JPS62249180A - Projector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to an apparatus for enlarging and projecting the image of an object.

[Prior art and its problems]

Conventionally known projection devices of this type include those that project characters and figures drawn on transparent film (projectors, etc.), and those that project television images based on video signals. Are known. However, the former type of projection device has the disadvantage that it cannot project images drawn on opaque materials or the object itself, while the latter type of projection device is large in size because it projects images displayed on a cathode ray tube using video signals. It had the disadvantage of being both formal and complex.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a projection device that is capable of projecting a drawing on an opaque material or an object itself, and has a simple structure consisting of a light source and a shield.

[Key points of the invention]

The gist of the present invention is to convert an image signal obtained by capturing an image of an object using an input device into a dot signal, and to project a shielding object whose transparency changes according to the dot signal using a light source and a screen. This is to project an image of an object.

[Embodiments of the invention]

FIG. 1 is a block diagram showing an embodiment of a projection apparatus according to the present invention. In the figure, 1 is an input device such as a television camera incorporating a solid-state image sensor, 2 is a signal converter that receives an image signal from input device 1 and generates a corresponding dot signal, and 3 corresponds to the dot signal. 4 is a light source, 5 is a screen, and 6 is an object. The dot/dot signal output from the signal converter 2 represents the image of the object as a set of points; for example, it is "1" if the image signal for the object 6 has a brightness above a certain level, otherwise it is "1". In this case, it is converted as "O#." The shielding object 3 is composed of, for example, an aggregate of minute liquid crystals, and each liquid crystal has a transparency that changes depending on the dot signal output from the signal converter 2. In such a configuration, when an image of the object 6 is captured by the input device 1, the image signal is sent to the signal converter 2 and converted into a dot signal. By changing the transparency of the shielding object 3, the transparency of the shielding object 3 as a whole changes in accordance with the appearance of the object 6.Therefore, this shielding object 3 is illuminated by the light source 4 placed in front of it to illuminate the screen 5. By projecting the shield 3, an image corresponding to the appearance of the object is projected onto the screen 5.

【Effect of the invention】

According to the present invention, the image signal of the object is converted into a dot signal, and the transparency of the shielding object placed in front of the light source is changed using the dot signal to project the object's appearance. The device can also project images drawn on the screen, and has a simpler structure than a conventional device that projects images displayed on a cathode ray tube using video signals.

[Brief explanation of drawings]

FIG. 1 shows a block diagram of an embodiment of a projection apparatus according to the present invention.

Claims (1)

[Claims] 1) An input device that inputs the appearance of an object and generates an image signal, a signal converter that generates a dot signal corresponding to the image signal, a shield whose transparency changes according to the dot signal, and the shield A projection device comprising: a light source placed on one side of an object; and a screen placed on the other side of the shielding object to project an image of the shielding object produced by the light source.