JPH0420176A - In-screen instruction device for large projection screens - Google Patents

Abstract

PURPOSE:To attain good indication within a screen by providing a pointing mark projecting means to project a pointing mark on a screen face, a projecting position control means to control the projecting position of the pointing mark projecting means and a transmitting means to transmit a control signal to the projecting position control means. CONSTITUTION:A directional signal transmitted from a position setter 10 is given to a receiving/control system 6, an optical path from a pointing mark projector 8 is changed by that a rotational, mirror 9 is driven and the projecting position of a pointing mark on a screen is changed. Then, the pointing mark stays a position by stopping button operation at the position where the pointing mark is located at the required position by the button operation of the position setter 10. Besides, the position of the pointing mark does not move unless the button operation is executed even when a hand to hold the position setter 10 moves. Thus, good indication within the screen can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a display device for a large projection screen that displays images such as characters and figures on a screen, and particularly to a large projection screen that can display pointing marks. This invention relates to a screen-based instruction device on a screen.

(Prior Art) Conventionally, various types of display devices have been used to project images such as characters and figures onto a screen.

Overhead projectors, slide projectors, etc.
It projects a real image from a film, etc.

Also known are devices that project a video or personal computer output screen onto a large screen. This is a device that connects the output to a transmissive liquid crystal display and projects it as an image, and can provide images with a greater variety than those that use real images.

These display devices are often used in various lectures and explanations, where a lecturer or the like advances the talk while adding explanations to the screen or referring to the screen. During the explanation process, pointing marks are displayed on the screen to point out the points on the screen.

FIG. 2 shows an example of this. In the figure, 21 is a projector, 22 is a screen, 23 is a projected image, 24 is a pointing mark projector with a built-in laser beam oscillator, 2
5 is a bointing mark.

The pointing mark projector 24 projects a pointing mark 25 using a laser onto a screen (2).It is made small, and the speaker holds it in one hand and projects the pointing mark at the required location while giving instructions. I'm so talented.

However, since the projected pointing mark is held in the hand, it moves as the speaker and other bodies move, and the pointing mark trembles due to minute hand movements. Therefore, in order to perform the in-screen finger 5 well, considerable skill is required.

(Problem to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances. To provide an in-screen indicating device for a projection type large screen, in which the position of a mark can be fixed at a stable position without movement or vibration, and the position of the indication can be smoothly moved. It is a huge thing.

(Means for Solving the Problems) The present invention provides an on-screen instruction device for a large projection screen, which includes an image projection means for projecting images such as characters and figures onto a screen surface, and a pointing mark for projecting a pointing mark onto the screen surface. The present invention is characterized by comprising a pointing mark projection means, a projection position control means for controlling the projection position of the pointing mark projection means, and a transmission means for sending a control signal to the projection position control means.

(Function) The present invention provides that, in a large projection screen, pointing marks are projected onto images such as characters and figures projected onto the screen surface by a pointing mark projection means controlled by a projection position control means. Therefore, the position of the pointing mark does not change unless a control signal is given to the projection position control means, and stable instructions can be given. In other words, the control signal to the projection position control means is given by the transmitting means, and therefore, even if the transmitting means is held by the speaker, etc., the displayed pointing will not change unless a position change signal is given. The position of the mark does not change, and the position does not change unnecessarily.

(Embodiment) FIG. 1 is a schematic configuration diagram for explaining an embodiment in which the present invention is applied to a sliding projection screen display device.

In the figure, 1 is a light source, 2 is a projection original image, 3.4 is a projection optical system,
5 is a half mirror, 16 is a receiving/control system, 7 is a receiving antenna, 8 is a pointing mark projector using a small laser, 9 is a rotating mirror, 10 is a position setting device, and 11 is a transmitting antenna. The projection original image 2 is illuminated by the light source 1,
The projection optical systems 3 and 4 project the image onto a screen (not shown). The ability to project a different screen by exchanging the original projection image is exactly the same as in a general slide-type projection screen display device. A pointing projector 8 is used to project pointing marks onto this projected screen. The pointing mark projector 8 is configured by a spot image formed by a laser diode or by arranging laser diodes in a predetermined pattern.
The irradiated light is reflected by the rotating mirror 9, guided by the half mirror 5 into a light beam of a projected image, and projected onto the above-mentioned screen. The rotating mirror 9 is connected to the reception/control system 6
The pointing mark is rotated by a motor and can change the position of the pointing mark on the screen. A control signal to the reception/control system 6 is sent from the position setting device 10.

The position setting device 10 has, for example, four buttons that can set up, down, left, and right directions, and transmits a direction signal instructed by the button with the transmitting antenna 11, receives it with the receiving antenna 7,
It sends it to the reception/control system 6.

The operation will be explained. The direction signal transmitted from the position setting device 10 is given to the reception/control system 6, and the rotating mirror 9
is driven. As a result, the optical path from the pointing mark projector is changed, and the projection position of the pointing mark on the screen is changed. When the pointing mark is at a desired position by button operation of the position setting device 10, if the button operation is stopped, the pointing mark remains at that position. Since the movement is performed by a motor, smooth movement is possible.

Further, even if the hand holding the position setting device 10 moves, the position of the pointing mark remains unchanged unless a button is operated. The position setting device 10 is provided with an on/off button,
The pointing mark can also be erased from the screen by stopping the emission of laser light.

In addition, in the above-mentioned embodiment, the light flux from the pointing mark projector was introduced into the light flux of the projected image.
Separately, the image may be projected onto the screen surface.

Further, the shape and position of the pointing mark may be controlled by inserting a liquid crystal plate in the middle of the optical path to control transmission of the light beam.

The operation signal from the position controller is not limited to wireless, and can use any known signal transmission means such as wired or ultrasonic signals, and the operation means can also be a button, a mouse, or other one-dimensional Alternatively, two-dimensional input means can be used.

(Effects of the Invention) As is clear from the above description, according to the present invention, in a large projection screen using an image projection means that projects images such as characters and figures onto the screen surface, pointing marks are projected onto the screen surface. This has the effect that the projection position can be fixedly displayed at a designated point on the screen, regardless of the movement of the hand of the person performing the operation, such as a lecturer.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram for explaining an embodiment in which the present invention is applied to a sliding projection screen display device, and FIG. 2 is a schematic diagram of an example of a conventional projection screen display device. . DESCRIPTION OF SYMBOLS 1... Light source, 2... Projection original image, 3, 4... Projection optical system, 5... Half mirror 16... Receiving/control system,
7... Receiving antenna, 8... Pointing mark projector using small laser, 9... Rotating mirror 10
...Positioning device, 11...Transmission antenna.

Claims (1)

[Claims] an image projection means for projecting images such as characters and figures onto a screen surface; a pointing mark projection means for projecting a pointing mark onto the screen surface; a projection position control means for controlling a projection position of the pointing mark projection means; 1. An in-screen instruction device for a large projection screen, characterized by comprising a transmitting means for sending a control signal to a projection position controlling means.