JPH0442832Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is an LCD (Liquid Crystal Device) projection screen that is placed on the enlarged projection surface of an overhead projector (hereinafter abbreviated as OHP). This relates to the operating power supply device for the device.

[Conventional technology]

Conventionally, an OHP LCD projector 3 as shown in FIG. 4 is known which has a matrix liquid crystal display panel 2 on which an output image of a small computer 1 (for example, a personal computer) is directly displayed.
This LCD projector 3 has a plug insertion part 5 to which the signal cable 4 of the small computer 1 is connected, and a plug to which the power cord 6 is connected via a transformer 7 (a transformer that can reduce the voltage from 100V to about 5V). The LCD projector 3 is equipped with a power supply connection part 8 as an insertion part, and the LCD projector 3 is installed on an enlarged light projection surface 10 formed of an OHP 9 Fresnel lens plate, etc., and a power supply cord 6 is provided.
By inserting the plug 6a into a power outlet (general 100V power supply) (not shown), the image displayed by the small computer 1 on the liquid crystal display panel 2 can be enlarged and projected onto the screen from the head optical system 11 of the OHP 9. There is.

[Problem that the invention attempts to solve]

The operating power supply device for the conventional LCD projector 3 takes a general 100V power supply through a power cord 6 plugged into an outlet, lowers this 100V power to about 5V through a truss 7, and supplies the power input to the LCD projector 3. Since it is designed to carry electricity, it requires a long power cord 6, it requires an expensive transformer 7, and the power source to be used for export etc. must be considered, and since it uses a general power source, it does not require electricity. There were problems such as high costs, making it uneconomical.

[Means for solving problems]

As a means to solve the above conventional problems, the operating power supply device for the LCD projector of this invention has the following features:
A substrate 13 having a window hole 12 that matches the matrix liquid crystal display panel section 2 of the LCD projector 3 is provided.
A large number of solar cells 14 are arranged in parallel to generate electricity using light projected from 0, and the electricity obtained from the solar cells 14 is used as a power source for operating the LCD projector 3.

[Effect]

When the OHP 9 is turned on, a part of the light emitted from the OHP projection surface 10 is irradiated onto the solar cell 14, thereby obtaining the amount of electricity (for example, a voltage of about 5 V) necessary for operating the LCD projector 3. I can do it.

〔Example〕

An example of this invention is shown below in Figures 1 and 2.
To explain according to the drawing in the figure, this OHP LCD
The operating power supply for the projector is LCD projector 3.
window hole 1 that matches the matrix liquid crystal display panel section 2 of
2, this substrate 13 has
It is separate from the LCD projector 3, and is configured as a rectangular frame plate that is placed on the enlarged light projection surface 10 of the OHP 9 in a superimposed state as shown in FIG. On the back surface of the substrate 13, which is a frame plate, there are a number of solar cells 14 located in the outer area of the window hole 12 (receiving part of the light emitted from the light emitting surface 10 of the OHP 9, For example, a total of 100 solar cells that generate electricity of about 5V necessary as an operating power source for the projector 3 are installed in parallel, and the frame plate, that is, the substrate 1
The power cord 16 connected to the solar cell extending from the outer periphery of the LCD projector 3 is electrically connected to the power supply connection part 8 of the LCD projector 3 as shown in FIG.
It is used as an operating power source for the LCD projector 3.

FIG. 3 shows an operating power supply device for an LCD projector according to another embodiment of the present invention, in which the substrate 13 is
It is configured as a cover plate 3a on the back side of the main body having a window hole 12 that matches the matrix liquid crystal display panel 2, which is fixed to the back side of the main body of the LCD projector 3 with screws. A large number of solar cells 14 were embedded and fixed in the outer enclosure in the same arrangement as shown in Fig. 1, and the solar cells 14 and the power input section (not shown) of the LCD projector 3 were electrically connected inside the main body. It is structured as follows. Note that in the two embodiments described above, the solar cells 14 are arranged side by side in the substrate window hole 1.
It is also possible to change the outer enclosure to one side, two sides, or three sides of 2.

[Effect of idea]

The operating power supply device for the OHP LCD projector of this invention uses the solar cell 14 as described above,
The electricity required to operate the LCD projector 3.
Since it is obtained by using OHP9 light, there is no need for a long power cord like in the past, there is no need for an expensive transformer, and there is no need to consider the power source for export. Moreover,
Since it does not use a general power source, it also has an economical effect in that there is no electricity bill.

[Brief explanation of the drawing]

Figure 1 is a rear view of the operating power supply device for an LCD projector according to an embodiment of the present invention, seen from the back side, showing the overlapping state of the LCD projector, and Figure 2 shows the power supply unit installed on the projection surface of an OHP. FIG. 3 is a cross-sectional view showing an operating power supply device for an LCD projector according to another embodiment of the present invention; FIG. 4 is a cross-sectional view showing a conventional LCD projector as a compact computer OHP
FIG. 1...Small computer, 2...Matrix liquid crystal display board section, 3...LCD projector, 3a...Back cover plate of the projector body, 4...Signal cable,
5...Plug insertion part, 8...Power connection part, 9...
OHP (overhead projector), 10...
Enlarged light projection surface, 11...head optical system, 12...window hole, 13...substrate (frame board), 14...solar cell,
16...Power cord.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Used by being installed on the enlarged light projection surface of an overhead projector that has a translucent matrix liquid crystal display panel on which the output image of a small computer is displayed as is. This is an operating power supply device for an LCD projector, which includes a substrate that has a window hole that matches the matrix liquid crystal display panel of the LCD projector and faces the magnified light projection surface of the overhead projector. A feature is that a large number of solar cells that generate electricity using the light from an overhead projector are installed in parallel around the window hole, and the electricity obtained from the solar cells is used as the operating power source for the LCD projector. Operating power supply in LCD projector for overhead projector. (2) the LCD, wherein the substrate has a window hole that matches a matrix liquid crystal display panel portion of the LCD projector;
It is configured as a rectangular frame plate that is separate from the projector and is placed on the back surface of the LCD projector and installed on the enlarged light projection surface of the overhead projector, and extends from the outer periphery of this frame plate. LCD projection for an overhead projector according to claim 1 of the utility model registration claim, characterized in that the solar battery-connected power cord is used by electrically connecting it to the power supply connection part of the LCD projector. operating power supply in the device. (3) the substrate is fixed to the back surface of the main body of the LCD projector, and is configured as a cover plate on the back surface of the main body having a window hole that matches the matrix liquid crystal display panel section;
Utility model registration claim 1, characterized in that the solar cells arranged in parallel on the window hole outer part of the back cover plate of the main body and the power input section of the LCD projector are electrically connected inside the main body. An operating power supply device for an LCD projector for an overhead projector described in .