JPH05150365A - Overhead projector - Google Patents

Abstract

PURPOSE:To easily display the picture of an original with a simple constitution. CONSTITUTION:An overhead projector is provided with a scanner 13, a projector main body 1a, a liquid crystal display part 2 and a casing 1. The scanner 13 reads the picture drawn on the supplied original. The projector main body 1a and the liquid crystal display part 2 enlarge and project the picture read by the scanner 13. The casing 1 houses the scanner 13, the projector main body 1a and the liquid crystal display part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead projector for enlarging and projecting an image.

[0002]

2. Description of the Related Art An overhead projector (referred to as OHP) is a projection device that allows a large number of people to view the screen at the same time at a conference or lecture. As this OHP, an electronic OHP that has a transmissive liquid crystal panel provided in place of a normally used transparent film and magnifies and projects the display screen has already been developed.

As an electronic OHP of this kind, a personal computer or the like is connected and the image data created therein is displayed on a liquid crystal panel, and a flexible disk drive is provided, and the image data obtained therefrom is displayed on a liquid crystal. It is known to display on a panel.

[0004]

Of the above-mentioned conventional configurations, the configuration in which an external device such as a personal computer is connected is complicated and expensive, and the occupied space is also large. Among the conventional configurations, in the configuration in which the flexible disk drive device is provided, it is necessary to store image data as electronic information in the flexible disk in advance.

An object of the present invention is to make it possible to easily display an image of an original with a simple structure.

[0006]

An overhead projector according to the present invention comprises an image reading means, a magnifying projection means, and a case. The image reading means is for reading the image drawn on the supplied document. The magnifying and projecting means is for magnifying and projecting the image read by the image reading means. The case is for accommodating the image reading means and the magnifying projection means.

[0007]

In the overhead projector according to the present invention,
The image reading unit and the magnifying projection unit are housed in a case. When a document is supplied, the image drawn on the document is read by the image reading unit, and the read image is magnified and projected by the magnifying projection unit. It

Therefore, the image of the supplied document can be enlarged and projected without connecting a complicated external device. Thereby, the image of the document can be easily displayed with a simple configuration.

[0009]

1 shows an OHP according to an embodiment of the present invention. The OHP is provided with a case 1, and in the case 1, a projector main body 1a having a built-in light source, a liquid crystal display unit 2 fixed on the projector main body 1a, and a scanner 13 are housed. On the back of the case body 1,
A stay 3 is arranged so as to project upward and have its tip bent forward. At the tip of the stay 3, a head 6 equipped with a lens 4 and a reflecting mirror 5 for enlarging and projecting screen data displayed on the liquid crystal display unit 2 onto a screen (not shown).
Is attached. The lens 4 can be moved up and down, and the focus can be adjusted.

The liquid crystal display section 2 is provided with a liquid crystal display panel (hereinafter referred to as LCD) 7 which can be moved up and down by a driving means (not shown) at the center thereof. LCD7 is horizontal 64
It has a resolution of 0X 400 dots (256000 pixels) and can display an A4 size image. Also,
The LCD 7 is arranged so that the lateral direction thereof matches the lateral direction of FIG. The vertical movement of the LCD 7 is performed when changing the display magnification. A disk drive device (hereinafter, FD) for driving the flexible disk 8a is provided on the front surface of the case 1.
8), a light receiving section 10 for receiving an infrared signal from the remote controller 9, and a power switch 11. The IC card 12a is provided on one side of the liquid crystal display unit 2.
A card slot 12 for inserting a card is arranged.

The scanner 13 is for reading an image of a document to be displayed on the LCD 7, and is arranged on the other side surface of the liquid crystal display section 2. The scanner 13 has a document supply port 13a on the upper surface and a document discharge port 13b on the side surface. The scanner 13 employs a contact-type image sensor generally used in facsimiles and the like, and has a resolution of 640 dots (pixels), for example. Further, the document supply port 13a is set to be longer than the length of the A4 document in the longitudinal direction, and there is a document detection sensor (not shown) for detecting that the document is supplied, and the document supply. A size sensor (not shown) for determining the direction (horizontal or vertical) is arranged.

In addition to the original read by the scanner 13, the OHP includes a flexible disk 8a and an IC.
The image data recorded on the card 12a can also be displayed. This OHP has a CPU 21 as shown in FIG. The CPU 21 is the ROM 2 via the system bus 20.
2, FD interface 23, IC card interface 24, remote controller interface 25, scanner interface 37, display controller 26, and bus switch 27.

The ROM 22 stores a control program for controlling the OHP. The FD interface 23 is connected to the FDD 8. The IC card interface 24 is connected to the card slot 12. The remote controller interface 25 is connected to the light receiving unit 10. The scanner interface 37 is connected to the scanner 13. Display controller 26
Is a row driver 28 and a column driver 29 of the LCD 7.
And are respectively connected to and, and display them on the LCD 7 by controlling them. The bus switch 27 controls connection between the local bus 31 and the system bus 20.

A screen memory 32 is connected to the local bus 31. The screen memory 32 is a RAM that stores screen data in a bitmap format. Screen memory 3
The screen data stored in No. 2 is given to the column driver 29 and the row driver 28 via the local bus 31 and displayed on the liquid crystal panel 7. The screen memory 32 stores one screen of image data read by the scanner 13 or image data recorded on the flexible disk 8a or the IC card 12a.

Next, the OHP CP thus constructed
The control operation of U21 will be described. Note that FIG. 3 shows CP
The processing content of the main routine of U21 is shown. First, in step S1, the memory and registers in the CPU 21 are initialized. In step S2, the screen memory 3
Clear the contents of 2. In step S3, the remote controller 9
Wait for the display command from. When a display command is input by operating the remote controller 9, the process proceeds to step S4. Step S
In step 4, it is determined whether or not a document is set on the scanner 13. If no document is set on the scanner 13, the process proceeds to step S5. In step S5, FD
A reading process (described later) is executed. If it is determined that there is a document, steps S4 to S6.
Move to. In step S6, a scanner reading process (described later) is executed.

When the processing in step S5 or step S6 is completed, the process proceeds to step S7. In step S7, the remote controller 9 waits for a display end command to be input. When the display end command is input, the process proceeds to step S8. In step S8, the display controller 26 is instructed to end the display. In step S9, the bus switch 27 is controlled to connect the system bus 20 and the local bus 31 which are disconnected by the FD reading process or the scanner reading process. When the process in step S9 ends, step S2
Return to.

In the FD reading process in step S5, as shown in FIG. 4, first, in step S12, the display controller 26 is instructed to end the display, and the display on the LCD 7 is ended once. In step S13, the bus switch 27 is controlled to connect the system bus 20 and the local bus 31. In step S14, screen data is read from the flexible disk 8a (or the IC card 12a by the card slot 12) by the FDD 8. Step S1
In 5, the screen data read from the flexible disk 8a (or IC card 12a) is written in the screen memory 32. In step S16, a display routine is executed.

In the display routine, the display controller 26 is instructed to display in step S17. Step S1
8, the bus switch 27 is controlled and the system bus 32
And disconnect from the local bus 31. In step S19,
The row driver 28 and the column driver 29 are driven, and L
The screen data stored in the screen memory 32 is displayed on the CD 7. When the display routine ends in this way, the program returns to the main routine.

Further, in the read routine of step S6, as shown in FIG. 5, in step S21, the display controller 26 is instructed to end the display, and the display of the LCD 7 is temporarily ended. In step S22, the bus switch 27 is controlled to connect the system bus 20 and the local bus 31. In step S23, the image data of the original is read by the scanner 13. In step S24, it is determined whether or not the document has been laterally supplied to the document supply port 13a. This determination is made by a size sensor arranged near the document detection sensor. When it is determined that the document is supplied in the vertical direction instead of the horizontal direction (step S24 returns N
O), the process proceeds to step S25. Step S25
Then, reduction processing of the read image data is performed.

In step S26, the image data of the original document or the image data of the reduced original document is written in the screen memory 32. In step S27, the display routine shown in FIG. 4 is executed. Here, even when a document is supplied in the vertical direction, by performing reduction processing, all image data of one document can be displayed on the LCD 7 at once. The above-mentioned reduction processing is performed as follows.

As described above, the scanner 13 can read an image with 640 dots in the main scanning direction.
The display area of the CD 7 is 640 horizontal × 400 vertical. Therefore, it is possible to display the original document fed in the horizontal direction as it is, but when it is supplied in the vertical direction, a part of the original document cannot be displayed as it is. For this reason,
As shown in FIG. 6, for a document fed in the horizontal direction, an image is displayed in an area of 570 dots in the horizontal direction × 400 dots in the vertical direction, and a non-display area of 35 dots is provided at both ends. If the original is fed in the vertical direction,
An image is displayed in an area of dots × 400 dots in the vertical direction, and an undisplayed area of 180 dots is provided at both ends.

[0022]

In the OHP according to the present invention, since the image reading means and the magnifying and projecting means are housed in the case, the image of the original can be easily read and displayed with a simple structure without connecting a complicated external device. ..

[Brief description of drawings]

FIG. 1 is a perspective view of an OHP according to an embodiment of the present invention.

FIG. 2 is a block diagram of a liquid crystal display unit.

FIG. 3 is a flowchart showing a main routine of a CPU.

FIG. 4 is a flowchart showing an FD reading routine and a display routine.

FIG. 5 is a flowchart showing a scanner reading routine.

FIG. 6 is a diagram showing a display area in a document supply direction.

[Explanation of symbols]

 1 Case 1a Projector Main Body 2 Liquid Crystal Display 13 Scanner

Claims (1)

[Claims] 1. An image reading means for reading an image drawn on a supplied original document, a magnifying projection means for magnifying and projecting the image read by the image reading means, the image reading means and the magnifying projection means. An overhead projector including a case for accommodating and.