JP5272889B2 - Projection-type image display device - Google Patents

Description

  The present invention relates to a structure of a projection type image display apparatus, and more particularly to a structure of a thin projection type image display apparatus having a small depth.

  In the projection type image display device, an image is displayed by projecting light from a light source onto a screen by an optical engine. The back cabinet or the like of the projection type image display apparatus is generally formed of a resin. However, as a result of long-term use, the back cabinet or the like may be deformed by a load of a component (creep phenomenon). In order to prevent deformation of the back cabinet, techniques relating to the structure of the projection type image display apparatus have been proposed. For example, Patent Literature 1 discloses a bottom cabinet on which an optical unit is mounted, a rear cover (back cabinet) supported by the bottom cabinet, a mirror attached to the rear cover, and a front cover having a screen on which image light is projected. In a rear projection type image display apparatus constituted by: a technique for providing a reinforcing member on the rear cover to prevent deformation such as bending of the rear cover.

  On the other hand, there is an increasing need for a thin projection-type image display device that can be attached to a wall surface in a room or has a small depth that requires a small installation area when placed on the floor. In order to reduce the depth, there is a method in which the mirror that reflects the image light is made non-planar so that the optical unit is miniaturized and included in the optical engine, and this optical engine is mounted on the bottom cabinet.

JP 2008-76901 A (page 9, FIG. 5)

  However, in the structure of such a conventional projection type image display apparatus, the angle of the projection light beam with respect to the screen becomes small. Therefore, for example, when the installed floor surface is not a perfect plane and there is a level difference in part, the bottom cabinet of the projection type image display device is deformed, and the deformation is transmitted to the plate or screen supporting the optical engine. The relative positional relationship between the optical engine and the screen shifts, and image displacement on the screen occurs.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a projection type image display apparatus capable of preventing image displacement on a screen.

  The projection-type image display apparatus according to the present invention includes an optical engine that gives video information to light and projects the light onto a screen, a screen frame that holds the screen, and an optical engine that is connected to the screen frame and holds the optical engine. A display unit having a support plate and a bottom frame connected to the display unit and supporting the weight of the projection type image display device are provided, and a strain absorbing portion is provided at a connection portion between the display unit and the bottom frame.

  The projection type image display apparatus according to the present invention can prevent image displacement on the screen.

It is a figure for demonstrating the optical system of the projection type image display apparatus which concerns on Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side sectional view schematically showing a configuration of a projection type image display apparatus before assembly according to Embodiment 1 of the present invention. It is a perspective view from the back side of the projection type image display apparatus after the assembly which concerns on Embodiment 1 of this invention. 1 is a vertical sectional view of a projection type image display apparatus according to Embodiment 1 of the present invention. It is a vertical sectional view in the case where there is a step on the floor surface of the projection type image display apparatus according to Embodiment 1 of the present invention. FIG. 2 is a vertical sectional view of the projection type image display apparatus according to Embodiment 1 of the present invention when the wall is hung. It is a vertical sectional view of a projection type image display apparatus according to Embodiment 2 of the present invention.

Embodiment 1 FIG.
FIG. 1 is a diagram for explaining an optical system of the projection type image display apparatus according to the first embodiment. In FIG. 1, the optical engine 1 includes a light source 101, a folding mirror 131, a non-planar mirror 12, and a folding mirror 132. The folding mirror 131 is provided on the upper side in the optical engine 1 with the reflecting surface facing backward and downward, and the non-planar mirror 12 is placed on the rear in the optical engine 1 and the reflecting surface faces forward and upward. Is provided.

  The light source 101 emits light toward the upper side of the optical engine 1, the folding mirror 131 reflects the light downward and downward, and the non-planar mirror 12 reflects the light upward and forward of the optical engine 1. As a result, light is emitted upward from the optical engine 1. The light emitted upward from the optical engine 1 is reflected by the folding mirror 132, and the reflected light is projected onto the screen 3. In this way, an image is displayed on the screen 3.

  FIG. 2 is a schematic side sectional view schematically showing the configuration of the projection type image display apparatus before assembly according to the first embodiment. FIG. 3 is a perspective view from the back side of the assembled projection type image display apparatus according to the first embodiment. A back cabinet that covers the back surface of the projection type image display apparatus is attached to the projection type image display apparatus. However, here, it is omitted in order to clarify the internal structure of the projection type image display apparatus. In the projection type image display apparatus according to the first embodiment, two installation methods are possible: a floor installation that is installed on the floor and a wall installation that is installed on the wall. explain.

  As shown in FIG. 2, the projection type image display apparatus according to Embodiment 1 includes a display unit 20 and a bottom frame 18 connected to the back surface of the display unit 20.

  The display unit 20 includes an optical engine 1, an optical engine support plate 22, a mirror holding frame 81, a folding mirror 132, a screen 3, a screen frame 4 that fixes the screen 3, a lower portion of the optical engine support plate 22, and the screen frame 4. And a reinforcing member 19 for holding

  The bottom frame 18 is connected to the display unit 20, contacts the floor surface, and supports the display unit 20 by standing on the floor surface.

  Main components constituting the display unit 20 will be described with reference to FIG. The optical engine 1 is fixed to the back surface of the optical engine support plate 22. A rectangular screen 3 on which an image is displayed is fitted into a screen frame 4 having a rectangular frame shape and fixed.

  The optical engine support plate 22 is installed obliquely from the back to the front from the top to the bottom of the projection type image display device, and the top of the optical engine support plate 22 is fixed to the mirror holding frame 81. The lower part of the optical engine support plate 22 is fixed to the screen frame 4 via the reinforcing member 19.

  The mirror holding frame 81 is disposed so as to surround the folding mirror 132, its left and right ends are fixed to the screen frame 4, and its center is fixed to the optical engine support plate 22. The folding mirror 132 is held by the mirror holding frame 81 and the screen frame 4 on the front surface.

  As shown in FIG. 3, the bottom frame 18 is connected to the display unit 20 at a lower connection point 75L and a connection point 75R, and an upper connection point 76L and a connection point 76R. Details of these connection points will be described later. To do. In the following, when it is necessary to distinguish between left (L) and right (R), for example, it is represented as a connection point 75L and a connection point 75R, and when both left and right are indicated, For example, the connection location 75 is described.

  In FIG. 3, the optical engine support plate 22 is provided with a light transmission hole 100 for transmitting light emitted upward from the optical engine 1. The light transmitted through the light transmitting hole 100 is reflected by the folding mirror 132 and the reflected light is projected onto the screen 3.

  The bottom frame 18 is provided on each of the right and left sides as viewed from the back of the projection type image display device, and the floors of the right bottom frame 181R and the left bottom frame 181L that are in direct contact with the floor, and the floors of the right bottom frame 181R and the left bottom frame 181L. A rectangular pillar-shaped right back frame 182R and left back frame 182L extending upward from the surface opposite to the surface in contact with the right bottom frame 181R and the left bottom frame 181L, respectively, and further to the right A quadrangular prism-shaped right back frame 183R and left back frame 183L extending from the back frame 182R and the left back frame 182L and extending in a direction inclined toward the display unit 20, and a right back frame 183R and a left back frame 183L, respectively. Back frame 185 connecting the right and back frame And a rear frame 180 connecting the lower portion of the 82R and left rear frames 182L.

  Further, the right rear frame 182R and the left rear frame 182L each include two screw holes 60 for connecting to the wall mounting bracket 200 located on the rear surface of the projection type image display apparatus in the case of wall mounting. . These screw holes 60 are not used when placed on the floor.

  FIG. 4 shows a vertical sectional view of the connecting portion between the bottom frame 18 and the optical engine support plate 22. In FIG. 4, only the right side as viewed from the back of the projection type image display device is shown, but the shape of the bottom frame 18 is bilaterally symmetrical, so the configuration on the left side is the same.

  As shown in FIG. 4, the bottom frame 18 extends in parallel with the right bottom frame 181R and the left bottom frame 181L from the right back frame 183R and the left back frame 183L, respectively, and the optical engine support plate 22 is provided. A right connection frame 184R and a left connection frame 184L. In addition, columnar protrusions 188 extending in the left-right direction are provided on the surfaces of the right bottom frame 181R and the left bottom frame 181L opposite to the surfaces in contact with the floor surface.

  Here, the bottom frame 18 and the optical engine support plate 22 are rotatably connected by the lower two connecting portions 75 and are movably connected by the upper two connecting portions 76.

  The upper connecting portions 76L and 76R can move in the vertical direction with respect to the bottom surface of the casing and in the depth direction of the casing, and are fixed in the horizontal direction so as not to move. In the two lower connection portions 75, the bottom frame 18 has a cylindrical protrusion 188 elongated in the horizontal direction. Further, the optical engine 22 includes an arc-shaped gripping portion 220 having a diameter slightly larger than the diameter of the cylindrical protrusion 188 at the lower end thereof. The gripping portion 220 gently grips the columnar protrusion 188 of the bottom frame 18. As a result, the optical engine support plate 22 can rotate within a range of a fixed angle around the cylindrical protrusion 188.

  As an example of a structure for realizing the connection method of the upper connection portions 76L and 76R, the projection type image display apparatus according to Embodiment 1 shown in FIG. 4 is configured as follows. In the connection portion 76, the optical engine support plate 22 is provided with one elongated hole on each of the right and left sides that is wider than the right connection frame 184R and the left connection frame 184L of the bottom frame 18 in a direction perpendicular to the floor surface. The frame 184R and the left connection frame 184L are inserted into these long holes, respectively. Further, the space portions of these long holes are filled with an elastic body 70 such as rubber. Thereby, in a state where no load is applied to the bottom frame 18, the right connection frame 184R and the left connection frame 184L are fixed by the rigidity of the elastic body 70, but when the load is applied to the bottom frame 18, As the elastic body 70 is deformed, the right connection frame 184R and the left connection frame 184L move in the vertical direction and the depth direction.

  Further, the bottom frame 18 is relatively less rigid than the optical engine support plate 22. This is because the material of the bottom frame 18 has a smaller Young's modulus than the material of the optical engine support plate 22, or the shape of the bottom frame 18 is relatively easy to deform than the shape of the optical engine support plate 22. Can be realized.

  Next, in the projection type image display apparatus according to Embodiment 1, the screen shift caused by the distortion of the display unit 20 can be hardly caused by the characteristic structure of the connection portion between the bottom frame 18 and the display unit 20. explain.

  If the floor surface on which the projection image display apparatus is installed is uneven, the bottom surface of the bottom frame 18 is deformed and distorted, and the influence is transmitted to the display unit 20. Here, if the display unit 20 is a rigid body, the display unit 20 is inclined with respect to the ground due to the unevenness of the floor surface. However, since the display unit 20 is not deformed, the relative positions of the optical engine 1 and the screen 3 do not change. No image shift occurs. However, actually, the display unit 20 is not a rigid body, and is deformed to generate distortion. Therefore, the bottom frame 18 is distorted by the unevenness of the floor surface, and the distortion is transmitted to the optical engine support plate 22 and further transmitted to the screen frame 4. As a result, the relative position between the optical engine 1 and the screen 3 is shifted and the screen 3 is shifted. Image displacement will occur.

  On the other hand, the projection type image display apparatus according to the present embodiment has a structure in which image displacement due to unevenness on the floor surface is unlikely to occur. FIG. 5 is a vertical sectional view in the case where there is a step on the floor surface of the projection display apparatus according to the first embodiment. The following description will be made on the right side of the bottom frame 18 based on FIG. 5, but the same applies to the left side.

  As shown in FIG. 5, it is assumed that a part of the floor surface that is in contact with the bottom surface of the bottom frame 18 (near the back surface portion of the bottom frame 18) is convex and the bottom frame 18R is deformed. In this case, as shown in FIG. 5, the bottom frame 18R is inclined toward the front surface of the housing with the connection portion 75R as the center, and the connection portion 76R of the bottom frame 18R is displaced toward the front surface of the housing. In the connecting portion 76R, the bottom frame 18R and the optical engine support plate 22 are movable in the vertical direction and the depth direction of the casing, so that the displacement of the connecting portion 76R of the bottom frame 18R does not affect the optical engine support plate 22 and stress Is also suppressed. As a result, even if the upper portion of the bottom frame 18R is displaced, the optical engine support plate 22 is not displaced.

  As described above, in the projection type image display apparatus according to the first embodiment, the connection point 75 and the connection point 76 between the bottom frame 18 and the display unit 20 constitute a strain absorption margin that absorbs the distortion of the bottom frame 18. Yes. As a result, the relative position between the optical engine 1 and the screen 3 does not change, and image displacement on the screen 3 can be prevented.

  Here, the bottom frames 18R and 18L are described separately. However, if the rigidity of the bottom frame 18 is relatively low, the deformation of the right side portion corresponding to the bottom frame 18R is the left side portion corresponding to the bottom frame 18L. Similarly, the left portions of the optical engine support plate 22 and the bottom frame 18 are not displaced.

  This effect is the same when a load that twists the casing is applied, and the displacement of the bottom frame 18 occurs, but the relative position between the optical engine 1 and the screen 3 does not change and the screen 3 It is possible to obtain an effect of suppressing the image shift.

  Next, even when the projection type image display apparatus according to Embodiment 1 is installed on a wall, the point that image displacement on the screen 3 can be prevented will be described, as in the case of floor placement.

  FIG. 6 is a vertical cross-sectional view of the projection type image display apparatus according to Embodiment 1 when hung on a wall. Here, the bottom frame 18 is installed on the wall surface 300 by fixing the back surface of the bottom frame 18 to the wall mounting bracket 200. When the floor surface is installed, the bottom surface of the bottom frame 18 is supported by the floor surface. However, as shown in FIG. 6, the bottom surface of the bottom frame 18 is not in contact with the floor surface when the wall surface is installed with the bottom surface of the bottom frame 18 on the wall surface 300. Under the load of components such as the support plate 22, the screen 3, and the screen frame 4, it can be deformed vertically downward.

  As a result of the deformation of the bottom surface of the bottom frame 18, the display unit 20 rotates around the connection portion 75 in the clockwise direction in the figure. At the connection portion 76, the bottom frame 18 and the optical engine support plate 22 are in the vertical direction of the casing. Since it is movable in the depth direction, the connecting portion 76R of the optical engine support plate 22 is displaced in the front direction of the casing. Although the deformation of the bottom frame 15 causes the displacement of the optical engine support plate 22, the deformation of the optical engine support plate 2 and the screen frame 4 does not occur. For this reason, the relative position between the optical engine 1 and the screen 3 does not change, and image displacement does not occur.

  As described above, in the structure of the projection type image display apparatus according to the present embodiment, the bottom frame 18 and the display unit 20 are connected via the strain absorption margin, so that the distortion of the bottom frame 18 is displayed. There is an effect that the image shift on the screen 3 can be reduced without being transmitted to the unit 20.

  In addition, there is an effect that the shift of the image on the screen 3 can be reduced even when the wall surface is installed.

Embodiment 2. FIG.
FIG. 7 is a side cross-sectional view before assembly, schematically showing the configuration of the projection type image display apparatus according to Embodiment 2 of the present invention. Here, only the right side will be described, but the configuration on the left side is the same.

  The basic configuration of the projection type image display apparatus according to the second embodiment is the same as that of the projection type image display apparatus according to the first embodiment. The difference between the second embodiment and the first embodiment is the structure of the lower connecting portion 77.

  In the first embodiment, as shown in FIG. 4, the lower connection portion 75 includes a bottom frame 18 having a cylindrical protrusion 188 that is elongated in the horizontal direction, and the optical engine support plate 22 at the lower end of the bottom frame 18. The cylindrical projection 188 has a circular arc shape slightly larger than the diameter of the circle, and includes a gripping portion 220 that gently grips the cylindrical projection 188. The optical engine support plate 22 rotates around the cylindrical projection 188. I was trying to move freely.

  On the other hand, in the present embodiment, the right bottom frame 189R of the bottom frame 28 has the low rigidity portion 190R whose rigidity is lower than the rigidity of the optical engine support plate 23, and the bottom frame 28 and the optical engine support plate 23 have a low rigidity. It is connected using connecting means such as a screw through the portion 190R.

  In this case, as described in the first embodiment, for example, it is assumed that a part of the floor shape is convex and the bottom frame 28 is deformed. At this time, the low-rigidity portion 190R of the bottom frame 28 is deformed due to low rigidity, and the optical engine support plate 23 rotates around the connection portion 77 as in the first embodiment, and the connection portion 76 of the bottom frame 28 is rotated. Is displaced toward the front of the housing. Since the bottom frame 28 and the optical engine support plate 22 are movable in the vertical direction and the depth direction of the housing in the connection portion 76, the displacement of the connection portion 76 of the bottom frame 28 has a small effect on the optical engine support plate 23. Generation of stress is also suppressed. As a result, even if the upper portion of the bottom frame 28, that is, the displacement of the connecting portion 75 occurs, the displacement of the optical engine support plate 2 can be suppressed. As a result, a change in the relative position between the optical engine 1 and the screen 3 can be suppressed, and screen displacement can be reduced.

  In addition, as a low-rigidity part, elastic bodies, such as rubber | gum and a leaf | plate spring, can be used, for example.

  As described above, in the second embodiment, the right bottom frame 189R of the bottom frame 28 has the low rigidity portion 190R whose rigidity is lower than the rigidity of the optical engine support plate 23, and the bottom frame 28 and the optical engine support plate 23 are. Are connected using a connecting means such as a screw through the low-rigidity portion 190R. Therefore, the bottom frame 28 is deformed at the connecting portion 76, so that the generation of stress on the optical engine support plate 23 is suppressed. There is an effect that the image shift can be reduced.

  DESCRIPTION OF SYMBOLS 1 Optical engine, 3 Screen, 4 Screen frame, 18 Bottom frame, 20 Display unit, 22 Optical engine support plate, 23 Optical engine support plate, 28 Bottom frame, 70 Elastic body, 75 Connection part, 76 Connection part 77 Connection part, 81 mirror holding frame, 132 folding mirror

Claims (5)

A display unit having an optical engine that gives image information to light and projects the light onto a screen, a screen frame that holds the screen, and an optical engine support plate that is connected to the screen frame and holds the optical engine;
A bottom frame that is connected to the display unit at at least one connection point and supports the display unit;
A projection-type image display device comprising:
A projection-type image display device, wherein at least one of the connection points between the display unit and the bottom frame constitutes a first strain absorption margin. The first strain absorption margin is formed by providing a connection hole in which an elastic body is disposed on an optical engine support plate, and a part of the bottom frame is inserted into the connection hole. 2. The projection type image display device according to 1. The connection location has a second strain absorption margin apart from the first strain absorption margin,
The second strain-absorbing margin grips the columnar projections of the optical engine support plate and the columnar projections so that the optical engine support plate can rotate around the columnar projections. The projection-type image display device according to claim 2, further comprising: a grip portion. The connection point has a third strain absorbing margin part separately from the first strain absorbing margin part,
In the third strain absorbing margin, the bottom frame has a low rigidity portion whose rigidity is lower than the rigidity of the optical engine support plate, and the bottom frame and the optical engine support plate are connected to each other through the low rigidity portion. The projection type image display apparatus according to claim 2, wherein the projection type image display apparatus is configured by being connected.   The projection type image display apparatus according to claim 4, wherein the low-rigidity part is an elastic body.

Images