JP2008145962A - Rear projection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear projection apparatus which is capable of increasing a temperature difference between air discharged through the exhaust port of an optical block and air sucked from the inlet of an air path and supplied to the optical block and improves heat capture efficiency to be able to enhance a cooling effect on the optical block. <P>SOLUTION: The rear projection apparatus is constituted which includes: a cabinet 2 which has an opening 2a and in which a reflecting mirror 3 is attached thereto; an optical block 21 for projecting video light toward the reflecting mirror; a screen frame covering the front face of the cabinet 2; and a separator 7 for partitioning the reflecting mirror 3 and the optical block 21. The separator 7 is provided with the air path for air for cooling the optical block, and the optical block 21 is provided with an exhaust port 41a through which air passing in the optical block 21 is discharged, and the air suction port 83 of the air path is disposed in a position distant from the exhaust port. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rear projection device that reflects image light emitted from an image light projection device by a reflection mirror and projects the image light on the back side of a screen and displays an image on the screen.

  As a conventional rear projection apparatus of this type, there is an apparatus described in Patent Document 1, for example. Patent Document 1 describes a projector device suitable for use in a rear projection television or the like that uses a transmissive liquid crystal panel. The projector disclosed in Patent Document 1 includes an optical prism unit having a liquid crystal panel and a dichroic prism that modulate red light, green light, and blue light, respectively, and a PS conversion element for polarizing light from a light source lamp. An optical system unit, a cooling means for cooling the optical system unit, and an exterior cabinet assembled with the optical system unit and the cooling means. A sirocco fan, a first air passage for cooling the sirocco fan through the first duct and guiding the air to the optical prism unit, and a blast fan from the sirocco fan through the second duct. The first wind path that is led to the PS conversion element and is cooled is a second wind that is partitioned by a partition wall. The warm air warmed for cooling from the first air passage and the second air passage is led into the exterior cabinet to normal temperature, and is returned to the sirocco fan from the intake port. It is characterized by that.

According to the projector apparatus having such a configuration, “warm warm air after cooling the PS converter is discharged into the exterior cabinet through the second air passage, and thus the PS converter cooling effect is enhanced. It can be expected that the effect such as “paragraph [0010] of the specification” can be expected.
JP 2006-91143 A

  However, the projector device described in Patent Document 1 has an optical unit including a light source lamp, a PS converter, a light valve including three liquid crystal panels and an output-side polarizing plate. The optical unit includes an intake port through which air for cooling the light valve and the PS converter is sucked, a first duct for discharging the warm air heated by cooling the light valve and the PS converter, and the like. Is provided. And the inlet port from which air is sucked and the first duct from which hot air is discharged are arranged at positions close to each other.

  FIG. 21 is a perspective view for explaining the rear projection television 100 on which the above-described optical unit is mounted. As shown in FIG. 21, the rear projection television 100 includes an upper cabinet 101 formed of a housing having an opening 101a on the front surface, and a lower cabinet 103 that supports the upper cabinet 101 from below and on which an optical unit 102 is mounted. A screen frame (not shown) that closes the opening 101a of the upper cabinet 101 is provided.

  An opening 101 b that exposes the optical unit 102 mounted on the lower cabinet 103 is provided on the surface of the upper cabinet 101 facing the lower cabinet 103. The opening 101 b is a vent through which the warm air discharged from the first duct 102 a of the optical unit 102 and the air sucked into the suction port (not shown) of the optical unit 102 pass. That is, the intake port for intake of air that cools the optical unit 102 and the exhaust port for exhausting warm air discharged from the optical unit 102 are provided integrally (at close positions).

  Therefore, the warm air discharged from the first duct 102a of the optical unit 102 is sucked again as air for cooling the optical unit 102 without being sufficiently cooled, and is discharged from the first duct 102a. The difference in temperature between the air (warm air) and the air that is sucked from the inlet and cools the optical unit 102 is small. As a result, there is a problem that the efficiency of taking heat from the light valve or PS converter, which is a heat source device provided in the optical unit 102, so-called heat capturing efficiency is lowered, and the cooling effect of the light valve or PS converter is lowered.

  The problem to be solved is that, in the conventional rear projection apparatus, there are an exhaust port through which air (warm air) heated by cooling the optical unit is exhausted, and an intake port through which air that cools the optical unit is sucked. Since they are provided close to each other or integrally, the heat capturing efficiency is lowered and the cooling effect of the optical unit is lowered.

  A rear projection apparatus according to the present invention includes a cabinet having an opening opened on the front surface and having a reflection mirror mounted therein, and an optical block that is housed in the cabinet and projects image light toward the reflection mirror. A screen frame that holds the screen on which the image light reflected by the reflection mirror is projected and covers the front surface of the cabinet; and a separator that is housed inside the cabinet and partitions the reflection mirror and the optical block. ing. The separator is provided with an air path for air that is sucked from the space on the reflection mirror side to cool the optical block, and an exhaust port that discharges the air passing through the optical block to the space on the reflection mirror side. The most important feature is that the air inlet is disposed at a position away from the exhaust.

  According to the rear projection device of the present invention, the temperature difference between the air discharged from the exhaust port of the optical block and the air sucked from the air port intake port and supplied to the optical block can be increased. The cooling efficiency of the optical block can be enhanced by improving the thermal efficiency.

  A rear projection device capable of enhancing the cooling effect of the optical block by providing an air passage through which air for cooling the optical block passes in the separator and disposing the air inlet of the air passage away from the exhaust port of the optical block. Was realized with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 20 show examples of embodiments of the present invention. 1 is a perspective view seen from the front side showing a first embodiment of a rear projection apparatus according to the present invention, FIG. 2 is an exploded perspective view of a structural component, and FIG. 3 is a state in which a projection main body is mounted on a cabinet. FIG. 4 is an explanatory view showing a state where a separator is attached from the state shown in FIG. 3, and FIG. 5 is a perspective view showing a cabinet.

  6 is a perspective view showing the optical block, FIG. 7 is an exploded perspective view of the optical block, FIG. 8 is a perspective view of the optical block, and FIG. 9 is a perspective view of the upper block shown in FIG. 10 is a perspective view of the shielding plate shown in FIG. 7, FIG. 11 is a perspective view of the intermediate block shown in FIG. 7, FIG. 12 is a perspective view of the lower block shown in FIG. 7, and FIG. FIG. 14 is a schematic view showing the configuration of the optical unit, and FIG. 15 is a perspective view of an adapter member that connects the optical unit and the upper block. 16 is a perspective view of the separator as viewed from the front side, FIGS. 17A and 17B are perspective views of the separator as viewed from the back side, FIG. 18 is a cross-sectional view of the separator in the vertical direction, and FIG. FIG. 20 is an explanatory diagram illustrating air passing through the optical block.

  First, a rear projection television 1 showing a first embodiment of a rear projection apparatus according to the present invention will be described with reference to FIGS. The rear projection television 1 is a so-called television receiver. The rear projection television 1 displays video (image) by emitting video light from an optical block having an image display device such as a CRT or LCD element, reflecting the video light by a reflection mirror, and enlarging it onto a screen. To do.

  As shown in FIGS. 1 to 4, the rear projection television 1 is reflected by the cabinet 2 having the opening 2 a having the entire front surface opened, the reflection mirror 3 attached to the cabinet 2, and the reflection mirror 3. A screen 4 on which image light is projected, a screen frame 5 that holds the screen 4 and covers the opening 2a of the cabinet 2, a projection body 6 having an optical block 21 mounted inside the cabinet 2, and a projection body 6 and a separator 7 for partitioning between the reflecting mirror 3 and the like.

  As shown in FIGS. 2 and 5 and the like, the cabinet 2 is formed of a hollow casing having an opening 2a on the front surface. The cabinet 2 has a substantially rectangular mounting surface portion 2b on which the projection body 6 is mounted and a substantially rectangular shape that is substantially perpendicular to one end of the mounting surface portion 2b opposite to the opening 2a on the long side. A rear surface portion 2c formed so as to form an upper surface, an upper surface portion 2d that is continuous with the rear surface portion 2c at a predetermined inclination angle and to which the reflection mirror 3 is attached, and a short side on the left side of the mounting surface portion 2b. It is composed of a left side surface portion 2e that is continuous vertically and a right side surface portion 2f that is substantially perpendicular to the short side on the right side of the mounting surface portion 2b.

  A plurality of mirror engaging pieces 11 are provided on the inner surface of the upper surface portion 2d. The lower side portion of the reflecting mirror 3 is engaged with the mirror engaging piece 11. A connector opening 14 that exposes an external connector portion of a chassis block 25 to be described later is provided on the right side of the back surface portion 2c. Further, on the left side of the back surface portion 2c, a lattice-like cooling window 16 is provided for allowing outside air or the like to pass through in order to cool a light source block 24 described later.

  The left side surface portion 2e and the right side surface portion 2f are provided with a cleaning hole 12a into which a predetermined cleaning tool can be inserted when cleaning the reflection mirror 3 and the like attached inside the cabinet 2. A lid 12b is attached to the cleaning hole 12a by screws or the like. Thereby, the cleaning hole 12a is sealed by the lid 12b. Further, the left side surface portion 2e and the right side surface portion 2f are provided with guide step portions 17 for guiding the positioning of the separator 7 and the fitting of the separator 7 during assembly. The height of the guide step portion 17 from the placement surface portion 2b is set so that the back surface portion 2c side is higher than the opening portion 2a side of the cabinet 2. A first engagement hole portion 18 and a second engagement hole portion 19 which are support portions of the present invention are provided at predetermined intervals in the left-right direction on the opening portion 2a side of the placement surface portion 2b. A first engagement hole 18 and a second engagement hole 19 are provided at predetermined intervals in the left-right direction on the opening 2a side of the placement surface 2b.

  The reflection mirror 3 is formed in a substantially trapezoidal plate shape whose lower side is shorter than the upper side. The size of the reflecting mirror 3 is set so as to cover most of the upper surface portion 2d of the cabinet 2. The reflecting mirror 3 is attached to the cabinet 2 by a mirror holder 15 with the lower side engaged with the mirror engaging piece 11 on the upper surface 2d.

  The mirror holder 15 includes a left mirror holder 15a that holds the left side portion of the reflection mirror 3, a right mirror holder 15b that holds the right side portion, and an upper mirror holder 15c that holds the upper side portion. These three mirror holders 15a, 15b, and 15c are screwed to the upper surface portion 2d.

  As shown in FIGS. 1 and 2, the screen frame 5 is composed of a horizontally-long frame-shaped member that forms a rectangle. The screen frame 5 includes a rectangular base frame 5a, a decorative frame 5b attached to the front side of the base frame 5a, a screen 4 disposed on the back side of the base frame 5a, and the screen 4 as a base frame 5a. It is configured with a screen frame that does not appear in the figure that is fixed to the screen.

  The base frame 5 a is set to a size corresponding to the opening of the cabinet 2. The decorative frame 5b is disposed so as to surround the outer periphery of the screen 4 exposed from the front surface of the base frame 5a. The decorative frame 5b is fixed to the base frame 5a by fixing means such as screws. Furthermore, a lower side portion, which is one side of the long side of the decorative frame 5b, is provided with a speaker hole (not shown) composed of fine holes and a guide light hole (not shown) into which a guide light for displaying an operation is inserted.

  The screen 4 is configured by a combination of a Fresnel lens disposed on the reflection mirror 3 side and a lenticular lens disposed on the opposite side of the Fresnel lens to the reflection mirror 3. The screen 4 is interposed between a base frame 5a and a screen frame (not shown), and the screen frame is fixed to the base frame 5a by screws.

  As shown in FIG. 3, the projection main body 6 has an optical block 21 mounted at a substantially central portion in the left-right direction of the mounting surface 2 a of the cabinet 2 and one side in the left-right direction when viewed from the opening 2 a of the cabinet 2. The light source block 22 is mounted, and the chassis block 23 is mounted on the other side in the left-right direction when viewed from the opening 2 a of the cabinet 2.

  The light source block 22 has a light source 26 (see FIG. 14) that irradiates light to the optical block 21 and a cooling device that cools the light source 26. An example of the light source 26 is a high-intensity discharge lamp. The chassis block 23 includes a control device that drives and controls the optical block 21 and the light source block 22. The chassis block 23 is provided with a cooling fan 27 for cooling the control device and the like. Further, the rear surface of the chassis block 23 has an external connector portion to which a USB connector or the like is connected.

  As shown in FIGS. 6 to 12, the optical block 21 is mounted between the upper block 31, the intermediate block 32, the lower block 33, and the upper block 31 and the intermediate block 32 which are stacked and assembled in the vertical direction. And an sirocco fan 35 showing a specific example of a fan device mounted between the intermediate block 32 and the lower block 33.

  As shown in FIG. 9 and the like, the upper block 31 includes a unit facing portion 41 that faces the optical unit 34, a cylindrical portion 42 that is continuous with one side of the unit facing portion 41, and the like. The unit facing portion 41 of the upper block 31 is formed of a substantially rectangular frame, and the opening serves as an exhaust port 41a through which air heated by the optical unit 34 is discharged. The cylindrical portion 42 of the upper block 31 is continuous with one long side of the unit facing portion 41 and extends in the vertical direction. The upper end of the cylindrical portion 42 is opposed to an outlet of a later-described air passage 84 of the separator 7, and the lower end is opposed to the intermediate block 32. Further, the upper block 31 is provided with a shielding plate 43 that closes a part of the exhaust port 41a.

  As shown in FIG. 10 and the like, the shielding plate 43 includes a main body plate 43a that blocks a part of the exhaust port 41a, and a partition piece 43b that projects downward continuously from one side of the main body plate 43a. As shown in FIG. 4, the partition piece 43 b of the shielding plate 43 is disposed on the air inlet 83 side, which will be described later, of the separator 7 in the assembled state of the projection device 1. Thereby, the air heated by the optical unit 34 can be advanced to the side opposite to the air inlet 83 of the separator 7. The shielding plate 43 also has a role as a shielding plate that blocks the light so that the light emitted from the optical unit 34 is not reflected on the reflection mirror 3.

  As shown in FIG. 11 and the like, the intermediate block 32 includes a unit attachment portion 45 to which the optical unit 34 is attached, a fan cover portion 46 that is continuous with the unit attachment portion 45 and covers the upper part of the sirocco fan 35, and the like. Has been. The unit mounting portion 45 of the intermediate block 32 is provided with three first vent holes 47a at positions corresponding to three sets of light valves 72 (to be described later) of the optical unit 34, and a PS converter (to be described later) of the optical unit 34. A second ventilation hole 47 b is provided at a position corresponding to 62. The second ventilation holes 47b and the three first ventilation holes 47a are communicated with the blower opening of the sirocco fan 35 in the assembled state of the optical block 21.

  The fan cover portion 46 of the intermediate block 32 is formed in a concave shape having a plurality of step portions when viewed from below, and the size thereof is set to a size corresponding to the size of the sirocco fan 35. An opening window 48 formed in a lattice shape is provided at a position facing the intake port of the sirocco fan 35 on the upper surface (the concave bottom surface) of the fan cover portion 46. Between the opening window 48 and the sirocco fan 35, a dust collecting filter 49 for collecting dust contained in the air is attached. Further, the cylinder portion 42 of the upper block 31 is opposed to the side of the opening window 48 opposite to the side on which the dust collection filter 49 is attached.

  As shown in FIG. 12 and the like, the lower block 33 is formed of a substantially rectangular plate. On the upper surface of the lower block, a sirocco fan 35 is placed via a vibration-proof rubber not shown. A first engagement piece 51 and a second engagement piece 52 that are engaged with the unit mounting portion 45 of the intermediate block 32 are provided on the upper surface of the lower block 33. The first and second engagement pieces 51 and 52 are engaged with the unit mounting portion 45 of the intermediate block 32, whereby the second ventilation hole 47b and the three first ventilation holes 47a of the intermediate block 32 A passage that communicates the air outlet of the sirocco fan 35 is formed.

  As shown in FIG. 13 and the like, the optical unit 34 includes an illumination system base 55 on which an illumination system such as a PS converter and a color separation mirror is mounted, and a liquid crystal prism system on which a liquid crystal prism system such as a liquid crystal panel and a cross prism is mounted. A base 56 and a lid member 57 attached to the upper part of the illumination system base 55 are provided.

  The illumination system base 55 of the optical unit 34 is formed of a substantially rectangular cylinder. Inside the illumination system base 55, as shown in FIGS. 13 and 14, a fly-eye lens group 61, a PS converter 62, two color separation mirrors (dichroic mirrors) 63 and 64, and three reflection mirrors. An illumination system such as 65, 66, 67, three condenser lenses 68R, 68G, 68B and three incident side polarizing plates 69 is mounted.

  The liquid crystal prism system base 56 of the optical unit 34 is made of a plate having an appropriate thickness, and one plane is attached to one surface of the illumination system base 55. On one plane of the liquid crystal prism base 56, three sets of light valves 72 comprising three liquid crystal panels 70R, 70G, 70B and three output side polarizing plates 71, which are liquid crystal devices, and a color combining cross prism A liquid crystal prism system such as (Dichroic Prism) 73 is mounted.

  A reflection mirror 75, a projection lens 76, and the like are mounted on the other plane of the liquid crystal prism base 56. Further, the liquid crystal prism base 56 is provided with a through-hole not shown in the figure between a cross prism 73 provided on one plane and a reflection mirror 75 provided on the other plane. A lens group 74 is provided between the cross prism 73 and the reflection mirror 75.

  The PS converter 62 is formed by pasting together strip-shaped glass coated with a dielectric with an adhesive. In the assembled state of the optical unit 34, three incident side polarizing plates 69 mounted on the illumination system base 55 are arranged on the incident side of the liquid crystal panels 40 R, 40 G, 40 B mounted on the liquid crystal prism base 56. These three incident-side polarizing plates 69 are bonded to the condenser lenses 68R, 68G, and 68B through thin glass plates, respectively.

  On the emission side of the liquid crystal panels 70R, 70G, and 70B, three emission side polarizing plates 71 mounted on the cross prism 73 via thin glass plates are arranged. A flexible wiring board 78 is connected to each of the liquid crystal panels 70R, 70G, and 70B. The ends of these three flexible wiring boards 78 opposite to the liquid crystal panels 70R, 70G, 70B are connected to a control device (not shown) of the chassis block 23. Accordingly, the liquid crystal panels 70R, 70G, and 70B are electrically connected to a control device (not shown) of the chassis block 23.

  The lid member 57 of the optical unit 34 is a substantially rectangular plate that matches the shape of the upper part of the illumination system base 55. The lid member 57 is provided with a notch 57a for avoiding contact with the three condenser lenses 68R, 68G, 68B and the three incident side polarizing plates 69 mounted on the illumination system base 55. The notch 57a is formed to be large from one short side to the center of the lid member 57.

  Next, with reference to FIG. 14, the image projection mechanism by the light source 26 and the optical block 21 provided in the light source block 22 will be described. First, the light emitted from the light source 26 provided in the light source block 22 is made uniform by the fly-eye lens group 61 and the polarization direction is made uniform by the PS converter 62. Then, the light whose polarization directions are aligned is separated into light of three colors R (red), G (green), and B (blue) by the reflecting mirrors 65, 66, and 67 and the color separation mirrors 63 and 64. .

  The light of the three colors irradiated to the liquid crystal panels 70R, 70G, and 70B through the condenser lenses 68R, 68G, and 68B and the incident side polarizing plate 69 is modulated by the image signal, and the transmittance is controlled through the output side polarizing plate 71. The In this way, the images formed on the liquid crystal panels 70R, 70G, and 70B are combined as one video light by the cross prism 73. The image light passes through the lens group 74, is reflected by the reflection mirror 75, and is emitted to the projection lens 76. The image light is projected onto the screen 4 through the projection lens 76.

  In the optical unit 34 having such a configuration, the lower part of the illumination system base 55 is fixed to the intermediate block 32 of the optical block 21, and the lid member 57 is fixed to the upper block 31 of the optical block 21 via the adapter member 59. . As shown in FIG. 15 and the like, the adapter member 59 has a planar shape substantially the same as that of the lid member 57. The adapter member 59 is formed of a substantially rectangular frame, and is continuously horizontal to one side of the frame portion 59a. And an arm portion 59b extending in the direction. The adapter member 59 of the adapter member 59 is opposed to the notch portion 57 a of the lid member 57. Thereby, the air blown from the three first ventilation holes 47a provided in the intermediate block 32 of the optical block 21 is sent to the upper block 31 through the illumination system base 55 of the optical unit 34 and the frame portion 59a of the adapter member 59. be able to.

  As shown in FIGS. 16 to 18, the separator 7 is configured as a plate body bent in a substantially L shape. The separator 7 includes a first surface portion 7a having a substantially rectangular shape, and a second surface portion 7b continuous from the one end of the long side of the first surface portion 7a at a predetermined inclination angle. In the assembled state of the rear projection television 1, the first surface portion 7 a covers the upper surface of the projection main body 6, and the second surface portion 7 b covers the front surface of the projection main body 6. By covering the upper surface and the front surface of the projection main body 6, the separator 7 plays a role of dust-proofing the projection main body 6 and circulates between the reflection mirror 3 side space inside the cabinet 2 partitioned by the separator 7 and the projection main body 6 side space. It plays a role as a sealing action for making. Further, the separator 7 itself serves as a reinforcing member, which improves the strength of the rear projection television 1 as a whole. As a result, the number of parts can be reduced because there is no need to provide support columns unlike the conventional rear projection apparatus.

  A projection opening 81 is provided substantially at the center of the first surface portion 7a. The projection aperture 81 is penetrated by the projection lens 76 of the optical block 21 or the image light projected from the projection lens 76. The projection opening 81 also has a role as a vent through which warmed air exhausted from the exhaust port 41a of the optical block 21 passes from the projection main body 6 side space portion to the reflection mirror 3 side space portion. . Furthermore, a plurality of step portions 82 are provided in a stepped manner on the first surface portion 7a in order to increase the surface strength.

  In addition, an intake port 83 for sucking air for cooling the optical block 21 is provided at one end portion of the long side located on the opposite side of the long side continuous with the second surface portion 7b in the first surface portion 7a. An air path 84 through which air passes from the air inlet 83 toward the optical block 21 is provided on the side of the first surface portion 7a facing the projection body 6.

  As shown in FIGS. 17A and 17B and the like, the air passage 84 is expanded in the vertical direction continuously to the shelf 85 extending in the horizontal direction continuously to the first surface portion 7a and to the shelf 85. It is formed from two side portions 86a and 86b. The shelf portion 85 is formed of a horizontally long plate having a substantially rectangular shape, and its long side extends in a direction parallel to the longitudinal direction of the first surface portion 7a. The long side of the shelf portion 85 is set to a length from the position corresponding to the air inlet 83 of the first surface portion 7a to the substantially central portion in the longitudinal direction of the first surface portion 7a.

  A notch 85a is provided on the long side of the shelf 85 opposite to the first surface 7a. The notch 85 a is disposed at a position away from the air inlet 83 and faces the cylindrical portion 42 of the optical block 21 in the assembled state of the rear projection television 1. Further, the two side surface portions 86a and 86b are respectively continuous with the two short sides of the shelf portion 85, and the respective leading ends thereof are continuous with the first surface portion 7a. The air passage 84 having such a configuration is closed by the cabinet 2 when the rear projection television 1 is assembled. Thereby, the air passage 84 is formed as a passage between the separator 7 and the cabinet 2, and the notch 85 a of the shelf 85 is formed as an outlet of the air passage 84.

  As shown in FIGS. 17A, 17B, and 18, two speaker installation holes 89 are provided in the second surface portion 7b with a predetermined interval in the left-right direction. As shown in FIG. 16 and the like, the speaker devices 90 are fitted into the two speaker installation holes 89, respectively, and are fixed to the second surface portion 7b by fixing means such as screws. A wiring board mounting portion 92 is provided on the left side of the approximate center of the second surface portion 7b, and a wiring board 93 provided with a remote control light receiving portion is attached to the wiring board mounting portion 92. In addition to the speaker device 90 and the wiring board 93, various accessory devices such as an operation panel and an input terminal for connecting AV equipment may be attached to the second surface portion 7b.

  A separator reinforcing member 94 is attached to the lower end of the second surface portion 7b in order to increase the strength of the separator 7. The separator reinforcing member 94 extends in the left-right direction and is set to a predetermined length. Further, the separator reinforcing member 94 is made of a metal material that can exhibit a sufficiently large strength, such as a steel material.

  Furthermore, a first engagement hook portion 96 is provided at a position corresponding to the first engagement hole portion 18 provided in the cabinet 2 at the lower end portion of the second surface portion 7b. Similarly, the 2nd engagement hook part 97 is provided in the position corresponding to the 2nd engagement hole part 19 provided in the cabinet 2 in the lower end part of the 2nd surface part 7b. In this embodiment, an example has been described in which the engagement hole portions 18 and 19 and the engagement hook portions 96 and 97 are provided so that two combinations of the engagement hole portion and the engagement hook portion are provided. Of course, the number of combinations of the engagement hole portion and the engagement hook portion may be one set or three or more.

  A vibration absorbing member made of rubber, cushion, elastic plastic or the like may be provided on a part of the outer periphery of the separator 7. This vibration absorbing member can prevent the vibration of the speaker device 90 from propagating to the cabinet 2. Furthermore, the gap between the cabinet 2 and the separator 7 can be eliminated, and the dustproof effect of the projection body 6 can be further improved.

  The rear projection television 1 having such a configuration can be assembled as follows, for example. First, the reflection mirror 3 is attached to the upper surface portion 2 d of the cabinet 2. That is, the lower side portion of the reflecting mirror 3 is engaged with the plurality of mirror engaging pieces 11 of the cabinet 2. Then, the upper side, the left side, and the right side of the reflection mirror 3 are screwed to the upper surface 2 d of the cabinet 2 by the mirror holder 15.

  Next, the projection main body 6 is inserted from the opening 2a of the cabinet 2 into the placement surface 2b. That is, the optical block 21 is mounted at the center of the mounting surface portion 2b, the light source block 24 is mounted on one side when viewed from the opening 2a of the cabinet 2, and the chassis block 25 is mounted on the other side. At this time, the cooling fan 27 provided in the chassis block 25 is exposed from the fan opening 13 provided in the back surface portion 2 c of the cabinet 2. Similarly, the external connector portion provided in the chassis block 25 is exposed from the connector opening portion 14 provided in the back surface portion 2 c of the cabinet 2. Then, the three blocks 23, 24 and 25 mounted on the cabinet 2 are electrically connected by a connector (not shown).

  As a result, the assembling work of the projection main body 6 and the electrical connection processing between the blocks 23, 24, and 25 can all be performed from the opening 2a provided on the front surface of the cabinet 2, so that the assembling work and the wiring process are extremely easy in a wide field of view. Can be done. As a result, it is possible to surely check the half-insertion of the connector and the like, so that it is possible to reliably prevent an electrical connection failure, and therefore it is possible to improve the product yield. Further, the reflection mirror 3 that reflects the image light on the screen 4 and the optical block 21 that projects the image light on the reflection mirror 3 are housed in the cabinet 2. Therefore, the reflecting mirror 3 and the optical block 21 can be easily and accurately arranged at predetermined positions corresponding to each other, and the optical accuracy can be improved.

  Next, the speaker device 90 is fitted into the speaker installation hole 89 of the separator 7 and fixed by screwing. Further, the wiring board 93 is attached to the wiring board attachment portion 92 of the separator 7. Thereby, the separator assembly 98 comprised from the separator 7, the speaker apparatus 90, etc. is assembled.

  Next, the separator assembly 98 is fitted along the guide step 17 provided on the left side 2e and the right side 2f of the cabinet 2. At this time, the first engagement hole 18 and the first engagement hook 96 are locked, and similarly, the second engagement hole 19 and the second engagement hook 97 are locked. . Thereby, the separator assembly 98 is fixed inside the cabinet 2. At the same time, the projection lens 76 of the optical block 21 passes through the projection opening 81 provided in the separator 7.

  In addition, although the present Example demonstrated the example which provided the engagement hook parts 96 and 97 and the engagement hole parts 18 and 19 as a fixing means to the cabinet 2 of the separator 7, it is not limited to this. For example, not only the engagement hook portions 96 and 97 are engaged with the engagement hole portions 18 and 19, but also fixing means such as screws may be used.

  By fixing the separator assembly 98 inside the cabinet 2, the space between the reflection mirror 3 and the projection body 6 is partitioned. Accordingly, the projection main body 6 can be dust-proofed, and a sealing action for creating a circulation between the reflection mirror 3 side space inside the cabinet 2 partitioned by the separator 7 and the projection main body 6 side space can be obtained. . Furthermore, since the separator assembly 98 serves as a reinforcing member, the strength of the cabinet 2 is improved, and deformation such as bending can be prevented from occurring in the cabinet 2.

  Next, the screen 4 is interposed between the screen frame and the base frame 5a, and the screen frame is fixed to the base frame 5a by screwing the screen frame to the base frame 5a. The decorative frame 5b is screwed and fixed to the front surface of the base frame 5a to which the screen 4 is fixed. Thereby, the screen assembly 99 including the screen 4, the base frame 5a, the screen frame, and the decorative frame 5b is assembled.

  The screen assembly 99 is screwed to the front surface of the cabinet 2 so as to cover the opening 2a of the cabinet 2 to which the separator assembly 98 is fixed. Thereby, the rear projection television 1 is assembled.

  Next, the flow of air for cooling the optical block 21 will be described with reference to FIGS. 4, 19, and 20. FIG. 19 shows the projection main body 6 and the separator 7 as viewed from the back side, and is an explanatory view for explaining the air passing through the air passage 84 provided in the separator 7. FIG. 20 shows the optical block 21 and the like which are sectioned in the vertical direction, and is an explanatory diagram for explaining the air passing through the optical block. As shown in FIG. 4 and the like, the air that cools the optical block 21 is sucked from the air inlet 83 of the separator 7. As shown in FIG. 19, the air sucked from the air inlet 83 passes through the air passage 84 of the separator 7 and enters the cylindrical portion 42 provided in the upper block 31 of the optical block 21 from the notch 85a.

  The air that has entered the cylinder portion 42 of the upper block 31 passes through the cylinder portion 42 and enters the fan cover portion 46 through the opening window 48 of the intermediate block 32. The air that has entered the fan cover 46 passes through the dust collection filter 49 and is then blown by the sirocco fan 35 to the three first ventilation holes 47a and the second ventilation holes 47b (see FIG. 11 and the like). . The air exiting from the three first vent holes 47a and the second vent holes 47b passes through the illumination system base 55 of the optical unit 34, respectively. At this time, the air passing through the illumination system base 55 cools by taking heat from the liquid crystal prism system and the illumination system.

  At this time, since the three first vent holes 47a are opposed to the three sets of light valves 72, which are heat source devices in the liquid crystal prism system, three sets of air are discharged from the three first vent holes 47a. The light bulb 72 can be positively applied. Thereby, heat can be efficiently taken from the three sets of light valves 72, and the cooling effect of the entire liquid crystal prism system can be enhanced. Similarly, since the second ventilation hole 47b faces the PS converter 62, which is a heat source device in the illumination system, the air emitted from the second ventilation hole 47b can be positively applied to the PS converter 62. Thereby, heat can be efficiently taken from the PS converter 62.

  The air heated through the illumination system base 55 passes through the frame portion 59a of the adapter member 59 and is exhausted from the exhaust port 41a provided in the unit facing portion 41 of the upper block 31 to the reflection mirror side space portion. At this time, since the exhaust port 41a that exhausts the heated air and the intake port 83 that intakes the air supplied to the optical block 21 are located at a distance from each other, the air that reaches the intake port 83 can be sufficiently cooled. As a result, the temperature difference between the air sucked from the air inlet 83 and supplied to the optical block 21 and the air heated by cooling the optical block 21 can be increased, and the cooling effect of the optical block 21 is enhanced. Can do.

  Further, the warmed air exhausted from the exhaust port 41 a is directed to the side opposite to the intake port 83 of the separator 7 by the shielding plate 43. Therefore, the exhausted warm air can be largely circulated in the reflecting mirror side space, and the air returned to the intake port 83 can be made lower than when the shielding plate 43 is not attached. As a result, the cooling effect of the optical block 21 can be further enhanced.

  As described above, according to the rear projection device of the present invention, the air passage for cooling the optical block is provided, and the air inlet of the air passage is disposed at a position away from the air outlet of the optical block. The cold air can be sucked from the air inlet of the air passage. As a result, the temperature difference between the air sucked from the intake port and supplied to the optical block and the air exhausted after the optical block is cooled and warmed can be increased, and the cooling effect of the optical block is enhanced. be able to.

  Further, according to the rear projection device of the present invention, the shield plate that covers a part of the exhaust port of the optical block is provided, and the partition plate is formed on the shield plate, so that the warm air exhausted from the exhaust port is blown into the air passage. It was made to face the other side of the air intake. Therefore, the exhausted warm air can be largely circulated in the space on the reflection mirror side, and the air reaching the intake port can be further cooled.

  In addition, since the three first vent holes are provided in the optical block, and the three first vent holes are opposed to the three sets of light valves of the liquid crystal prism system, the air from the three first vent holes is It can be actively applied to three sets of light valves that are heat source devices. As a result, heat can be efficiently taken from the three sets of light valves, and the cooling effect of the entire liquid crystal prism system can be enhanced.

  The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, an example in which a rear projection television is applied as a rear projection device has been described. However, the present invention can also be applied to a personal computer, a display device of a gaming machine, and other rear projection devices.

It is the perspective view which looked at the rear projection television which concerns on the 1st Example of the rear projection apparatus of this invention from the front side. It is a disassembled perspective view of the main structure parts concerning the 1st example of the rear projection device of the present invention. It is explanatory drawing which shows the state which mounted the projection main body in the cabinet which concerns on the 1st Example of the rear projection apparatus of this invention. It is explanatory drawing which shows the state which mounted the projection main body and the separator in the cabinet which concerns on the 1st Example of the rear projection apparatus of this invention. It is a perspective view which shows the cabinet which concerns on the 1st Example of the rear projection apparatus of this invention. It is a perspective view of the optical block which concerns on the 1st Example of the rear projection apparatus of this invention. It is the perspective view which decomposed | disassembled the optical block which concerns on the 1st Example of the rear projection apparatus of this invention, and was seen from diagonally upward. It is the perspective view which decomposed | disassembled the optical block which concerns on the 1st Example of the rear projection apparatus of this invention, and was seen from diagonally downward. It is a perspective view of the upper block concerning the 1st example of the rear projection device of the present invention. It is a perspective view of the shielding board attached to the upper block which concerns on the 1st Example of the rear projection apparatus of this invention. It is a perspective view of the intermediate block concerning the 1st example of the rear projection device of the present invention. It is a perspective view of the lower block concerning the 1st example of the rear projection device of the present invention. It is a disassembled perspective view of the optical unit which concerns on the 1st Example of the rear projection apparatus of this invention. It is a schematic diagram which shows the structure of the optical block and light source which concern on the 1st Example of the rear projection apparatus of this invention. It is a perspective view of the adapter member which concerns on the 1st Example of the rear projection apparatus of this invention. It is the perspective view which looked at the separator which concerns on the 1st Example of the rear projection apparatus of this invention from the front side. FIGS. 17A and 17B show a separator according to a first embodiment of the rear projection apparatus of the present invention, FIG. 17A is a perspective view seen from the right side of the back side, and FIG. 17B is a perspective view seen from the left side of the back side. . 1 is a cross-sectional view in which a separator according to a first example of a rear projection apparatus of the present invention is cut in a vertical direction. It is explanatory drawing explaining the flow of the air which cools the optical block which concerns on the 1st Example of the rear projection apparatus of this invention, and explaining the air which passes the air path of a separator. It is explanatory drawing explaining the flow of the air which cools the optical block which concerns on the 1st Example of the rear projection apparatus of this invention, and explaining the air which passes through the inside of an optical block. It is a rear projection television concerning the conventional rear projection apparatus, and is explanatory drawing explaining the flow of the air which cools an optical unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rear projection television (rear projection apparatus), 2 ... Cabinet, 2a ... Opening part, 2c ... Back part, 3 ... Reflection mirror, 4 ... Screen, 5 ... Screen frame, 6 ... Projection main body, 7 ... Separator, 7a ... 1st surface part, 7b ... 2nd surface part, 21 ... Optical block, 22 ... Light source block, 23 ... Chassis block, 26 ... Light source, 31 ... Upper block, 32 ... Middle block, 33 ... Lower block, 34 ... Optical unit, 35 Sirocco fan (fan), 47a ... first ventilation hole, 47b ... second ventilation hole, 55 ... illumination system base, 56 ... liquid crystal prism system base, 57 ... lid member, 62 ... PS converter, 70R, 70G, 70B ... Liquid crystal panel, 72 ... Light valve, 76 ... Projection lens, 81 ... Morphism opening, 83 inlet, 84 ... air passage, 85 ... ledge, 85a ... notch, 86a, 86b ... side surface portion

Claims (6)

A cabinet having an opening opened in the front and having a reflection mirror mounted inside;
An optical block that is housed inside the cabinet and projects image light toward the reflecting mirror;
A screen frame that holds a screen on which the image light reflected by the reflecting mirror is projected and covers a front surface of the cabinet;
A separator that is housed inside the cabinet and partitions between the reflecting mirror and the optical block;
The separator is provided with an air passage for air that is sucked from the space on the reflection mirror side to cool the optical block, and the air passing through the optical block is discharged to the space on the reflection mirror side in the optical block. The rear projection device is characterized in that an exhaust port is provided, and an intake port of the air passage is disposed at a position away from the exhaust port.   The optical block is provided with a shielding plate that blocks a part of the exhaust port, and a partition piece that directs the air exhausted from the exhaust port to the side opposite to the intake port is formed on the shielding plate. The rear projection apparatus according to claim 1. The optical block has a liquid crystal prism system and an illumination system,
The rear projector apparatus according to claim 1, wherein the air passing through the optical block cools the liquid crystal prism system.   The rear projection apparatus according to claim 1, wherein the air passage is formed as a passage between the separator and the cabinet.   The rear projection apparatus according to claim 1, wherein a fan is provided in the optical block, and the air for cooling the optical block is forcedly circulated.   2. The rear projection apparatus according to claim 1, wherein the optical block is disposed in the center of the cabinet, and the air inlet is provided at at least one corner of the separator on the side where the reflection mirror is attached.

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