KR100725490B1 - A projection apparatus - Google Patents

Abstract

Projection apparatus according to the present invention, the light source for generating light; An image generator which generates a predetermined image using light; A projection lens system for projecting the image light; And a cover unit which blocks light leaking to the outside of the projection lens system in multiple stages. According to this, leakage of light through the projection lens system is blocked, and the quality of the image quality projected on the projection surface is improved.

Optics, projection, blocking, cover, light, leak, shielding, sealing, sealing, refraction.

Description

Projection device {A PROJECTION APPARATUS}

1 is a perspective view schematically showing a projection apparatus according to the present invention, and

2 is a perspective view schematically showing the installation relationship of the second cover member shown in FIG.

<Description of the reference numerals for the main parts of the drawings>

10: light source 20: image generating unit

30: projection lens system 31: projection lens

40: cover unit 41: first cover member

42: second cover member

The present invention relates to a projection apparatus for projecting light and an image onto a projection surface to implement a large image.

A general projection apparatus is a device that realizes a large image by enlarging an image with light and projecting it on a projection surface such as a screen, such as a projection television or a projector.

The projection apparatus is classified into a cathode ray tube (CRT), a liquid crystal display (LCD), and a digital light processing (DLP) projection apparatus according to the type of the image generating unit employed.

Here, the DLP projection apparatus operates as a mechanism of enlarging and projecting an image signal received from the outside using a digital micro-mirror device (DMD) semiconductor chip in which hundreds of thousands of micromirrors are integrated.

The DLP projection apparatus includes a light source for generating light, an image generation unit employing DMD, and a projection lens system for guiding a path of light and an image.

Here, the light generated from the light source is image modulated by illuminating the DMD generating the image of the image generating unit. The projection lens system includes a plurality of lenses to enlarge and project the image light modulated into an image onto a projection surface.

However, when the light guided by the projection lens system passes through the interior of the projection lens system, a problem of leaking to the outside through a gap of the projection lens system is caused. In particular, since the light is refracted by the refractive surface of the lens for projecting light onto the projection surface and leaks into the non-projection area, the image quality formed on the projection surface is deteriorated. Therefore, a countermeasure that can block light leaking outside the projection lens system is required.

The present invention has been made in view of the above, and an object thereof is to provide a projection device that can improve image quality by blocking light leaking outside the projection lens system.

Projection apparatus according to the present invention for achieving the above object, a light source for generating light; An image generator which generates a predetermined image using the light; A projection lens system for projecting the image light; And a cover unit which blocks light leaking to the outside of the projection lens system in multiple stages.

According to a preferred embodiment of the present invention, the projection lens system preferably includes a projection lens installed to be exposed to the outside.

The cover unit may include a first cover member covering an upper portion of the projection lens system except for the projection lens; And a second cover member installed on the first cover member to cover the vicinity of the projection lens.

The second cover member may be provided in a non-projection area of light projected through the projection lens.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the projection apparatus according to an embodiment of the present invention includes a light source 10, an image generator 20, a projection lens system 30, and a cover unit 40.

The light source 10 emits a predetermined light and is installed at one side of the image generating unit 20. The light emitted from the light source 10 is guided to the image generating unit 20 by a light path switching unit not shown. Here, a general lamp such as a halogen lamp may be used as the light source 10.

The image generating unit 20 forms a predetermined image and employs a DMD for generating an image by turning on / off a plurality of micromirrors driven independently for each pixel. Here, the image generated by the image generator 20 is illuminated by light and modulated into an image. Since the image generating unit 20 employing such a DMD can be understood from a known technique, a detailed description thereof will be omitted.

The projection lens system 30 projects the image-modulated image light on a projection surface such as a screen, and is installed on the front of the image generator 20. Here, the projection lens system 30 includes a projection lens 31 installed to be exposed to the outside to project the image light to the projection surface.

Since the technical configuration of such a projection lens system 30 can be understood from a known technique, a detailed description thereof will be omitted.

The cover unit 40 blocks the path of light leaking from the projection lens system 30 to an external region other than the projection surface in multiple stages, and includes the first and second cover members 41 and 42. .

The first cover member 41 is installed to cover the upper portion of the projection lens system 30. In this case, the first cover member 41 covers the upper portion of the projection lens system 30 except for the projection lens 31 exposed to the outside.

The second cover member 42 is provided in a non-projection area of light projected through the projection lens 31 on one side of the first cover member 41. Specifically, the second cover member 42 is installed at a position capable of blocking light other than the light projected through the projection lens 31. This is because the second cover member 42 is blocked by the lens refracting surface of the projection lens 31 to block the leaked light.

As shown in FIG. 2, the second cover member 42 includes a first cover member 41 by a guide protrusion 41a and a fastening boss 41b provided at one side of the first cover member 41. Is fixed to.

Here, the guide protrusion 41a guides the installation position of the second cover member 42, and the fastening boss 41b is fastened with a screw S for fixing the second cover member 42. At this time, the second cover member 42 is formed with a locking groove 42a for locking the second cover member 42 to the edge 31a of the projection lens 31.

Meanwhile, in the present exemplary embodiment, the second cover member 42 covers the vicinity of the upper portion of the projection lens 31, but the present invention is not limited thereto. That is, as the second cover member 42 is installed on the first cover member 41 so as to surround the entire edge 31a of the projection lens 31, the second cover member 42 may cover the light leaking into the non-projection area. Of course, any position can be installed.

A projection apparatus having the above configuration will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the light generated by the light source 10 is image-modulated by illuminating the image generated by the image generator 20 and is incident to the projection lens system 30. Thereafter, the image light incident on the projection lens system 30 is enlarged and projected onto the projection surface through the projection lens 31.

At this time, the first cover member 41 primarily blocks light leaking to the outside through the gap while passing through the projection lens system 30. Thereafter, the second cover member 42 secondly blocks light leakage near the projection lens 31. As a result, light leaking to the outside is effectively blocked by the projection lens 31.

According to the present invention as described above, the light passing through the projection lens system is blocked by the cover unit, thereby improving the efficiency of the light projected through the projection lens system. In particular, since light leakage in the vicinity of the projection lens for projecting light onto the projection surface is blocked in multiple stages, the image quality projected onto the projection surface can be improved.

While the invention has been shown and described in connection with the preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (4)

A light source for generating light; An image generator which generates a predetermined image using the light; A projection lens system for projecting the image light onto a projection surface; And And a cover unit which blocks a path of light leaking from the projection lens system to an external region other than the projection surface in multiple stages. The method of claim 1, The projection lens system includes a projection lens installed to be exposed to the outside. The method of claim 2, wherein the cover unit, A first cover member covering an upper portion of the projection lens system except for the projection lens; And And a second cover member installed on the first cover member to cover the vicinity of the projection lens. The method of claim 3, wherein And the second cover member is installed in a non-projection area of light projected through the projection lens.

Images