JPH04266276A - Projection display device - Google Patents

Abstract

PURPOSE:To facilitate packing and transportation of a projection display device, to reduce the inventory space and to avoid various disadvantage at non-use due to a high height. CONSTITUTION:A display cabinet section 2 at a screen 5 and a light source cabinet section 3 at a projection unit 9 are formed separately. The display cabinet section 2 is formed to be elevated/descended with respect to the light source cabinet section 3. When the display device is in use, the display cabinet section 2 is raised, and when the light source cabinet section 3 is descended at non-use, the height of the display device is lowered.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device.

0002

[Prior Art] Transmissive projection display devices generally have a structure in which a lower portion includes a projection unit equipped with an image light source and a projection lens, an electric circuit section, etc., and an upper portion includes a reflecting mirror and a screen. All of these projection display devices were housed in one integrated cabinet.

0003

[Problems to be Solved by the Invention] As described above, the projection display device has a structure in which the projection unit is placed at the bottom and the reflector and screen are placed at the top, making the device tall and large. Become. For this reason, packaging and transportation were not easy and costly, and a large amount of space was required for inventory. Additionally, due to their height, there were often restrictions on where they could be installed, which meant less freedom in interior design. Also, for example, when installing in a conference room,
If installed in the front center of the room, it will get in the way when the device is not in use, so it is common to install it against the side wall of the room, but this poses the problem of making it difficult for people on the opposite side to see the screen.

The present invention has been made in view of the above circumstances, and it facilitates the packaging and transportation of a projection display device.
The purpose is to reduce inventory space and to eliminate various inconveniences when the device is not in use due to its height.

[0005]

[Means for Solving the Problems] A projection display device according to the invention as claimed in claim 1 which solves the above problems includes a display cabinet section housing a reflecting mirror and a screen, and a projection unit equipped with an image light source and a projection lens. The light source cabinet section is provided separately, and the display cabinet section is provided so as to be movable up and down while enclosing the light source cabinet section.

[0006] The projection display device according to claim 2 comprises:
This is a case in which a light source cabinet section is not provided, and is characterized in that the display cabinet section is simply provided so that it can be raised and lowered relative to the projection unit.

The projection display device according to claim 3 comprises:
The display cabinet according to claim 1 or 2 is characterized in that an elevating drive means for automatically elevating and lowering the display cabinet section is provided.

[0008]

[Operation] In the above configuration, when the apparatus is used, the display cabinet section is raised relative to the projection unit at the bottom. The image light emitted from the projection unit is reflected by the reflector on the back of the display cabinet, and projected onto the screen in front to display the image. When the device is not in use, the upper display cabinet can be lowered.
The height of the device can be reduced. In this case, in the display cabinet section, there is simply a space between the reflector on the rear side and the screen on the front side, so even if the display cabinet section is lowered, it will not interfere with the projection unit at the bottom.

[0009]

[Embodiment] Fig. 1 is a side sectional view of a projection display device according to an embodiment of the present invention, Fig. 2 is a front sectional view of the same, and Fig. 3 is Fig. 2
It is a sectional view taken along the line A-A in FIG. This projection display device 1 has an upper display cabinet section 2 and a lower light source cabinet section 3 provided separately, and the display cabinet section 2 includes the light source cabinet section 3 and is movable up and down. A back cover 2a is attached to the back surface of the display cabinet section 2, a reflecting mirror 4 is attached to the back cover 2a, and a screen 5 is provided on the front side. The light source cabinet section 3 houses a projection unit 8 that houses a light source 6, a liquid crystal panel 7, a projection lens 8, etc., and projects image light. The projection unit may of course be of a cathode ray tube type.

In this embodiment, an elevating drive means 20 is provided to automatically move the display cabinet section 2 up and down. This elevating drive means 20 includes a drive motor 10 fixed to the back wall of the light source cabinet section 3, a bevel gear 11 fixed to the output shaft of the drive motor 10, a bevel gear 12 meshing with the bevel gear 11, and a bevel gear 12 that meshes with the bevel gear 11. 12 is fixed and is rotatably supported at the upper rear side of the left and right side walls of the light source cabinet section 3, a horizontal shaft 13, a bevel gear 14 fixed to each end of this shaft 13, and a bevel gear 1 that meshes with each bevel gear 14.
5. A shaft 16 to which the bevel gear 15 is fixed and extends horizontally in the front and back direction on the left and right outer sides of the light source cabinet section 3; a bearing section 17 fixed to the light source cabinet section 3 side that rotatably supports this shaft 16; A pinion 18 is fixed to two places on the shaft 16 on the front side and the back side of the device, respectively.
The rack 19 is fixed to the inner surface of the left and right side walls of the display cabinet section 2, and includes a rack 19 that extends in the vertical direction and meshes with the pinion 18. Although not shown, a guide may be provided between the display cabinet 2 and the light source cabinet 3 to guide the vertical movement of the display cabinet section 2. Furthermore, the elevating and lowering driving means is not limited to the above mechanism, but various other mechanisms can be considered.

Next, the operation will be explained. When the device 1 is used, the display cabinet section 2 is raised as shown in FIGS. 1 to 3 described above and FIG. 4 showing the external appearance. The image light emitted obliquely upward from the rear side from the projection unit 9 is reflected by the reflecting mirror 4, and projected onto the screen 5 on the front side to be displayed as an image. When the device 1 is not in use, the bevel gears 11, 12 and shaft 13 are driven by the drive motor 10.
, the pinion 18 is driven through the bevel gears 14, 15, and the shaft 16, and when the rack 19 that engages with the pinion 18 is driven downward, the display cabinet section 2 integrated with the rack 19 moves into the light source cabinet section 3 as shown in FIG. The height of the device 1 becomes sufficiently low.

[0012] Therefore, packaging and transportation become extremely easy, and costs can be reduced. Additionally, inventory space in factories and distribution processes can be significantly reduced. For example, it can be installed near a window, which increases the degree of freedom in interior design. Furthermore, when installed in a conference room, for example, the height can be lowered to avoid getting in the way when not in use, and it can also be installed in the front center of the conference room so that everyone in the room can easily see it. In this case, the display cabinet of the device can be used as a podium when not in use, increasing the utility value of the projection display device itself. Additionally, there is no need for a dedicated installation space for the projection display device, allowing more space in the room.

Although the above-described embodiment is an independent projection display device, the light source cabinet section is not necessarily required, for example, when the projection display device is designed to double as a podium in a conference room. in this case,
The projection unit 9 can be installed directly on a part of the podium, and the display cabinet section 2 can be attached to the podium so that it can move up and down.

[0014] Furthermore, if it is necessary to frequently raise and lower the display cabinet section 2 while it is installed, a lifting drive device that automatically lifts and lowers it is practically essential, but it also facilitates packaging and transportation and saves inventory space. If the sole purpose is to reduce the size, etc., an elevating drive means is not necessarily required.

[0015]

[Effects of the Invention] According to the projection display device of claim 1, when not in use, the upper display cabinet section can be opened.
Since the lower light source cabinet section can be lowered inside the device, the height of the device can be made sufficiently low, making packaging and transportation extremely easy, and reducing costs. Additionally, inventory space in factories and distribution processes can be significantly reduced.

[0016] Since the height can be lowered when not in use, the degree of freedom in interior design is increased, such as being able to install it near a window, for example. Conventionally, when installed near a window in a living room, the height reduces the amount of light that gets in, but according to the present invention, the height can be lowered when not in use to brighten the room, and when in use, it can be extended to block out some light from the window. There is also the benefit of being able to enjoy the view.

[0017] For example, when installed in a conference room, the height can be lowered so that it does not get in the way when not in use, and it can also be installed in the front center of the conference room so that everyone in the room can easily see it. . In this case, the display cabinet of the device can be used as a podium when not in use, increasing the utility value of the projection display device itself. Additionally, there is no need for a dedicated installation space for the projection display device, allowing more space in the room.

When installed near a window in a living room, conventionally it is tall and therefore does not receive much light, but according to the present invention, when not in use, the height is lowered to brighten the room, and when in use, it is extended to let in some light from the window. It also has the advantage of being able to be viewed while shielding from light.

According to the projection display device of claim 2, for example, when the projection display device is designed from the beginning to also serve as a podium, the projection unit can be directly installed on a part of the podium, and the light source cabinet section can be omitted. .

According to the projection display device of the third aspect, the display cabinet section can be raised and lowered automatically, which is practical.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a projection display device showing one embodiment of the present invention.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a sectional view taken along the line A-A in FIG. 2;

FIG. 4 is a perspective view showing the appearance of the projection display device in use.

FIG. 5 is a perspective view showing the appearance when not in use.

[Explanation of symbols]

1. Projection display device 2 Display cabinet section 3 Light source cabinet part 4 Reflector 5 Screen 9 Projection unit 18 Pinion 19 Rack 20 Lifting drive means

Claims (3)

[Claims] Claim 1: A display cabinet section housing a reflecting mirror and a screen, and a light source cabinet housing a projection unit equipped with an image light source and a projection lens are separately provided, and the display cabinet section and the light source cabinet section are provided separately. 2. The projection display device according to claim 1, wherein the projection display device is enclosed and is movable up and down. 2. A projection display device characterized in that a display cabinet section housing a reflecting mirror and a screen is provided so as to be movable up and down with respect to a projection unit equipped with an image light source and a projection lens. 3. The projection display device according to claim 1, further comprising a lifting means for automatically driving the display cabinet section up and down.