At a position on the front side of the replacement lid 27, a ventilation hole 28 is provided.
Is formed. This ventilation hole 28 has a built-in cooling
It is formed at a position corresponding to the intake fan 15. this
The air filter 29 (see FIG.
(Refer to (b))), from which dust etc. enter
To prevent them from doing so. Height adjustment is provided at the left and right corners of the front end of the bottom wall 4a.
Foot 31 (31R, 31L) is arranged. This
These feet 31 can be fine-tuned in height by turning them
And project from the lower part of both ends of the front case 5
The height adjustment button 32 (32R, 32L)
By adjusting the height of these feet 31 roughly,
(Coarse adjustment). Rear end of bottom wall 4a
A projection 33 is formed at the center of the side.
And the two feet 31 support the device 1 at three points
It is set on a table or the like in a state where it has been set. In addition, on the installation surface
To prevent the device from rattling when there are irregularities,
Auxiliary projections 34R and 34L are also formed at both ends on the rear end side of the bottom wall.
Have been. On the other hand, a front case defining the front of the apparatus
Defines the upper right position of the right side of the case 5 and the upper half of the rear surface of the device
At the center position of the rear wall 3d of the upper case 3
Light receiving windows 35F and 35R are arranged respectively. This
These light receiving windows receive control light from the remote controller.
It is for opening. Thus, in this example, in front of the device
Since the receiving window is formed later, the front and back of the device
Remote control from any side of
So convenient. A lower defining the lower half of the rear surface of the device.
The rear wall 4d of the case 4 has an external power
AC inlet 36 for power supply and main power switch
37 are arranged. On the left side of the device is a portable handle 38
Is installed. The two proximal ends of this handle 38
38a and 38b are the upper case 3 and the lower
Rotatable around the mating surface of the side walls 3b, 4b of the base 4
Installed. On the side wall 3b on the upper case side,
A recess 3e for storing the handle is formed, and
The handle 38 can be stored. Also the side wall
At the upper end of 3b, an operation state of the device is displayed.
An LED display unit 39 is provided. On the lower case side
An input / output end that can be opened and closed about the lower end is provided on the side wall 4b.
A child lid 41 is attached. When you open this, inside
Many input / output terminals 42 arranged are exposed (FIG. 1
7 (a)). An upper defining the opposite side of the device
-The side walls 3c and 4c of the case and the lower case
The exhaust hole 43 is formed in a state in which both of them are crossed.
You. An air filter is provided on the back side of the exhaust hole 43 through an air filter.
An exhaust fan 16 for cooling is located. (Light source lamp unit) FIGS.
The light source lamp unit 8 will be described with reference to FIG.
You. The light source lamp unit 8 includes a light source lamp 801 and
Lamp housing 8 having a substantially rectangular parallelepiped shape
02. In this example, the lamp housing
802 is an inner housing 803 and an outer housing
804 has a double structure. Light source lamp 801
Is a lamp body 805 such as a halogen lamp,
And the lamp body 805
Directs light along the optical axis 1a toward the optical lens unit 9
Out. The outer housing 804 is in the direction of the optical axis 1a.
Has an opening at the front, and has an ultraviolet filter 8
09 is attached. On the back surface in the direction of the optical axis 1a,
A large number of slit groups 807 for passage of the reject air are formed.
You. The inner housing 803 is provided for the light source lamp 801.
It is mounted on the front surface, and the portion through which the emitted light passes is an opening.
In addition, a cooling air passage hole 80
8 are formed. In this example, this inner how
Jing 803 and light source lamp 801 are integrally formed.
You. When replacing the lamp, attach and detach
It is configured as follows. (Optical lens unit) Optical lens unit
The prism 9 is a prism unit constituting the color synthesizing means.
Optical elements other than 910 have the shape shown in FIG.
Between the upper and lower light guides 901 and 902 from above and below.
It is a rarely held configuration. These top lights
The guide 901 and the lower light guide 902 are
Fixing screws on upper case 3 and lower case 4
More fixed. Also, these upper and lower light guides
The plates 901 and 902 are located on the side of the prism unit 910.
It is also fixed by fixing screws. Prism Uni
910 is a thick head plate 9 which is a die-cast plate.
03 is fixed to the back surface side by a fixing screw. This
The base end of the projection lens unit 6 is
The sides are also fixed by fixing screws. Accordingly
Therefore, in this example, the head plate 903 is interposed and the prism unit is sandwiched.
910 and the projection lens unit 6
It has a fixed structure. This high rigidity
These two parts are integrated with the pad plate 903 interposed therebetween.
ing. Therefore, impact or the like of the projection lens unit 6
Side, there is a misalignment of both of these members
Nothing to do. (Optical System) Here, the optical system is incorporated in this embodiment.
The optical system will be described. FIG. 19 shows the projection type table of this example.
Only the optical system of the indicating device 1 is shown. The optical system of this example is
The light source lamp 805 and the uniform illumination optical element a
Illumination composed of the integrator lenses 921 and 922
The optical system 923 and the light emitted from the illumination optical system 923
Separates white light beam W into red, green and blue light beams R, G and B
Color separation optical system 924 and a light for modulating each color light beam
Three liquid crystal light valves 925R and 92 as valves
5G, 925B, and color shade for recombining modulated color light flux
Combined with a prism unit 910 as a forming optical system
Projection lens unit that enlarges and projects the light beam on the screen
6 is comprised. Also, by the color separation optical system 924,
Among the separated color light beams, a blue light beam B corresponds to a corresponding liquid crystal.
A light guide system 927 for guiding to the bulb 925B is provided. As the light source lamp 805, a halogen lamp
Lamps, metal halide lamps, xenon lamps, etc.
be able to. The uniform illumination optical system 923 includes the reflection mirror 9.
31 and the central light of the light emitted from the illumination optical system.
The shaft 1a should be bent at a right angle toward the front of the device.
ing. With this mirror 931 in between, the integrator lens
921 and 922 are arranged in a state of being orthogonal to the front and rear.
You. The color separation optical system 924 is a blue-green reflecting dichroic
Mirror 941 and a green reflecting dichroic mirror 94
2 and a reflection mirror 943. White luminous flux W
First, smell the blue-green reflective dichroic mirror 941
And the blue light beam B and the green light beam G contained therein
Reflected at a right angle, the green reflecting dichroic mirror 942
Head towards. The red light flux R passes through this mirror 942
Is reflected at a right angle by the rear reflection mirror 943, and is reflected in red.
From the light beam emitting section 944 to the prism unit 910 side
Is emitted. Blue reflected at mirror 941 and
The green luminous fluxes B and G are a green reflection dichroic mirror 942
, Only the green luminous flux G is reflected at a right angle,
The bundle is emitted from the bundle emission unit 945 to the color combining optical system side.
The blue luminous flux B passing through the mirror 942 is
The light is emitted from the emission unit 946 to the light guide system side. In this example,
Color separation optics from the emission part of the white luminous flux of the uniform illumination optical element
Emission parts 944, 945, 9 for the respective color light beams in the system 924
The distances to 46 are all set equal.
You. The emission section 9 of each color light beam of the color separation optical system 924
44, 945 and 946 are provided on the exit side, respectively.
951, 952, and 953 are arranged. Accordingly
Therefore, each color light beam emitted from each emission part is
Are incident on the lenses 951, 952, and 953 and are collimated. Each color light beam R, G,
Among B, red and green luminous fluxes R and G are liquid crystal light bars.
Lubes 925R and 925G are modulated and output to each color light.
Corresponding video information is added. That is, these la
The light valve responds to video information by driving means (not shown).
Switching is controlled by the
The modulation of each color light is performed. This Yuna drive means is known
Can be used as it is. On the other hand, blue light
The bundle B is connected to the corresponding liquid crystal light valve via the light guide system 927.
925B, where the video information
Modulation is performed according to. The light valve in this example
For example, using a polysilicon TFT as a switching element
Can be used. The light guide system 927 includes an incident side reflection mirror 971.
, An output-side reflection mirror 972, and
Arranged in front of the intermediate lens 973 and the liquid crystal panel 925B.
It is composed of a condenser lens 973 placed. Light of each color luminous flux
The path length, that is, from the light source lamp 805 to each liquid crystal panel
Is the longest for the green luminous flux B,
The light amount loss of the luminous flux becomes the largest. However, the light guide system 92
By interposing 7, the light amount loss can be suppressed. Yo
Therefore, it is possible to make the optical path lengths of the light beams of the respective colors substantially equivalent.
Wear. Next, the liquid crystal panels 925R, G, and B are
The respective color light fluxes modulated by the light enter the color combining optical system 910.
And recombined here. In this example, as described above,
A prism unit 910 composed of an cyclic prism
A color synthesizing optical system is configured by using these. Recombined here
The specified color image is transmitted through the projection lens unit 6 to a predetermined
Is magnified and projected on the screen at the position. Here, in the optical system of this embodiment,
In addition to the configuration, a half-wave plate is arranged in the path of the luminous flux of each color.
It is preferable that the light beams of the respective colors are aligned with S-polarized light.
When only the S-polarized light can be used, the P-polarized light can be used.
Randomly polarized light with mixed light and S-polarized light
Compared to when using, the color component with a dichroic mirror
The releasability is improved. The light guide system 927 uses a mirror.
S-polarized light is reflected compared to P-polarized light
The efficiency is good, so it is possible to suppress light loss etc.
There are also advantages. (Prism unit 910)
The unit 910 has four triangular prisms with the same refractive index.
By attaching the rhythm, a prism with a square cross section
A dielectric film is formed on each bonding surface
Thus, desired optical characteristics are provided. These four prisms are accurately bonded together.
Otherwise, it is not possible to combine through the obtained prism unit 910.
The images of each color are no longer aligned on the screen,
Quality degrades. For example, as shown in FIG.
Such an adverse effect occurs when the bonding surface has a step.
You. As a method to bond each prism accurately
Are four prisms 910a and 910a, as shown in FIG.
10b, 910c and 910d, a pair of prisms
910a and 910b are attached together with a step
And the other pair of prisms 910c and 910d
Similarly, attach a step and attach
Use step surfaces 910e and 910f of
Then, the prisms of each pair are stuck together. However, in this method, alignment in one direction is performed.
Can be set, but alignment in the direction perpendicular to this
Absent. Therefore, the prism unit 910 of the present example has the following
So that the four prisms are glued together exactly
I have to. As shown in FIG. 22, the prism 910c is
Longest, prisms 910b, 910d shortest
Then, the remaining prism 910a is set to an intermediate length.
The longest prism 910c and the shortest prism 910
and d are stuck together in a state where there is a step up and down. As well
The middle prism 910a and the shortest prism
910b are stuck together in a state where there is a step up and down. This
Followed by the longest prism 910c and an intermediate length
Mechanism 910a with a step on the upper end side.
Then, each pair of prisms is attached. The prism obtained by bonding as described above
In the unit 910, a conventional alignment surface is used.
Alignment surfaces 910e and 910f similar to
There are also alignment surfaces 910g and 910i parallel to this
It is formed. In addition, it is orthogonal to these alignment surfaces.
An alignment surface 910j is formed on the upper end side. But
Therefore, apply jigs to these surfaces and apply four prisms
Can be bonded accurately. Further, the pre-bonded preform of this example
The prism unit 910 is formed at the upper end of the prism 910c.
Orthogonal alignment surfaces 910f and 910
By using j, the predetermined of the optical lens unit 9 is
By attaching to the mounting position of the
I make a decision. That is, in this embodiment, the prism fixing plate 91
1 is made of a resin having the shape shown in FIG.
You. On the surface of the fixing plate 911, the prism 91
0c is a right-angled two-dimensional depth that just fits the upper surface 910j.
An equilateral triangular attachment groove 911a is formed. this
Top surface of prism 910c with respect to bottom surface 911b of the groove
910k is adhesively fixed. A pair of orthogonal sides 9 of the groove
11c, 911d, the position of the prism 910c, respectively
By pressing the mating surfaces 910j and 910f,
The center of the prism unit 910 is accurately positioned
Therefore, the prism unit 910 must be mounted at the correct position.
It is. In this example, a plurality of prism fixing plates 911 are provided.
Is fixed to the bottom wall 92 of the head plate 903 by the fixing screw of
The prism unit 910 was attached to the upper surface.
It has a structure. (Mechanism for Preventing Light Stroke, etc.)
In the prism unit 910 of FIG.
Red light is incident on the prism surface where the modulated light beam that has passed through 25R is incident.
A glass filter that passes light but absorbs and blocks blue light.
It is preferable that the filter 912 be pasted. Sand
24. As shown in FIG.
A glass filter 912 is provided on the entrance surface 910R of the color modulated light beam.
Is pasted. Each light valve 925R, G, B
The modulated light flux of each color that has passed through the prism unit 910
, And is reflected by the X-shaped reflecting surface to form a projection lens.
The light is emitted to the side of the noise unit 6. However, the slightest
Amount of light passes through without being reflected by the reflective surface,
Liquid crystal light bulbs facing each other with the
To the side of the bus. For example, a blue modulated light beam passes through a blue reflective surface.
To enter here from the back of the red light valve 925R.
May shoot. Conversely, the red modulated light beam
After passing through the launch surface, from the back of the blue light valve 925B
It may enter here. In addition, the green
The dimming flux does not pass through the prism unit 910 and is
Reflected on the side of the color light valve 925R
There is. In this way, light is applied to the liquid crystal light valve from the back side.
If incident, adverse effects such as malfunction of the liquid crystal panel will occur.
There is a risk of coming out. In particular, blue light, which is light on the short wavelength side
This effect is particularly large. So, above
As described above, the red modulated light flux in the prism unit 910 is
A glass filter 912 is attached to the entrance surface 910R.
Then, the blue luminous flux is applied to the liquid crystal light valve 925R from the back side.
Preventing such incidents will avoid such adverse effects.
be able to. Note that, in addition to the above-described filter 912,
A red light-absorbing beam is also provided on the color modulation light beam incident surface side.
A filter may be attached. (Power Supply Unit) The power supply unit 7 is shown in FIG.
As shown in the figure, inside the metal shield case 701
Each component is built-in, and the electrical and magnetic
It prevents the noise from leaking to the outside. sticker
The door case 701 is provided on the left and right side walls of the outer case 2 of the apparatus.
The left end is facing the front of the device.
It has a planar shape protruding with a constant width. That is,
Of the optical system block 9 in front of
The reflection mirror 931 of the illumination system is 45
It is arranged at an angle of degrees. Anyway this backside space
It is easy to become dead space. In this example, this space 703
In order to make effective use of the
Protruding part 702 is formed by protruding to the side of
An arrangement space for the components of the source unit is secured. The shield case 701 of the power supply unit 7
Has a rectangular hollow cross section, and its rigidity is
Generally higher than in comparison. The bottom side of this case 701 is
With several fixing screws, the bottom 4a of the lower case 4
Fixed. In addition, the upper surface side
Fixed to the upper wall 3a of the upper case 3 by the fixing screw
Have been. As described above, in this example, the rear end
The upper case 3 and the lower case 4
Fixed to the shield case 701 with high
The outer case at the rear end has high integrity and high rigidity
It's getting worse. Here, the power supply unit 7 is arranged in the apparatus.
Is heavier than other components This power supply
The heavy parts in the device together with the unit 7
Prism unit 91 fixed before and after head plate 903
0 and the projection lens unit 6. In this example, FIG.
As can be clearly understood from FIG.
And are arranged in a horizontally long state. The power supply unit 7
By appropriately setting the arrangement of each component of
Adjust the center of gravity so that it is located in the center of the device in the width direction.
is there. On the other hand, at the front end of the device,
Prism unit 910 and projection lens unit 6
Is placed. Therefore, in this example, the weight of the device is
The center position is almost at the center of the device in the width and front-back directions.
Will be placed. As a result, the portable handle 38 is pulled.
And the left side of the device faces up as shown in FIG.
Accidentally dropping the device while carrying the
Also, the device is located at the center of the front, back, left and right
Therefore, it will fall in that posture. The center of gravity of the device
If the position is offset to the front or back or left or right,
Falls while falling to the side of the center of gravity. Fall like this
First, the corner of the outer case of the device collides with the floor etc.
So that an excessive impact force acts on the local area,
Extremely high risk of breakage. However, in this example
The device falls as it is without falling
Therefore, the right side of the lower device is almost
Is extremely unlikely to cause local damage due to collision with
There is an advantage that. Further, the power supply unit 7 is
The bottom or top side is fixed to the outer case 2 side.
It is only specified. However, in this example, FIG.
As can be seen from FIG.
At the height corresponding to the position of the center of gravity
04 is fixed to the outer case 2 side. This example
Then, the lower case 4 is fixed to the rear wall 4d. this
As a result, if vibration is applied to the
Shaking before and after the knit 7 is effectively prevented. On the other hand, in the power supply unit 7 of this embodiment,
The power supply path to each drive section as short as possible.
And the lead wire, which is a noise source, as short as possible
Comb, so that noise generation is suppressed
You. First, the AC inlet 36 and the main power switch 3
7 is a rear surface of the shield case 701 of the power supply unit 7
It is fixed directly to. Therefore, each of these
Lead wires from the power supply unit 7
Can be omitted. Further, a lamp replacement lid attached to the back of the apparatus.
Interlock switch 710 linked to opening and closing of 27
Integrated on the front side of shield case 701 of power supply unit 7
Is attached. That is, as shown in FIG.
The interlock switch 710 has a shield case protrusion.
Mounted on the right side of the device at a minute distance 702
I have. The operating portion 711 of the switch 710 is directed downward.
And extends vertically from the upper surface of the replacement lid 27
It is always pushed upward by the operation protrusion 271.
You. In this state, the interlock switch 710 is turned off.
It is in a state. On the other hand, with the replacement lid 27 removed
Then, the operation part of the switch 710 moves downward,
The switch switches to the off state. Thus, in the past,
And the switch located far from the power supply unit 7
710 on the side of the shield case 701 of the power supply unit
It is fixed, and the lead wire to it is shortened. Further, in the power supply unit 7 of this embodiment,
Of the lamp unit 8 disposed adjacent to the front side of the device.
The ballast circuit portion 720, which is the drive circuit, is
The lamp unit is located on the same side as
The lead wire up to the unit 8 is made as short as possible. As described above, in this example, the power supply unit
The power supply path that is drawn from the
Power source is shorter, so there are fewer noise sources
Thus, noise generation can be suppressed. (Arrangement of Substrates) 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,
The control board 13 is, as shown in FIG.
3 at the lower position of the upper wall 3a in parallel with this.
At multiple locations on the outer peripheral edge,
It is fixed to the side of the case 3. This substrate 13 is an optical system
Form that covers the upper surfaces of the block 9 and the light source lamp unit 8
Shape. In addition, immediately above the prism unit 910
The minute portion has a shape cut into a rectangle. This substrate 1
3 is arranged at the left end of the upper surface of the device.
The contacts corresponding to the operated switch group 26a are arranged.
Have been. As can be seen from FIG.
The substrate 11 is slightly higher than the bottom wall 4a of the lower case 4.
It is arranged in parallel at the position. Also video board
Reference numeral 12 denotes a device from the front side of the interface board 11.
Place it upright and parallel to the left side wall of the device.
Is placed. These two substrates 11 and 12 are
-To the board fixing bracket 111 fixed to the bottom wall 4a of the case 4
Therefore, it is supported. Also, on the board fixing bracket 111
At the end, a shield plate 112 is attached.
The upper end of the screen plate 112 extends to the upper end of the video board 12.
Is running. Therefore, these two substrates 11, 1
2. The shield plate 112 and the
Thus, a shield space is defined between them.
Therefore, the electric elements and
Prevents the noise generated from the child element from leaking to the outside.
It is. Here, the electrical connection between the substrates is as follows.
It has become. First, on the surface of the interface board 11,
Is provided with a connector 113 with the video board 12 side.
ing. This connector is provided on the lower surface of the video board 12.
Connector 114 that can be plugged into connector 113
Have been. Similarly, the upper surface of the video board 12
Is provided with a connector 115 for the control board 13 side.
You. The connector 115 has a connector
A connector 116 that can be plugged in is provided. And
Accordingly, as shown in FIG.
In the state where 3 is arranged, the corresponding connectors
Comrades are connected. As described above, in this example, the connection between the substrates is
It is formed without leading a lead wire or the like. But
Therefore, there are few noise sources and the generation of noise is suppressed.
be able to. Further, in this example, as can be seen from FIG.
Then, fix the corners of the outer peripheral edge of the control board 13 using fixing screws.
And fixed to the outer case 2 side, that is, the ground side.
You. Such corners are areas where noise is likely to occur.
Minutes. However, such a part is grounded as in this example.
By doing so, it is possible to suppress the occurrence of noise
Has become. (Structure of the Head Plate Part) FIGS.
The shape of the head plate 903 will be described with reference to FIG. H
The plate 903 extends vertically in the width direction of the device.
A vertical wall 91 extending horizontally from a lower end of the vertical wall 91.
It is basically composed of a bottom wall 92. Vertical wall 91
As shown in FIG. 8, reinforcing ribs 91a are provided on the surface in the vertical and horizontal directions.
It is a wall with a large number of formed and high out-of-plane rigidity.
The light emitted from the prism unit 910 passes through
Rectangular opening 91b is formed. Also,
The vertical wall 91 has a screw hole for fixing the prism unit.
91c and the projection lens unit 6
A screw hole 91d for fixing the base end side of
You. As can be seen from FIG. 4, the front surface of the vertical wall 91
The base end of the projection lens unit 6 is fixed to
The prism unit 910 is fixed to the front surface. As described above, the vertical wall 91 having high rigidity is sandwiched.
The prism unit 910 and the
And the projection lens unit 6 are fixed.
High integration, mutual displacement even when impact force is applied
There is an advantage that the possibility of occurrence of pitting is extremely small. On the back surface of the bottom wall 92 of the head plate 903,
A cooling fan 15 is attached. On this bottom wall 92,
A communication hole (not shown) for passing cooling air is formed.
Has been established. Here, FIG. 2 (b) and FIG.
As can be seen, the upper end of the vertical wall 91 of the head plate 903 and
The upper case 3 and the lower case
Mounting portions 91e and 91f for the case 4 are formed.
You. These parts are fixed to the upper
-It is fixed to the case 3 and the lower case 4 side. As described above, in this example,
Thus, the upper case 3 and the lower case 4
The rear end portion is fixed to the power supply unit 7 and the front end portion
The portion is fixed to the head plate 903. Thus, before
Since it is fixed to a rigid part later,
High integrity and rigidity of par case 3 and lower case 4
It becomes. Therefore, impact resistance is improved, and
Loss is less likely to occur. (Cooling Mechanism) Next, FIG. 7, FIG.
Referring to FIG. 10 and FIG.
The cooling mechanism of each heat generating part will be described. Basic cooling air in the device 1 of this embodiment
Is a path as shown in FIG. 8 in plan view.
Through the vent holes 28 formed in the bottom wall 4a of the device 1
Air sucked by the cooling suction fan 15
Passing through the inside of the optical lens unit 9 and on the right side of the device
The exhaust fan 16 is arranged to exhaust air to the outside again.
Will be issued. The main airflow distribution route is shown by the bold line in FIG.
As shown in FIG.
When viewed from the surface, it passes through the optical lens unit 9 and
It reaches the exhaust fan 16, passes through it and is exhausted to the outside.
You. Another air flow 1120 is provided for the optical lens unit.
9 from the front side of the light source lamp unit 8
Vent hole 804a formed in the housing 804,
And ventilation formed in the inner housing 803
It penetrates through the hole 808. Pass here
After passing through the exhaust port 807 on the back side,
The air is exhausted to the outside via the exhaust fan 16. On the other hand, another air flow 1130
Through the optical lens unit 9 to the end of the power supply unit 7
It is sucked by the auxiliary suction fan 17 attached thereto,
Is drawn into the power supply unit 7 and passes through
From the other end to the outside
Is discharged. FIG. 9 shows that the power supply unit 7
The three-dimensional flow of the air flow 1130 is shown.
You. As shown in this figure, the air flow 1130 is
After being sucked from the outside by the
Insertion of each light valve 925R, G, B in knit 9
It is blown up along the launch side and exit side surfaces,
Through the air hole opened in the upper light guide 901,
Between the surface and the back surface of the upper wall 3a of the upper case,
Lateral flow along between them. Next, the upper light
Uniform illumination optical element through ventilation hole
Are integrated lens lenses 921 and 922
Lower the optical lens unit 9 that is
Wrap around the lower side from the vent hole opened in the guide 902
After a while, the power supply unit via the suction fan 17
7 is introduced. After this, the exhaust fan 16 side
And is discharged to the outside through here. As described above, in this embodiment, the auxiliary exhaust fan
17 is forcibly cooled inside the power supply unit 7
Air flow is introduced. Therefore, the heat source
The inside of the source unit can be effectively cooled. FIG. 7 shows the light passing through the light source lamp unit 8.
The three-dimensional flow of the flowing airflow 1120 is shown.
As shown in this figure, the air flow 1120 is
Flow between the door 901 and the back surface of the upper case upper wall 3a.
To reach the upper part of the front end on the emission side of the light source lamp unit 8.
You. From here, the surface of each component of the light source lamp unit 8
To the rear exhaust fan 16. sand
That is, the airflow 1120 is generated by the outer housing 804.
Flows along inner and outer surfaces and inner housing
It flows along the inner and outer surfaces of 803. Furthermore, reflation
Flows along the surface of the As described above, in this example, the light source is arranged along the optical axis.
The air flow 1 from the front end of the lamp unit 8 to the rear
120 are formed, a lamp 805, a reflector 806
Is efficiently cooled around the heat source. Next, in this example, it can be seen from FIGS.
Similarly, the vent hole 24 is also provided on the upper case 3a side.
Is formed. Therefore, for example, the intake fan 1
The filter 29 attached to the ventilation hole 28 of No. 5 is clogged.
Occurred and could not introduce enough outside air through here
In this case, the outside air flows from the upper ventilation hole 24 as follows.
be introduced. As shown in FIG. 10, the lower ventilation hole 28
If it is clogged, the inside will be in a negative pressure state.
4 introduces outside air and air as indicated by a thick line 1140
Flow occurs. This air flow 1140 is conducted from the vent hole 24.
And is sucked by the intake fan 15 on the lower side.
Is blown up again. Some are circulating and suck
Circulation through the air fan 15 (of course, such circulation
The flow is normal without clogging of the lower vent 28.
Even if it has occurred. ). Other air flows are described above.
Each air flow 1110, 1120, 1130
Flow through each part to the outside from the exhaust fan 16
Is discharged. Here, when the lower air hole 28 is clogged,
Effective introduction of outside air from the upper ventilation hole 24
Around the intake fan 15, the sealing plate 1
150 is attached. This sealing plate 1150
A vent corresponding to the hole 24 is open,
Around the lower light guide 902 and the bottom wall 92 of the head plate
Adhered to the back. Therefore, the circulation as shown in FIG.
The reflux is formed efficiently. That is, the upper communication hole 2
4, the introduction of outside air is effectively performed. As described above, in this embodiment, the communication hole 24 is provided.
Communication hole for introducing outside air on the side of the intake fan 15
Even if 28 is clogged, cooling of the inside of
I can. Also, a sealing plate 1150 is attached.
Therefore, in such a clogged state, the intake fan
Efficiently introduces outside air from the vent hole 24 away from
It can be carried out. (Light Valve Positioning Mechanism)
4. Referring to FIG. 5, the liquid crystal light valve 925 of the present embodiment
The R, G, and B positioning mechanisms will be described. These three
Since the positioning mechanism of the two light valves is the same,
Of the positioning mechanism for the two light valves 925R
I do. The light to which the light valve 925R is attached
The valve block 1200 is attached to the bottom wall 9 of the head plate 903.
2 is fixed to the upper surface. This light valve block
1200 is a lower adjustment plate 12 attached to the bottom wall 92.
It has ten. The lower adjustment plate 1210 has
A pair of long holes 1211 and 1212 are formed.
Has a shape that is long in the optical path direction, and through these,
The bottom wall 9 of the head plate is fixed by fixing screws 1213 and 1214.
It is fixed at 2. On the upper surface of the lower adjustment plate 1210,
When the focus adjustment plate 1220 is attached
Have been. The focus adjustment plate 1220 is attached to the vertical wall 1
221 and a bottom wall extending horizontally from the lower end to the upstream side of the optical path
1222 and the optical path downstream from the upper end of the vertical wall 1221 horizontally.
An upper wall 1223 extending to the side is provided. Of the bottom wall 1222
A dowel 1224 is formed at the center, and this is the lower adjustment plate 12.
10 rotatably supported. Therefore,
The focus adjustment plate 1220 defines a vertical line passing through the dowel 1224.
It can turn left and right as the center. The bottom wall 1222
On the side of the lower adjustment plate 1210 by the pair of fixing screws 1225
Fixed. On the other hand, the upper wall 1 of the focus plate 1220
223 is a prism unit by a fixing screw 1226.
Is fixed to a cover 910a that covers the upper surface of the
You. The screw hole 1227 of the screw 1226 is
Larger dimensions and therefore the screw
By loosening 1226, the position of the focus adjustment plate 1220
Can be moved slightly back and forth and left and right.
You. A notch 12 is provided at the tip of the upper wall 1223.
28 are formed. Prism unit cover 910
On the side of a, at a predetermined interval with respect to this notch 1228,
Notches 910b are also formed at opposing positions. H
When the focus plate 1220 is attached,
Insert a blade such as a flathead screwdriver between these notches.
An insertable groove 1229 is formed. Fixed
The insertion groove 1 is slightly loosened
Insert the blade edge of a screwdriver etc. into 229 and rotate,
The focus adjustment plate 1220 includes a prism unit 910
Around the dowel 1224
At the same time, it also moves in the optical path direction (front-back direction). As described above, it is possible to move back and forth along the optical path direction.
The vertical wall 1221 of the focus plate 1220
The vertical adjustment plate 1230 is supported in a state parallel to the vertical direction.
That is, a vertical adjustment plate support is provided above and below the vertical wall 1221.
Are formed, and the vertical adjustment plate 1230 is sandwiched between them.
ing. The lower end of this vertical adjustment plate 1230 is
The lower end of the focus plate 1220 via the spring 1231
And the top end is attached to the focus plate 1220
A pair of left and right alignment adjustment screws 1232 and 123
3 pushed downwards. Therefore, this pair
Adjust the screwing amount of the adjusting screws 1232 and 1233
This allows the vertical adjustment plate 1230 to move the focus plate 122
It can be moved up and down relatively to zero. This vertical adjustment plate 1230 has
In this state, the horizontal adjustment plate 1240 is supported. This water
The flat adjustment plate 1240 has an alignment adjustment on one of the left and right sides.
The other side is pressed by one aligning spring 1241
G is pressed by the adjusting screw 1242. Accordingly
By adjusting the screwing amount of the screw 1242,
The horizontal adjustment plate 1240 with respect to the vertical adjustment plate 1230
It can be relatively moved in the lateral direction. This horizontal adjustment plate
A liquid crystal light valve 925R is installed at the center of 1240.
The attached light valve unit 1250 is fixed
I have. Light valve block 1200 of this configuration
After fixing it to the head plate bottom wall 92,
While adjusting the plate 1210 back and forth along the optical path direction,
Focus plate 1220 is perpendicular to dowel 1224
Around the light bubble 925R.
Easy positioning of focus position, that is, optical path direction
It can be carried out. Also, the vertical adjustment plate 1230, the horizontal adjustment
By moving the slab 1240 up and down, left and right,
It is possible to adjust the alignment of the air bubble 925R.
Wear. Here, the write bubble block 12 of this example
In 00, three plates, ie, focus adjustment
Plate 1220, vertical adjustment plate 1230 and horizontal adjustment plate 12
40 is a total of three parts: the right and left substantially central parts and the upper central part.
At the position, the U-shaped adjustment plate fixing spring 1260
Fixed. As before, these three plates are
Unlike when fixing with the fixing screw,
Operation such as loosening the fixing screw when performing residue adjustment
No adjustment is required, with the fixed spring 1260 attached.
There is an advantage that can be. Also perform positioning
After that, tighten the fixing screws as before and remove the three plates
When fixed, three pieces are adjusted by the tightening operation.
May be displaced, but in this example,
No operation is required, so the three plates may be misaligned after adjustment.
Not. However, after positioning, the three plates are completely
In order to integrate, in this example, at the upper end of the three plates,
An adhesive reservoir 1270 is formed. This adhesive reservoir 127
After the three plates have been aligned, the adhesive
And fix them by adhesive. (Structure of Height Adjusting Foot) FIGS. 14 and 15
Shows the height adjustment feet 31R and 31L, respectively.
I have. Both feet have the same shape and
Height adjustment mechanism is the same, so that one foot 31L
Will be described. The foot 31L is connected to the front of the device.
Disc-shaped foot body exposed from the lower end of the case 5
311 and a shaft 31 extending coaxially from the upper end
Two. Shaft 312 is attached to lower case 4
With the foot adjuster plate 313 fixed and supported
It is supported so that it can move up and down.
A male screw 317 is formed over substantially the entire length. The front case 5 is exposed from the lower end to the front.
The back side of the foot stopper button 32L
A foot stopper 314 is formed integrally. this
The shaft 312 passes through the foot stopper 314.
A penetrating portion 315 is formed. In addition,
The foot stopper spring 316 always controls the foot stop.
The pad 314 is pushed toward the front of the apparatus. Accordingly
The button 32L on the front side of the foot stopper 314
Always held forward from front case 5
Have been. In this state, the foot stopper 314
A part of the inner peripheral surface of the through portion 315 is outside the shaft 312.
The peripheral surface is contacted with a predetermined pressure. Inner peripheral surface of this penetration
Has 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 configuration is
Up and down movement is prohibited by the spring 316. Scold
When the button 32L is pushed in against the spring force,
The stopper 314 comes off the shaft 312. this
As a result, the foot 31L moves along the foot adjuster plate 313.
To move freely up and down. Therefore, the device 1
If you lift with both hands and press the left and right buttons 32L, R,
Since the feet 31L and 31R fall by their own weight,
Can be pulled out by a predetermined length. After this,
Button with foot pulled out to target length
When 32L and R are separated, the foot is fixed at that position. After that, when the foot itself is turned,
Of the screw 318 on the side of the stopper 314
Move slightly up and down along. Therefore, button 32
The length of the feet 31L, R roughly adjusted by pressing L, R
Fine tune by turning the foot itself
be able to. Thus, in this example, before the device 1
Adjusting the height of the end by simple operation and in a short time
And set the device 1 to the desired tilt angle.
Can be. (Handle mounting structure) Referring to FIG.
Next, the mounting structure of the handle 38 will be described. Handle 3
8 is a handle recess 3 formed on the side surface of the device 1.
e. The handle 38 has a pair of lower ends.
Swivel around the minute 38a, 38b and pull out sideways
State. In this example, the rotation shaft 381 of the handle is
The bearing part is formed by the side wall 3b of the upper case and the lower
As formed by combining the ground side walls 4b.
It has become. Also, the lower end portions 38a, 38 of the handle
A slightly protruding protruding surface 383 is formed on the peripheral surface of b.
ing. With this protruding surface 383, the handle 38 is
17 (a), a storage position indicated by a solid line, and a drawer indicated by an imaginary line
To a fixed position with a predetermined restraining force.
You. [0086] As described above,Projection table of the present invention
According to the indicating device,Light source lamps and reflexes that make up the light source
Parts can be efficiently cooled. [0087] [0088]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an external shape of a projection display device according to one embodiment of the present invention. FIGS. 2A and 2B are diagrams showing the arrangement of each component inside the apparatus of FIG. 1, wherein FIG. 2A is a diagram showing its planar arrangement, and FIG. 2B is a diagram showing its three-dimensional arrangement. FIGS. 3A and 3B are diagrams illustrating a part of an optical lens unit and a projection lens unit, which are taken out and shown, wherein FIG. 3A is a schematic plan view and FIG. 4A and 4B are diagrams illustrating a head plate, a prism unit, and a projection lens unit, which are taken out and shown. FIG. 4A is a schematic plan view, and FIG. 4B is a schematic cross-sectional view. 5A and 5B are views showing a light valve block, and FIG.
Is a plan view, (b) is a front view, and (c) is a 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 an arrangement of substrates. FIG. 12 is an explanatory diagram showing an arrangement of substrates. FIG. 13 is an explanatory diagram showing an arrangement of substrates. FIG. 14 is a partial sectional view showing a structure of a height adjusting foot. FIG. 15 is a partial sectional view showing a 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 a structure of a handle attachment portion. FIG. 18 is an explanatory diagram showing the position of the center of gravity of the apparatus 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 illustrating an example of a displacement of a prism unit. FIG. 21 is an explanatory diagram for describing a conventional prism unit bonding method. FIG. 22 is an explanatory diagram for explaining a method of bonding the prism units of the present example. FIG. 23 is an explanatory diagram showing a shape of a prism unit fixing plate. FIG. 24 is an explanatory view showing a preferred example of a prism unit. [Description of Signs] 1 Projection display device 1a Optical axis 2 Outer 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 Vent hole 807 Vent 9 Optical lens unit 903 Head plate 910 Prism unit (color synthesizing means) 924 Color separation means 925R, 925G, 925B Light valve 15 Intake fan 16 Exhaust fan 17 Auxiliary intake fan 24 Vent (air exhaust) 28 Vent (Cooling air intake) 43 Exhaust port 1100, 1120, 1130, 1140 Air flow 1150 Sealing plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akinaga Kode 3-3-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (72) Inventor Toshiaki Hashizume 3-5-3 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (56) References JP-A-6-281907 (JP, A) JP-A-6-148590 (JP, A) JP-A-6-28836 (JP, U) JP-A 63-54136 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/74 G03B 21/00

Claims (1)

(57) [Claim 1] An optical system that optically processes a light beam emitted from a light source to form an optical image corresponding to image information, and enlarges the optical image formed here. In a projection display device having a projection lens for projecting and an outer case for housing the optical system, a cooling air intake formed in the outer case, and an intake fan for introducing outside air into the outer case therefrom. And an air outlet formed in the outer case for discharging air introduced into the outer case to the outside, and discharging air inside the outer case to the outside of the outer case through the air outlet. and an exhaust fan for the light source is configured to include a lamp and reflector has a lamp case for holding the light source, vent the front upper portion of the lamp case is formed, before An exhaust port is formed on the rear surface side of the case, the suction side of the exhaust fan is located behind the exhaust port, the front side is the light emission side of the lamp, and the rear side is the rear side. At least a part of the airflow introduced into the exterior case by the intake fan is opposite to the light emission side of the lamp, and is provided in front of the lamp case .
Directly above the lamp from the vent formed in the upper part
Flows toward the side, and from inside the reflector,
A projection display device, wherein the projection display device flows along the outside of a reflector, is sucked from the exhaust port toward the exhaust fan, and is exhausted outside the exterior case.