JP3598760B2 - Projection display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides an optical unit that optically processes a light beam emitted from a light source lamp unit to form an optical image corresponding to image information, and enlarges and projects the optical image on a projection surface by a projection lens unit. The present invention relates to a projection display device including a power supply unit that supplies power to an optical unit.
[0002]
[Background Art]
Conventionally, an optical unit that optically processes a light beam emitted from a light source lamp unit to form an optical image corresponding to image information, and enlarges and projects the optical image on a projection surface by a projection lens unit; 2. Description of the Related Art There is known a projection display apparatus including a power supply unit that supplies power to a unit, an outer case that integrally houses the optical unit and the power supply unit, and a plurality of circuit boards for controlling the optical unit.
[0003]
The optical unit of the projection display device includes, in addition to the light source lamp unit and the projection lens unit described above, a color separation optical system that separates a light beam into light beams of three primary colors, and a modulated light beam that modulates each of the separated light beams based on image information. And a color combining optical system that combines the modulated light beams and emits the combined light beam to the projection lens unit.
[0004]
The color separation optical system and the modulation system of the optical unit are housed and arranged together with the light source lamp unit in a light guide having a predetermined optical path. This light guide is divided into upper and lower parts, and is configured to sandwich an optical element such as a color separation optical system from above and below.
[0005]
The color combining optical system and the projection lens unit of the optical unit are mounted on a head plate having a vertical wall and a bottom wall extending horizontally from the lower end of the vertical wall. Specifically, the base end side of the projection lens unit is fixed to the vertical wall, and the color combining optical system is arranged on the bottom wall. The projection lens unit and the color combining optical system emit light through the vertical wall. They are integrated with their axes aligned.
[0006]
Such a head plate is fixed to the light guide by screwing the lower end of the vertical wall to the lower light guide, and the modulated light flux enters the color combining optical system on the head plate from the modulation system in the light guide. It has become.
[0007]
[Problems to be solved by the invention]
However, in such a projection display device, since the head plate is connected to the light guide at the lower end of the vertical wall, the distance between the connection portion and the center of gravity of the projection lens unit is long, and the head plate of the projection lens unit is The vertical wall may be bent by the load, and the optical axes of the color combining optical system and the projection lens unit may be shifted. In addition, a moment generated in a portion where the projection lens unit is fixed due to disturbance or impact causes a bending stress at a bottom portion of the head plate and a root portion of the vertical wall. For this reason, the vertical wall must be reinforced by providing a large number of ribs, and there has been a problem that the structure of the head plate is complicated.
[0008]
An object of the present invention is to provide a projection display device that can simplify the structure of a head plate.
[0009]
[Means for Solving the Problems]
The present invention provides an optical unit that optically processes a light beam emitted from a light source lamp unit to form an optical image corresponding to image information, and enlarges and projects the optical image on a projection surface by a projection lens unit. A projection display apparatus comprising: a power supply unit that supplies power to an optical unit; and an outer case that houses the light source lamp unit, the optical unit, and the power supply unit, wherein the optical unit converts the light flux into a plurality of colors. A color separation optical system that separates the separated light beams, a modulation system that modulates each of the separated light beams based on the image information and emits the modulated light beams, and the projection lens unit that combines the respective modulated light beams. A projection lens unit and the color synthesis optical system are mounted on a head plate, and inside the outer case. A support portion for supporting the head plate is provided, and the head plate is provided with a vertical wall to which a base end side of the projection lens unit is fixed, and extends horizontally from a lower end portion of the vertical wall to form the color combining optical system. A bottom wall for supporting, and a supported part supported by the support part provided in the outer case. The supported portion is provided on the vertical wall, and is provided within a height range of the vertical wall from the height position at the upper end to the height position at the lower end of the outer shape of the projection lens unit. It is characterized by the following.
[0011]
Here, within the height range from the height position of the upper end to the height position of the lower end of the outer shape of the projection lens unit includes the same height position as the height positions of the upper end and the lower end of the projection lens unit.
[0012]
In the present invention, the supported portion is provided at a height position within the height range of the outer shape of the projection lens unit on the vertical wall, so that the bending moment generated according to the center of gravity of the projection lens unit causes the vertical movement of the head plate. Since the bending stress generated at the base (lower end) of the wall can be efficiently dispersed and absorbed by the support portion of the outer case, the bending stress can be reduced, and the vertical wall can be prevented from being flexed reliably. . Therefore, it is not necessary to provide a complicated reinforcing structure on the vertical wall, so that the structure of the head plate can be simplified, and the projection lens unit and the color synthesizing optical system can be accurately positioned through the vertical wall. Displacement can be reliably prevented.
[0013]
When the outer shape of the projection lens unit is substantially equal to or larger than that of the vertical wall, the supported portion is, when the height of the entire vertical wall is set to 1, at least one-fourth from the lower end of the vertical wall. Is preferably provided at a height position, more preferably within a height range of not less than one third and not more than two thirds.
[0014]
Further, it is preferable that the supported portion is provided at a position on the vertical wall substantially at the same height as an optical axis of the projection lens unit.
[0015]
When the supported portion is provided at such a position, the height of the center of gravity of the projection lens unit and the height of the supported portion can be substantially equal, or the supported portion can be higher than the center of gravity. Since the dispersion can be performed efficiently, the structure of the vertical wall can be further simplified.
[0016]
In the above, the supported portion includes a fixing surface that protrudes from the vertical wall in parallel with the bottom wall and is supported and fixed to the support portion, and a reinforcing rib perpendicular to the fixing surface stands on the vertical wall. It is desirable that it is installed.
[0017]
If the supported portion is constituted by the fixing surface protruding from the vertical wall as described above, the supported portion can be used also as a reinforcing rib for reinforcing the vertical wall. Further, by providing the reinforcing ribs orthogonal to the fixing surface, the rigidity of the vertical wall can be further increased with a simple structure.
[0018]
Further, the head plate is preferably made of a magnesium molded product. According to this, the specific gravity can be reduced, so that the weight of the device can be reduced and excellent moldability can be ensured. Further, magnesium can improve the reliability of impact resistance while reducing the weight by making the most of the advantage that thin-wall molding can be performed.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a projection display device according to an embodiment of the present invention will be described with reference to the drawings.
[0020]
1. Overall configuration of the device
1A and 1B show a front view and a rear view of a projection display device 1 according to a first embodiment, and FIGS. 2A and 2B show a projection display device 1. A top view and a bottom view are shown.
[0021]
The projection display device 1 has a substantially rectangular parallelepiped shape, and has an outer case 2 in which an optical unit 10 described later is accommodated, and as shown in FIG. The projection lens unit 6 is provided.
[0022]
The outer case 2 is divided into upper and lower portions substantially at the center of the projection lens unit 6, and includes an upper case 3 that covers an upper surface portion of the projection display device 1, a lower case 4 that covers a lower surface portion, and FIG. And a rear case 5 that covers the rear surface of the projection display device 1 shown in FIG.
[0023]
2. Exterior case structure
The upper case 3 includes a rectangular upper wall 3a, left and right side walls 3b and 3c extending substantially vertically downward from three sides excluding the rear side, and a front wall 3d.
[0024]
As shown in FIG. 2A, a large number of communication holes 25R, 25L are formed at the left and right ends on the front side of the upper wall 3a of the upper case 3, and the inside of the device corresponding to these communication holes 25R, 25L. Is provided with a built-in speaker (not shown). An operation switch 26 for adjusting image quality, focus, and the like of the projection display device 1 is provided at a substantially central portion of the upper wall 3a.
[0025]
As can be seen from FIG. 1A, a light receiving plate 351 for receiving a remote control having the same function as the operation switch 26 is provided on the front surface of the apparatus, and the projection display apparatus 1 can be remotely operated. It is possible.
[0026]
The lower case 4 is formed of a rectangular bottom wall 4a, left and right side walls 4b, 4c and a front wall 4d which stand substantially vertically from three sides excluding the rear side.
[0027]
As shown in FIG. 2B, the bottom wall 4a has a lamp replacement lid 27 for replacing a light source lamp unit 8 (described later) housed therein, and an air intake 240 for cooling the inside of the apparatus. The air filter cover 23 provided with is formed.
[0028]
The lamp replacement lid 27 is formed with a large number of air intake holes 271, and cooling air is supplied to the inside of the apparatus not only from the air intake 240 but also from the air intake holes 271.
[0029]
As shown in FIGS. 1 and 2B, the bottom wall 4a is provided with rear end feet 31R and 31L at the left and right corners at the rear end, respectively, at positions corresponding to the front end projection lens unit 6. Is provided with a front end foot 31C for height adjustment, which protrudes to the lower surface side of the bottom wall 4a.
[0030]
The rear end foot 31R is provided with an adjustment mechanism capable of adjusting the amount of protrusion by rotation, whereby the projection screen can be adjusted in the horizontal direction, and the front end foot 31C is provided with an adjustment mechanism shown in FIG. Also, an adjustment mechanism that can adjust the projection screen in the vertical direction by using the foot button 310 shown in FIG. 2A is provided.
[0031]
As shown in FIG. 3, a power cable shield plate 243 is provided inside the lower case 4, and the power cable shield plate 243 includes a wiring insertion portion 244 that covers the AC input line.
[0032]
The power cable shield plate 243 is provided to cut off noise generated from the AC input line, and also serves as a ground bus line of the power supply unit 7 described later.
[0033]
The above-described air intake 240 is covered with a sponge-shaped air filter 241. Therefore, intrusion of dust and the like from the air intake 240 can be prevented. Further, a cushion member 242 made of urethane foam is disposed around the air intake 240 so as to prevent intrusion of dust and the like from the periphery of the air intake 240.
[0034]
As can be seen from FIG. 2, the front wall 3d of the upper case 3 and the front wall 4d of the lower case 4 have a central portion curved slightly convexly forward, and an annular rim 32 is formed around this portion. A circular opening 33 is formed, and a portion on the front end side of the projection lens unit 6 protrudes from the opening 33.
[0035]
The distal end of the projection lens unit 6 is supported by a guard portion 42 extending along the bottom wall 4a. The guard portion 42 is a thick rim that covers the distal end portion of the projection lens unit 6 in a hood shape. By attaching a hand to the guard section 42, the front end side of the apparatus can be lifted without placing a burden on the projection lens unit 6.
[0036]
The rear case 5 is based on a structure that guides and holds the spigot portions of the upper case 3 and the lower case 4 from outside.
[0037]
Although not shown in FIG. 1B, the upper end of the rear case 5 is engaged with three hook portions formed along the inner edge of the upper case 3 and the lower end is formed of a lower end. It is held by being screw-fixed from inside the case 4.
[0038]
As can be seen from FIG. 1B, on the rear wall 5d of the rear case 5, an AC inlet 51 for supplying external power and various input / output terminal groups 50 are arranged on the left side. A portion 501 is formed. The overhang portion 501 is provided with an exhaust port 160 for discharging air inside the apparatus.
[0039]
As described above, since the AC inlet 51 and the input / output terminal group 50 to which the cord such as the signal cable is connected are arranged on the rear wall 5d of the rear case 5, the user usually places the signal cable on the side of the apparatus where the user is located. Etc. are not connected, and the usability is good.
[0040]
3. Internal structure of the device
FIG. 4 shows the internal structure of the projection display device 1. An optical unit 10 for enlarging and projecting image information and a power supply unit 7 arranged on the side of the optical unit 10 for supplying power to the optical unit 10 are integrally housed in the outer case 2 described above. I have.
[0041]
An exhaust fan 16 and an exhaust port 160 for exhausting air inside the apparatus are provided in a portion of the optical unit 10 adjacent to the light source lamp unit 8.
[0042]
3-1. Optical unit structure
The optical unit 10 includes a light source lamp unit 8 in which a light source lamp is housed in a lamp housing, and an optical lens unit that optically processes a light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information. 9, a prism unit 910 for synthesizing an optical image formed by the optical lens unit 9, and a projection lens unit 6 for enlarging and projecting the synthesized optical image on a projection surface.
[0043]
As can be seen from FIG. 4, the light source lamp unit 8 and the optical lens unit 9 are housed in a light guide 100 provided inside the outer case 2 and having a substantially L-shaped optical path in a plane. The prism unit 910 is disposed in cutout portions 9001 and 9002 (see FIG. 6) of the light guide 100, and the projection lens unit 6 is provided so as to protrude from a side surface of the light guide 100.
[0044]
As can be seen from FIG. 4, the optical path from the light source lamp unit 8 to the projection lens unit 6 is substantially L-shaped as a whole. Accordingly, the planar shape of the light guide 100 is correspondingly substantially L-shaped. The light guide 100 occupies the rear half or more of the internal space of the outer case 2. The light source lamp unit 8 is housed in a replaceable state at the position of the light source lamp unit housing part 800 shown in FIG.
[0045]
3-2. Power supply unit structure
On the other hand, the power supply unit 7 is housed in a portion other than the occupied portion of the light guide 100 housed in the projection lens unit 6 and the outer case 2, that is, the power supply unit housing 700, as can be seen from FIG. . Then, a main body portion 71 extending forward along the side wall 2c of the outer case 2 with the vicinity of the light source lamp unit 8 as a base end, and an extending portion bent at the front end of the main body portion 71 and facing the projection lens unit 6 72 and an L-shaped plane.
[0046]
An inlet opening 75 is formed in an end side surface of the extended portion 72 which is one end of the power supply unit 7, and an exhaust opening is formed in the end side surface of the main body portion 71 which is the other end. An opening 77 is formed.
[0047]
Since the air intake 240 formed in the outer case 2 is located below the prism unit 910, the intake opening 75 is located near the air intake 240 and near the projection lens unit 6. It becomes.
[0048]
Although not shown in FIG. 4, the power supply unit 7 contains a primary-side active filter, a power supply, and a ballast.
[0049]
The primary-side active filter includes a transmitting FET, the power supply includes a rectifying diode bridge, a D / D converter oscillation transistor, and a D / D converter three-terminal regulator. The ballast includes a chopper circuit drive FET and a chopper circuit. Each of these elements is mounted on a circuit board.
[0050]
Since each of such elements generates heat, a heat sink is fixed to prevent the temperature of the element itself from rising, and the heat sink is forcibly cooled by the intake fan 17 provided in the intake opening 75. I have.
[0051]
As described above, by utilizing the fact that the optical unit 10 has a flat L-shape and the power supply unit 7 also has a flat L-shape, an area defined by the light guide 100, the projection lens unit 6 and the outer case 2. Is not wasted. That is, since the optical unit 10 and the power supply unit 7 can be efficiently arranged in a narrow area, the size of the projection display device 1 can be reduced.
[0052]
Note that, although not shown in FIG. 4, the input line from the power supply unit 7 to the light source lamp unit 8 is connected to the light source lamp unit 8 via a connector.
[0053]
In addition, such input lines and the like are shielded by a shield plate that covers the light guide 100 so that lamp noise does not occur.
[0054]
4. Optical system
The optical system incorporated in the optical unit 10 will be described with reference to FIG.
[0055]
The optical system according to the present embodiment includes a light source lamp unit 8, an illumination optical system 923 for equalizing the in-plane illuminance distribution of light illuminating the three light valves 925R, 925G, and 925B, and light emitted from the illumination optical system 923. A color separation optical system 924 that separates each light beam into red, green, and blue light beams R, G, and B, and three light valves 925R, 925G, and 925B that constitute a modulation system that modulates each color light beam are modulated. A prism unit 910 as a color combining optical system for re-synthesizing the combined color light beam, and a projection lens unit 6 for enlarging and projecting the combined light beam on a screen.
[0056]
4-1. Illumination optical system
The illumination optical system 923 includes an aggregate of minute lenses, and the integrator lenses 921 and 922 that divide the light emitted from the light source lamp unit 8 into a plurality of partial light beams by the minute lenses, and a set of light having a random polarization direction. A polarization conversion element 920 that converts a partial light beam as a body into light having the same polarization direction, and a superposition lens 930 that superimposes each of the partial light beams converted into light having the same polarization direction on the surfaces of the light valves 925R, 925G, and 925B. It is comprised including.
[0057]
Here, as shown in FIG. 5, the polarization conversion element 920 includes a polarization beam splitter array 9201 and a selective retardation plate 9202, and each of the polarization beam splitter arrays 9201 has a plurality of columnar parallelogram-shaped cross sections. The light-transmitting plate material 9203 has a bonded shape.
[0058]
Polarized light separating films 9204 and reflecting films 9205 are alternately formed on the interface of the light transmitting plate material 9203.
[0059]
Note that this polarizing beam splitter array 9201 is obtained by laminating a plurality of glass sheets having these films formed thereon such that the polarization separating films 9204 and the reflecting films 9205 are alternately arranged, and cuts obliquely at a predetermined angle. It is produced by doing.
[0060]
The partial light beams split by the integrator lenses 921 and 922 are separated into P-polarized light and S-polarized light by the polarization separation film 9204, respectively, and the P-polarized light is selectively formed on the selective retardation plate 9202. The light is converted into S-polarized light by the λ / 2 retardation layer 9206 and emitted.
[0061]
On the other hand, the S-polarized light is bent 90 ° by the polarization separation film 9204, and further emitted as it is by the reflection film 9205.
[0062]
The luminous flux aligned to the S-polarized light in this manner is bent at a plane 90 ° by a reflection mirror 931 arranged at a corner of the light guide 100 as shown in FIG. 924.
[0063]
As described above, since the illumination optical system 923 includes the polarization conversion element 920, the light use efficiency is increased as compared with the case where the random polarization in which the P-polarized light and the S-polarized light are mixed is used as it is, and the dichroic described later is used. The color separation at the mirrors 941 and 942 is improved. In addition, since the S-polarized light has a higher reflectance than the P-polarized light, there is also an advantage that a light amount loss or the like can be suppressed.
[0064]
4-2. Color separation optics and modulation system
As shown in FIG. 4B, the color separation optical system 924 includes a red-green reflection dichroic mirror 941, a green reflection dichroic mirror 942, and a reflection mirror 943.
[0065]
The blue luminous flux B included in the luminous flux emitted from the illumination optical system 923 passes through the red-green reflecting dichroic mirror 941 and is reflected at a right angle by the rear reflecting mirror 943. Emitted to the side.
[0066]
The red and green light beams R and G are reflected by the mirror 941, and only the green light beam G is reflected at a right angle by the green reflecting dichroic mirror 942, and is emitted from the emission part of the green light beam to the color combining optical system side. .
[0067]
The red light flux R that has passed through the mirror 942 is emitted toward the light guide system 927 from the emission part of the red light flux.
[0068]
Condensing lenses 951 and 952 are arranged on the emission side of the emission portions of the red light beam R and the green light beam G of the color separation optical system 924, respectively. The light beams emitted from each emission portion are collected by these light collection lenses 951 and 952. Is parallelized by
[0069]
The blue and green luminous fluxes B and G thus collimated enter the light valves 925B and 925G and are modulated, and image information corresponding to each color light is added.
[0070]
That is, these light valves 925B and 925G are switching-controlled by drive means (not shown) in accordance with image information, and thereby each color light passing therethrough is modulated.
[0071]
As such a driving unit, a known unit can be used as it is.
[0072]
On the other hand, the red light flux R is guided to the corresponding light valve 925R via the light guide system 927, where it is similarly modulated according to image information.
[0073]
The light guide system 927 includes an entrance lens 974, an entrance reflection mirror 971, an exit reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condenser lens 953 disposed in front of the light valve 925B. It is composed of
[0074]
The optical path length from the light source lamp unit 8 to each of the light valves 925R, 925G, and 925B is the longest in the case of the red light flux R, and therefore, the loss due to light diffusion is the largest in the case of red light. However, by arranging such a light guide system 927, it is possible to suppress the loss of red light to some extent.
[0075]
Note that the light valves 925R, 925G, and 925B in the present embodiment are liquid crystal light valves including a pair of polarizing plates and a liquid crystal panel disposed therebetween.
[0076]
4-3. Color synthesis optical system
Next, each color light beam modulated through each light valve 925R, 925G, 925B is incident on a prism unit 910 constituting a color synthesizing optical system, where it is recombined.
[0077]
Then, the color image formed by the re-synthesis is enlarged and projected on a screen at a predetermined position via the projection lens unit 6.
[0078]
As described above, in the present embodiment, the light beam emitted from the light source lamp unit 8 is reflected by the reflection mirror 931 in the light guide 100, and travels along the L-shaped optical path of a large roundabout along the L-shaped planar shape of the light guide 100. And reaches the color separation optical system 924 and the prism unit 910.
[0079]
Therefore, the optical path is set as long as possible while each optical system component is arranged in a narrow area. Therefore, while using a lens having a small F-number and securing a sufficient arrangement position of the integrator lenses 921 and 922 and the polarization conversion element 920, the light beam emitted from the light source lamp unit 8 is converted into a parallel light beam by the light valve 925R. , 925G, and 925B.
[0080]
In addition, since the arrangement positions of the integrator lenses 921 and 922 can be sufficiently widened, the number of divisions can be increased.
[0081]
Therefore, the integrator lenses 921 and 922 can be arranged in an optically reasonable state, and as a result, downsizing can be achieved. In addition, by making the integrator lenses 921 and 922 the same size, more telecentric illumination light can be obtained, so that each partial light flux formed on the polarization separation film 9204 of the polarization conversion element 920 is collected. Since the size of the image can be reduced and the variation in the size of each condensed image can be suppressed, the utilization efficiency of the illumination light can be increased.
[0082]
5. Light guide structure
In the above optical system, all the optical elements other than the light source lamp unit 8, the prism unit 910 constituting the color synthesizing unit, and the projection lens unit 6 are housed and arranged in the light guide 100 having the shape shown in FIG. ing. The light guide 100 includes an upper light guide 902 and a lower light guide 901, and the optical element is held between upper and lower light guides 901 and 902 while being sandwiched from above and below. The light source lamp unit 8 is housed in a light source lamp unit housing part 800 formed in the lower light guide 901.
[0083]
The upper light guide 902 and the lower light guide 901 are integrated with the prism unit 910 and the projection lens unit 6 via a head plate 903 described later, and are fixed to the lower case 4 with fixing screws. Therefore, rectangular cutouts 9001 and 9002 are formed on the lower surface of the lower light guide 901 and the upper surface of the upper light guide 902 to incorporate the prism unit 910 and the head plate 903.
[0084]
In addition, an opening 9004 is formed in the partition wall 9003 of the lower light guide 901 located near the light source lamp unit housing section 800 to cool the light source lamp unit 8.
[0085]
Further, openings 907 and 908 for cooling the light source lamp unit 8 are also formed on the side and bottom surfaces of the region 900 of the optical unit 10 where the illumination optical system 923 is stored.
[0086]
An opening 9021 is formed in the upper part of the upper light guide 902, and the opening 9021 and the above-described opening 9004 are connected to each other by a duct 9028.
[0087]
6. Head plate structure
The prism unit 910 is fixed to a front side (a front side in FIG. 7) of a thin head plate 903 which is a magnesium die-cast plate shown in FIGS. 7 and 8 by a fixing screw.
[0088]
The head plate 903 is basically composed of a vertical wall 91 extending vertically in the width direction of the apparatus and a bottom wall 92 extending horizontally from the lower end of the vertical wall 91 and supporting the prism unit 910. I have.
[0089]
At the center of the vertical wall 91, a rectangular opening 91b through which light emitted from the prism unit 910 passes is formed. The vertical wall 91 has four screw holes 91d for fixing the base end side of the projection lens unit 6, and two dowels 91e for positioning.
[0090]
In a portion of the bottom wall 92 corresponding to the mounting position of the prism unit 910, three communication holes 91g communicating with the lower surface of the bottom wall are formed at three places, and a mounting portion 91h of the prism unit 910 is formed on the communication hole 91g. .
[0091]
A screw hole 91c is formed in the attachment portion 91h, and the prism unit 910 is screw-fixed to the head plate 903 using the screw hole 91c.
[0092]
Supported portions for coupling the head plate 903 to a pair of support columns 40 (see FIG. 3) provided on the inner surface side of the lower case 4 are respectively provided on both sides of the opening 91 b in the vertical wall 91. A fixing surface 93 which is a part is provided. These fixing surfaces 93 project from the vertical wall 91 in parallel with the bottom wall 92 and are supported and fixed to the receiving surface 41 of the column 40 of the lower case 4. The fixing surface 93 is provided with a hole 93b and a screw hole 93c, respectively, and the receiving surface 41 of the support portion 40 is provided with a boss 41b and a screw hole 41c, respectively. Then, the boss 41b is engaged with the hole 93b provided in the fixing surface 93, and a screw is inserted into the screw hole 93c and the screw hole 41c, so that the fixing surface 93 and the support portion 40 are fixed. The fixing surface 93 and the support portion 40 need not necessarily be fixed, but by fixing the screws in this way, it is possible to solve the problem that the optical axis of the optical system is shifted due to an external impact or the like. is there.
[0093]
In the vertical wall 91, planar reinforcing ribs 93a orthogonal to the fixing surfaces 93 are erected, and the reinforcing ribs 93a are formed integrally with the fixing surfaces 93.
[0094]
As shown in FIG. 9, the fixing surface 93 is provided in the vertical wall 91 within a height range H from the upper end position to the lower end position of the outer shape of the projection lens unit 6. Specifically, the fixed surface 93 is provided at a position on the vertical wall 91 substantially at the same height as the optical axis 6A of the projection lens unit 6. In other words, the height position of the fixing surface 93 is within a height range of not less than one third and not more than two thirds from the lower end of the vertical wall 91, when the height of the entire vertical wall 91 is 1. ing. Note that the height position of the fixing surface 93 is more preferably two-thirds or more from the lower end of the vertical wall 91.
[0095]
7. Effects of the embodiment
According to the present embodiment, the following effects can be obtained.
[0096]
That is, since the fixing surface 93 of the head plate 903 is provided in a region within the height range H of the outer shape of the projection lens unit 6 on the vertical wall 91, the height of the center of gravity of the projection lens unit 6 and the height of the fixing surface 93 Can be substantially equal or the fixed surface 93 can be made higher, so that the bending stress generated at the root of the vertical wall 91 by the projection lens unit 6 can be efficiently reduced, and the bending or destruction of the vertical wall 91 can be reliably prevented.
[0097]
Therefore, since it is not necessary to provide a complicated reinforcing structure on the vertical wall 91, the structure of the head plate 903 can be simplified, and the projection lens unit 6 and the prism unit 910 can be accurately positioned via the vertical wall 91 without bending. Since positioning can be performed, displacement of the optical axis can be reliably prevented.
[0098]
The fixing surface 93 of the vertical wall 91, which is provided at substantially the same height as the optical axis 6A of the projection lens unit 6, protrudes from the vertical wall 91, and is used to reinforce the vertical wall 91. Can also be used for reinforcing ribs. Further, since the reinforcing ribs 93a perpendicular to the fixing surface 93 are provided upright on the vertical wall 91, the rigidity of the vertical wall 91 can be further increased by a simple structure by the reinforcing ribs 93a and the fixing surface 93. it can. Since the prism unit 910 and the projection lens unit 6 are fixed in a state where they are aligned with each other with the vertical wall 91 having excellent rigidity interposed therebetween, even if an impact force or the like is applied, the mutual displacement, that is, the light There is an advantage that the possibility of shaft displacement is extremely low.
[0099]
Further, since the head plate 903 is made of a magnesium molded product, the specific gravity can be reduced, so that the weight of the head plate 903, that is, the weight of the device 1 can be reduced, and excellent moldability can be secured. In addition, since the magnesium molded product has excellent heat dissipation, the prism unit 910 is easily mounted by mounting the prism unit 910 on the head plate 903 made of the magnesium molded product and supporting the prism unit 910 on the light guides 901 and 902. Can be prevented from becoming high temperature.
[0100]
Note that the present invention is not limited to the above-described embodiment, but includes the following modifications.
[0101]
That is, in the above-described embodiment, the supported portion is constituted by the fixing surface 93 projecting from the vertical wall 91 in parallel with the bottom wall 92. However, the present invention is not limited to this. The end may be extended in parallel with the vertical wall and screwed horizontally to the lower case. Alternatively, the supported portion may be a part of the vertical wall and the vertical wall may be directly connected to the lower case. May be fixed with screws. In short, as long as the height position of the supported portion connected to the lower case is within the height range from the upper end to the lower end of the outer shape of the projection lens unit, the shape of the supported portion is arbitrary.
[0102]
【The invention's effect】
According to the present invention as described above, the light source lamp unit, the color separation optical system, and the modulation system are housed and arranged in the light guide having a predetermined optical path, and the projection lens unit and the In a projection display device in which a color synthesizing optical system is integrated, a supported portion for coupling a head plate to a light guide is formed in an area within a height range from an upper end to a lower end of an outer shape of a projection lens unit on a vertical wall. The height of the center of gravity of the projection lens unit and the height of the supported part can be made almost the same, or the height of the fixed part can be increased, so that the load on the projection lens unit can be efficiently distributed to the light guide. It can be reliably prevented. Therefore, since it is not necessary to provide a complicated reinforcing structure on the vertical wall, the structure of the head plate can be simplified, and the projection lens unit and the color combining optical system can be accurately positioned via the vertical wall, so that the optical axis Misalignment can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a front view and a rear view illustrating a projection display device according to an embodiment of the present invention.
FIG. 2 is a top view and a bottom view in the embodiment described above.
FIG. 3 is a schematic perspective view illustrating an internal structure of a lower case portion of the outer case in the embodiment described above.
FIG. 4 is a horizontal sectional view illustrating an arrangement of an optical unit and a power supply unit and a structure of the optical unit in the embodiment.
FIG. 5 is a horizontal cross-sectional view and a schematic perspective view illustrating a structure of a polarization conversion element included in the illumination optical system according to the embodiment.
FIG. 6 is a schematic perspective view illustrating a structure of a light guide that houses the optical unit according to the embodiment.
FIG. 7 is a schematic perspective view illustrating a structure of a head plate supporting a prism unit serving as a color combining optical system in the above-described embodiment.
FIG. 8 is a perspective view showing a head plate in the embodiment described above.
FIG. 9 is a cross-sectional view illustrating a height position of a supported portion of a head plate in the embodiment.
[Explanation of symbols]
1 Projection display device
6 Projection lens unit
7 Power supply unit
8 Light source lamp unit
10 Optical unit
91 Vertical Wall
92 Bottom wall
93 Fixing surface (supported part)
93a Reinforcing rib
100 light guide
901 Lower light guide
902 Upper light guide
903 head plate
910 color synthesis optical system (prism unit)
923 Illumination optical system
924 color separation optical system
925R, 925G, 925B Modulation system (light valve)
R red luminous flux
G green luminous flux
B blue luminous flux

Claims (4)

An optical unit that optically processes a light beam emitted from the light source lamp unit to form an optical image corresponding to image information, and enlarges and projects this optical image on a projection surface by a projection lens unit; A power supply unit for supplying a light source lamp unit, an optical unit and an outer case for housing the power supply unit,
The optical unit is a color separation optical system that separates the light beam into light beams of a plurality of colors, a modulation system that modulates each of the separated light beams based on the image information and emits the light as a modulated light beam, A color combining optical system that combines the modulated light flux and emits the modulated light to the projection lens unit,
The projection lens unit and the color combining optical system are mounted on a head plate,
A support portion for supporting the head plate is provided in the outer case,
The head plate includes a vertical wall to which a base end side of the projection lens unit is fixed, a bottom wall extending in a horizontal direction from a lower end of the vertical wall to support the color combining optical system, and provided in the exterior case. And a supported part supported by the supporting part ,
The supported portion is provided on the vertical wall, and is provided within a height range from an upper end height position to a lower end height position of the outer shape of the projection lens unit of the vertical wall. A projection type display device characterized by the above-mentioned. The projection display device according to claim 1 ,
The projection type display device, wherein the supported portion is provided at a position on the vertical wall substantially at the same height as an optical axis of the projection lens unit. The projection display device according to claim 1 or 2 ,
The supported portion includes a fixed surface protruding from the vertical wall in parallel with the bottom wall and supported and fixed to the support portion, and a reinforcing rib orthogonal to the fixed surface is provided on the vertical wall. A projection display device. The projection display device according to any one of claims 1 to 3 ,
The projection type display device, wherein the head plate is made of a magnesium molded product.

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