KR20090013909A - Line type beam projector - Google Patents

Abstract

A line type beam projector is provided to minimize a surrounding environment restriction due to a projection distance and an image-covering effect due to a man and an object by excluding a regular projection interval required to an existing beam projector. A square image of an X a size outputted from an image output part(B) as a ling type beam projector passes through a Fresnel lens(9) for collecting light. The square image is reflected on a plane total-reflecting mirror(10) and a curved total-reflecting mirror(4). The image reflected by the curved total-reflecting mirror is outputted by a curved total-reflecting mirror(3). The image enlarged by the curved total-reflecting mirror is outputted into a Fresnel lens(2). The enlarged image is changed to the parallel image by using the Fresnel lens. The parallel image passes through a custom-made Fresnel lens(1). The final image is displayed on a screen.

Description

 Line Type Beam Projector {Line Type Beam projector}

  It is no exaggeration to say that the beam projector technology occupies almost the entire field of image output technology. In order to project high quality images on the screen, the image output of the beam projector must also be high quality. Image output technologies of conventional beam projectors include liquid crystal display (LCD) and digital lighting processing (DLP).

 Since such image output technology has advantages and disadvantages, it is possible to adopt an image output technology that satisfies the requirements of consumers in the line type beam projector of the present invention, which is flexible and its application field is wide.

 The present invention allows the image output by the conventional LCD, DLP method to be projected on the screen without being limited by the projection distance between the beam projector and the screen, and to make the beam projector shape linearly long and small in volume.

 To this end, the present invention has been made in the background of a technology of increasing an image of a conventional projection television and projecting it on a screen.

As shown in FIGS. 1 and 2, a conventional beam projector must have a constant projection distance in order to project an image of an appropriate size on the screen. The environmental constraints are big. That is, a space in which the beam projector can be used must be prepared separately.

When installing a conventional portable beam projector, a white wall surface is required to carry a portable screen separately or to project an image, and environmental constraints that require a constant projection distance are followed, so that the actual use place is limited. P.

Since the projection distance of the conventional beam projector is long, the image (light) is exposed to the air and tends to be lost. Therefore, a lamp that consumes high power is used and its lifetime is also short, which requires high maintenance costs.

As the DMB (Digital Multimedia Broadcasting) and PMP [portable multimedia player] technologies are developed, LCD and PDP are gaining attention as a display device that can play them and show them to consumers. Because it can be made thinner, there is a limit to reducing image inches, that is, miniaturization.

  The present invention solves the problem of the conventional beam projector raised above using a planar total reflection mirror, a curved total reflection mirror, and a custom-made Fresnel lens.

   Since there is virtually no constant projection distance required by the conventional beam projector, the limitation of the surrounding environment due to the projection distance and the image obscuration caused by people and objects hardly occur. For example, a venture company with limited space does not need to install a separate beam projector and operate it in a narrow space. When a professor lectures in the lecture room where the present invention is installed, the lecturer can approach the front of the screen and point to an important part by hand, so that the lecture can be improved by only looking at the screen, thereby improving low class concentration.

 Since the projection distance of the conventional beam projector is long, the image (light) tends to be lost due to being exposed to the air, but the present invention uses a lamp that consumes high power by significantly reducing the projection distance exposed to the air. There is no need to shine the brightness. Thus, the choice of alternative lamps is wider, and the maintenance cost is reduced because its power consumption and lifespan can also be extended.

  Existing video display devices, such as LCD and PDP, can be made thin, but reducing the screen width will provide a small screen to consumers. The present invention has made the form as shown in Figure 8 to overcome this limitation. The line-type beam projector is made in the form of a pen by minimizing the diameter of the base and increasing its height to improve portability and to display a large screen. See FIG. 8.

 Detailed description for carrying out this invention will be described below.

  The present invention relates to a line type beam projector. 1 is a plan view briefly illustrating an internal structure of a conventional beam projector and a path of an image (light). B 'is a part that outputs an image using an LCD panel, and FIG. 5 illustrates a structure using the conventional LCD method. A 'briefly illustrates a path through which the output image (light) reaches the screen, and is the focus of the present invention. 2 briefly illustrates a relationship between a focal length and a projection distance in a conventional beam projector. Conventional beam projectors show that a certain throw distance is required to ensure that the output image is lit on the screen. The present invention devised the line type beam projector of the outline shown in FIG. 3 to achieve the above-mentioned effect as well as to eliminate the need for such a constant throw distance. 4 is a side view briefly showing the outline of the line type beam projector of the present invention, which is directly adjacent to the top of the screen, unlike a conventional beam projector having a constant projection distance from the screen.

 5 is a front view briefly showing the internal structure of the line type beam projector and the path of an image (light) using the LCD method. It will be described with reference to Figure 5 well showing the core of the present invention. B is an image output part. In the figure, the LCD method is shown as an example, but instead of this method, the DLP method may be used to output an image. The square image of the a X a size output by the LCD or the DLP method is reflected by the planar total reflector 10 through the Fresnel lens 9 for collecting light, and is directed to the curved total reflector '(4). The image reflected by the curved total reflection mirror 4 is reflected on the curved total reflection mirror 3 of the type shown in FIG. 7. The image stretched by the curved total reflection mirror 3 is incident on the Fresnel lens 2 in the form of a x xa rectangular shape in which one side is extended by x times. The images (light) paralleled to each other while passing through the Fresnel lens 2 are passed through the adjacent custom-made Fresnel lens 1 to be finally reflected on the screen. At this time, the custom made Fresnel lens is a Fresnel lens (1) that is custom made to be projected on the screen as a square image of xa X xa size by increasing the length of a length of the incident a X xa size rectangular image x times.

   Referring to FIG. 6, it is possible to grasp the size and shape of an image output panel, a curved total reflection mirror, and an image projected on a screen, which constitute the line type beam projector of the present invention. (A) is an image of the image output part, and a square shape of a X a, (b) is an image in which the image reflected on the curved total reflection mirror 3 of FIG. 7 (d) is incident on the Fresnel lens 2, and a In the X a image, only one side is x times the rectangular shape of size a x xa, and (C) is the final image projected on the screen, which is the square shape of xa X xa.

 8 is a perspective view briefly illustrating a mini line beam projector manufactured by miniaturizing the line type beam projector according to the present invention. The mini-line beam projector made by miniaturizing the structure of FIG. 5 has a small LCD or DLP type video output device at a B "part, and a 15 part can be rolled up and accommodated. An external data input device 12 and It is a display-only device that is portable by allowing an external power supply device 14 to be connected and used.

  Although the present invention has been described with reference to the examples shown in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

1 is a plan view briefly illustrating an internal structure of a conventional beam projector and a path of an image (light).

2 briefly illustrates a relationship between a focal length and a projection distance in a conventional beam projector.

It was.

Figure 3 is a perspective view briefly showing the outline of the line-type beam projector of the present invention. 4 is a simplified illustration of the line type beam projector outline of the present invention.

Side view.

5 is an internal structure of a line type beam projector adopting the LCD method of the present invention;

It is a front view which shows the path of an image (light) briefly.

Figure 6 is a video output panel and curved surface constituting the line-type beam projector of the present invention

Total mirror, briefly shows the size and shape of the image projected on the screen.

Figure 7 is a simplified overview of the curved total mirror installed in the line-type beam projector of the present invention

As shown, (d) is a plan view, (e) is a front view, and (bar) is a perspective view.

8 is a portable miniaturized line-type beam projector of the present invention

A simplified perspective view of a mini line type beam projector.

1: Custom Made Fresnel Lens

2: Fresnel lens

3: total surface mirror

4: total surface mirror '

9: pronel lens

10: flat total mirror

11: screen

12: external data input device

13: screen can be stored in the body

14 external power supply

15: main body with a screen storage space

16: 500 won coin; Also shown for size comparison with a mini-line type beam projector.

# Part B of the LCD or DLP method of FIG. 5 outputs an image, and specific names thereof are omitted in the present invention.

Claims (7)

 As a line type beam projector, the square image of size a X a output from the image output portion (B) is reflected by the planar total reflection mirror (10) through the Fresnel lens (9) that collects the light, and the curved total reflection mirror (4). Headed for. The image reflected by the surface total reflection mirror (4) is reflected in the surface total reflection mirror (3). The image extended by the curved total reflection mirror 3 enters the Fresnel lens 2, and the image (light) paralleled to each other through the Fresnel lens 2 passes the adjacent custom-made Fresnel lens 1 A line-type beam projector characterized in that the light is finally projected on the screen by passing through. The method according to claim 1, Line type beam projector, characterized in that the existing beam projector is directly in contact with the top of the screen, unlike the distance away from the screen with a constant projection distance. The method according to claim 1, The line type beam projector characterized in that the image extended by the curved total reflection mirror (3) is incident on the Fresnel lens (2) in the form of a x xa rectangular shape in which only one side of the a x a image is extended by x times. . The method according to claim 1, The custom made Fresnel lens (1) is a line type beam characterized by being made to be projected on the screen as a square image of xa X xa size by increasing the length of a length of the incident a X xa size rectangular image x times. Projector. The method according to claim 1, The mini-line beam projector made by miniaturizing the overall line-type beam projector structure includes a miniaturized image output device, which can be rolled up to receive the screen 13, and an external data input device 12 and an external power supply device 14. Line type beam projector for easy portability. The method according to claim 5, The screen 13 that can be accommodated in the mini line beam projector can be stored in a curled state on the main body 15, and when the screen is stored, the screen 13 is folded, and when the screen is unfolded, the screen 13 is unfolded so that the screen is flat. Mini line beam projector with support for maintenance. The method according to claim 1, The screen can be stored in a curled form on a line-type beam projector body, and the back portion of the screen includes a support that is folded when the screen is stored and spreads when the screen is unfolded so that the screen can remain flat. Type beam projector.

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