JPH01105921A - Overhead projector - Google Patents

Abstract

PURPOSE:To improve projecting efficiency by providing a computer adding and deleting graphic data and a reflecting mirror deflecting a beam passing through an enlargement lens by almost 90 deg.. CONSTITUTION:The enlargement lens 5 is positioned on the upper part of a liquid crystal display device 1 which is supported by a column 6, and the reflecting mirror 7 is arranged on the upper part of the enlargement lens 5 so that the reflecting face of said mirror can be almost 45 deg. with respect to the optical axis of the enlargement lens 5. After graphic data to be projected are written on a floppy disk with a wordprocessor, said data are inserted into a floppy disk device 12. With the aid of programs in a personal computer 11, the graphic data are sequentially displayed on the liquid crystal display device 1. Images displayed on the liquid crystal display device 1 are backlighted by a lighting lamp 2, are enlarged by the enlargement lens 5, and are deflected almost 90 deg. by the reflecting mirror 7. The enlarged image 9 is projected on a screen 8. Since the title overhead projector employs a personal computer and a liquid crystal display device, it is excellent in projecting efficiency.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to Overherad projectors.

[Conventional technology]

A conventional overherad projector deflects the light beam by approximately 90 degrees after passing through a lamp that illuminates the illumination film, a magnifying lens and a magnifying lens placed opposite the film surface, in addition to the characters and figures drawn on it. It is composed of a reflecting mirror.

Next, a conventional over-rad projector will be described with reference to the drawings.

FIG. 2 is a perspective view showing an example of a conventional over-herad projector.

The overherad projector shown in FIG. 2 is constructed by placing a film 21 on which characters and figures are drawn on a glass plate 24 on the top of a box 23 containing an illumination lamp 22, and a magnifying lens supported by a support 26. 25 enlarges the characters and figures on the film 21, and a reflecting mirror 27 projects an enlarged image 29 onto a screen 28.

[Problem that the invention seeks to solve]

In the conventional overherad projector described above, when a large number of films are used, the films are separated one by one, making handling them complicated, and when corrections are to be made, the films must be remade. Inferior\
I got a point.

[Means for solving problems]

The overherad projector of the present invention includes a display device that displays an image, a storage device that stores image data of the image, a computer device that adds and deletes the image data, and a screen displayed on the display device. It includes a magnifying lens disposed to face each other and a reflecting mirror that deflects the light beam passing through the magnifying lens by approximately 90 degrees.

〔Example〕

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention.

The Overherad projector shown in FIG.

A liquid crystal display device 1 that displays characters and figures is connected to a lighting screen 2.
It is placed on the diffusion plate 4 on the top surface of the box 3 containing the. A magnifying lens 5 is attached to the top of the liquid crystal display device 1 and a support 6 is attached to the box 3.
The upper VC of the magnifying lens 5 and the optical axis of the magnifying lens 5 are approximately 456 liquid crystal display devices LL1. is connected to the virtual computer 1 by a cable 16. The personal computer 1 has a built-in floppy disk device 12,
A CRT display device 13 and a keyboard 14 are connected.

Here, the image data to be projected is usually written on a floppy disk using a word processor or the like and then inserted into the floppy disk device 12. Next, the image data is sequentially displayed on the liquid crystal display device 1 by a program in the personal computer 1. The image displayed on the liquid crystal display device 1 is illuminated from the back side by an illumination lamp 2, magnified by a magnifying lens 5, and reflected by a reflecting mirror 7 to an approximately 90"
It is deflected and an enlarged image 19 is projected onto the screen 18 .

Furthermore, the characters and figures to be displayed can be modified using the CRT display device 13 and keyboard 14 using a program in the personal computer 1.

〔Effect of the invention〕

Since the Overherad projector of the present invention uses a personal computer and a liquid crystal display device, it is not necessary to use conventional film. Since text and figures can be easily corrected, it has the effect of being extremely convenient when projecting.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional example. l...Liquid crystal display device, 2.22...Illumination lamp, 3.23...Box, 4...Diffusion plate, 5,25... ...Magnifying lens, 6.26...
...Strut, 7.27 ...Reflection L 8
．． 28...Screen, 9,29...
...Enlarged image, to...Cable, 11...
... Personal computer, 12 ... Floppy disk device, 13 ... CRT display device,
14...Keyboard, 21...Film, 24...Glass plate. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] a display device that displays an image; a storage device that stores image data of the image; a computer device that adds and deletes the image data; and an enlargement device that is disposed opposite to the screen displayed on the display device. An overhead projector comprising: a lens; and a reflecting mirror that deflects the light beam passing through the magnifying lens by approximately 90 degrees.