KR920004278Y1 - Presentation device used in combination with an overhead projector - Google Patents

Abstract

No content.

Description

Display unit coupled to overhead projector

1 is a perspective view illustrating a display device according to an exemplary embodiment of the present invention with a panel unit separated from a case.

2 is an enlarged cross-sectional view showing a movable leg of the panel unit.

3 is a schematic view showing part of a case side edge.

4 is a sectional view taken along line IV-IV of FIG.

* Explanation of symbols for main parts of the drawings

10 panel unit 12 case

14 frame 20 surrounding wall

22 liquid crystal panel 24 request portion

26: removable leg 28: pin

30: ring-shaped protrusion 32: spring

34: arm 40: lower surface

42: fixed leg 44: circuit housing

46 connection part 56 handle

The present invention relates to a display device combined with an overhead projector for projecting an image on a screen, and in particular, located on the stage of an overhead projector as an alternative means of copying data, such as manuscripts, graphs, etc. It relates to a display device.

Overhead projectors are used to project magnified images of data copies onto screens in places where many people, such as conferences, lectures, seminars, etc., are crowded. Each projector is provided with a transparent stage with a copy of data, a light source housed in the body of the projector and an enlarged reflector disposed on the stage outside the body of the projector. The light source penetrates the stage to emit light. The reflector is used to reflect light transmitted through the stage or data copy towards the screen.

In the overhead projector described above, the data copy on the stage must be formed of a transparent film containing information to be projected according to the projection principle on the screen. Therefore, when projecting an image by an overhead projector, it takes much time to prepare a data copy in advance. In addition, when the number of copies used for projection increases, it takes a lot of time and effort to replace data copies on the stage.

In view of such various situations, a panel unit having a transmissive liquid crystal panel has been invented in place of a data copy formed of a transparent film. The panel unit, i.e., the liquid crystal panel, is connected to a so-called personal computer, in particular a portable personal computer, for use as a display device of a computer. Therefore, the panel of the panel unit can receive the video signal from the personal computer and display the video according to the signal.

In operation, the panel unit is located on the stage of the overhead projector. However, the liquid crystal panel of the panel unit tends to be adversely affected by heat emitted from the light source in the projector. Therefore, during the use of the panel unit, a method of attaching a leg on the lower side of the panel unit has been proposed so that a predetermined distance gap is provided between the panel unit and the stage of the projector. However, when the legs are provided in the panel unit, the size or thickness of the legs has a certain size, and in addition, a problem arises in that the volume of the case for protecting the panel unit or the liquid crystal panel increases.

Therefore, the size of the entire display device composed of the panel unit and the case becomes excessively large, making it difficult to carry.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device for use in an overhead projector having a structure in which the panel unit is kept small in size, i.e., in thickness, even though a leg is attached to the panel unit.

The above object is achieved by a display apparatus for an overhead projector according to the present invention, which is a transmissive liquid crystal panel capable of displaying information including a frame, a character and an image to be projected while being mounted in the frame, the frame At least one requesting portion located on an outer surface of the projecting portion, protruding from the requesting portion when fully rotated in the requesting portion and rotated in another direction, when rotated in one direction with a proximal end rotatably mounted within the requesting portion by a pin. A movable leg used to have a distal end portion, a pressing means for pressing the movable leg to rotate in the other direction, and disposed in the request portion and the movable leg being pressed to rotate in the other direction by the pressing means. Stopper used to restrict the movable leg from rotating in the other direction A panel unit including a means, and a case capable of storing the panel unit therein, the case having an open edge providing an inlet opening through which the panel unit is inserted and inserted into the case; Acts as an actuating part used to engage and rotates the movable leg in the one direction against the pressing force of the pressing means such that the direction perpendicular to the axial direction of the pin when the panel unit is inserted into the case through the inlet opening To allow the movable leg to be housed within the request.

According to the above apparatus, when the panel unit is withdrawn from the case, the movable leg of the panel unit protrudes from the request portion by the pressing force of the pressing means. Therefore, in use, the panel unit can be positioned on the stage of the overhead projector with the aid of a movable leg. In this case, a gap of a predetermined distance along the height of the movable leg is provided between the panel unit and the stage. Therefore, the liquid crystal panel of the panel unit is not adversely affected by the heat from the projector.

As the panel unit is inserted into the case through the inlet opening, the movable leg protruding from the panel unit is housed in the request portion. Therefore, despite the presence of the movable legs, the case is sized to house only the panel unit, and the entire display device is kept compact while the panel unit is housed in the case.

Also, when the panel unit is housed in the case, the movable leg of the panel unit is automatically inserted into the request by the open edge of the case.

Therefore, no separate actuating part is required for the movable leg to be housed in the demanding part.

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

The display device shown in FIG. 1 is used in combination with an overhead projector.

The display device is composed of a panel unit 10 and a case 12. The unit 10 comprises a rectangular plastic frame 14, the plastic frame 14 having an upper frame surface 16, a lower frame surface 18, and a peripheral wall surface connecting the surfaces 16 and 18. 20).

The transmissive liquid crystal panel 22 is mounted in the frame 14. Since such panels are conventional, the details are weak in the present invention. The pair of request portions 24 are individually formed at two corner portions on one short side side of the frame lower frame surface 18. Each requesting portion 24 is in the form of a groove extending along the corresponding long side of the frame 14.

As shown in FIG. 2, the proximal end of the plastic movable leg 26 is rotatably mounted in each request portion 24 by a pin 28. As shown in FIG. In particular, the proximal end of the leg 26 is disposed in the request portion 24 on one short side side of the panel unit 14. The pin 28 extends across the grooved demands so that the opposite ends of the pin 28 are supported on corresponding inner walls facing each other. The proximal end of the leg 26 is rounded. The legs 26 also have a length that can be fully housed in the request 24 when rotated in one direction about the pin 28 as shown by the dashed line in FIG.

A ring-shaped protrusion 30 which is coaxial with the pin 28 is formed on the side of the movable leg 26 opposite to the side shown in FIG. The coil portion of the torsion coil spring 32 is mounted on the protrusion 30. The spring 32 has a pair of arms 34 and 36. The tip of the arm 34 is fixed to the open edge of the requester 24 and the tip of the arm 36 is fixed to the leg 26 by passing through a hole in the distal end of the leg. The spring 32 pushes the movable leg 26 in the other direction, ie counterclockwise in FIG. Therefore, the leg 26 is compressed against the inner wall 38 of the request portion 24 by the pressing force of the spring 32. The wall 38 is inclined to make surface contact with the side edge of the leg 26. As shown in FIG. 2, when the legs 26 engage the inner wall 38, the lower end surface 40 of the legs is parallel to the surface of the liquid crystal panel 22 of the panel unit 10. As shown in FIG.

In the above embodiment, each requesting portion 24 is provided by a plastic member 42 in the form of a bathtub. However, optionally, each requesting portion 24 may be provided by the frame 14 itself without using the member 42.

The pair of stationary legs 42 are individually attached to two corner portions on the side of the other short side of the lower frame surface 18 of the panel unit 10. Each stationary leg 42 is formed of a cylindrical member made of rubber. The height of each stationary leg 42 from the face 18 is equal to the height of each movable leg 26 in the protruding state shown in FIG.

The circuit housing 44 is provided integrally with the frame 14 and adjoins the other short side of the panel unit 10. The circuit housing 44 is rectangular and extends along the other short side of the unit 10. The interior of the housing 44 communicates with the interior of the panel unit. The housing 44 includes a driving circuit for driving the liquid crystal panel 22. The drive circuit is electrically connected to a connection 46 provided on the side of the housing 44. Therefore, the driving circuit can receive the information signals to be displayed on the panel 22 from the computer, for example, the personal computer, through the connecting portion 46.

As can be seen from FIG. 1, the circuit housing 44 includes the upper and lower frame surfaces 16 and 18 and the peripheral wall surface 20 of the panel unit 10 at the boundary between the housing 44 and the unit 10. Protrude from the predetermined distance. However, the protruding distance or height of the housing 44 from the lower frame surface 18 of the unit 10 is somewhat shorter than the height of each stationary leg 42.

The case 12 used for storing the panel unit 10 therein is a plastic case slightly larger than the frame 14 of the unit 10. A rectangular retracting opening 48 for the panel unit is formed in the end face on one short side of the case. The pair of guide tapes 50 pass through each of the pair of inner surfaces of the case 12 extending parallel to the liquid crystal panel 22 of the panel unit 10, as shown in FIG. Only the guide tapes on the inner surface of the case 12 are shown in FIG. Tapes 50 formed of synthetic resin, such as polyethylene, extend from the inlet opening 48 along the long sides of the case 12.

The guide tape 50 has a thickness suitable for sliding contact with the corresponding frame surfaces 16 and 18 of the panel unit 10 when the unit 10 is inserted into the case 12 through the inlet opening 48. Have

A pair of notches 54 are formed on the open edge 52 of the case 12 which provides an inlet opening 48 at the edge which is continuous with the inner surface of the bottom of the case.

Each notch 54 is arranged to correspond to the corresponding stationary leg 42 of the panel unit 10, and is sized to accommodate the stationary leg 42 when the unit 10 is housed into the case 12. Have

In addition, the case 12 is fixed with a handle 56 to facilitate carrying of the display device. The handle 56 includes a pair of arms 58 and a gripping bar 60 connecting the respective distal ends of the arms 58.

The proximal end of each arm 58 is rotatably mounted on the corresponding long side edge of the case 12.

In addition, as shown in FIG. 3, an elastically deformable tongue 62 is individually formed on the long side edges of the case by partially cutting the sidewalls of the case. . Each tongue 62 is used to engage the corresponding claws 64 on the peripheral wall surface 20 of the panel unit 10 when the unit 10 is housed in the case 12. As shown in FIG. 4, a triangular protrusion 66 used to cooperate with the hook 64 is formed on the inner surface of the tongue 62. Therefore, as the panel unit 10 is inserted into the case 12, each hook 64 of the unit 10 passes over the protrusion 66 of the corresponding tongue 62 so that the tongue is elastically deformed. This engages with the rear side of the projection 66. When the panel unit 10 is removed from the case 12, the unit 10 is drawn out by a predetermined force so that the protrusion 66 of the tongue 62 is moved by the elastic deformation of the tongue 62. It is separated from the hook 64. Therefore, the panel unit 10 is taken out from the case.

In the foregoing display apparatus, when the panel unit 10 is not in the case 12 as shown in FIG. 1, the movable legs 26 of the unit 10 are requested by the torsion coil springs 32 to respond. It is pressed to protrude outward from the parts 24. Therefore, when the panel unit 10 is located on the stage of the overhead projector, a gap of a predetermined distance depending on the height of the movable and fixed legs 26 and 42 is the liquid crystal panel 22 of the stage and the unit 10. ) Is prepared between. Therefore, during the use of the panel unit 10, the panel 22 is not adversely affected by the heat from inside the projector.

When the panel unit 10 is not used, the case is inserted through the inlet opening 48 into the case 12 so that the movable leg 26 of the panel unit rotates against the pressing force of the torsion coil spring 32. It is engaged with the open edge 52 of. Thereby, the legs 26 are housed in the corresponding requesting portions 24 as shown by the dashed line in FIG.

When the panel unit 10 is completely housed in the case 12, the open edge 52 of the case is engaged with the raised surface between the unit 10 and the circuit housing 44. Therefore, each outer surface of the housing 44 and the case 12 is aligned with each other continuously and the fixed legs 42 of the unit 10 are received by corresponding notches 54 of the case.

It is to be understood that various changes and modifications can be effectively carried out by those skilled in the art without departing from the scope or spirit of the invention, as the invention is not limited to the embodiments described above.

For example, the number of movable legs 26 need not always be two, and only one movable leg may be used. In this case, however, a single movable leg should preferably be placed at the midpoint of the paired movable legs 26 of FIG. In contrast, movable legs similar to the movable legs 26 can be used in the position of the stationary legs 42. In this case, the notch 54 of the case 12 is omitted.

Claims (8)

A panel unit 10 including a frame 14 and a transmissive liquid crystal panel 22 capable of displaying information including a character and an image to be projected while being mounted in the frame 14, and the panel unit 10 therein. In the display device for an overhead projector composed of a case (12) for storing in the case, the panel unit (10) is connected to the frame (14) by one or more requesting portions (24) and pins (28). A movable leg 26 having a proximal end which is rotatably mounted in the requesting part 24 and which is completely housed in the requesting part when rotated in one direction and protruding from the requesting part 24 when rotated in another direction. Pressing means for pressing the movable leg 26 to rotate in the other direction, and when the movable leg 26 is pressed to rotate in the other direction by the pressing means while being disposed in the request portion. It also includes a stopper means used to limit the rotation of the leg 26 in the other direction, wherein the case 12 has an inlet opening through which the panel unit 10 is inserted through the case 12. An open edge 52 providing 48, the open edge 52 acting as an actuating portion engaging with the movable leg 26 to move against the pressing force of the pressing means 26; Is rotated in one direction so that when the panel unit 10 is inserted into the case 12 through the inlet opening 48, the movable leg 26 moves in the direction perpendicular to the axial direction of the pin 28. 24) A display device for an overhead projector, characterized in that it is housed within. The panel unit (10) of claim 1, wherein the frame (14) of the panel unit (10) has a rectangular structure having four corner portions, and the request unit (24) having a movable leg (26) housed therein is a panel unit. And a pair of corner portions on the side of the frame (14) first introduced into the case (12) when the (10) is inserted into the case (12). A pair of stationary legs (42) is individually disposed at corner portions on the other side of the frame (14), and the open edge (52) of the case (12) is provided with a panel unit (3). A display device, characterized in that notches (54) are provided which are used to receive the corresponding stationary legs (42) when 10) is housed in the case (12). 4. The opening opening 48 of the case 12 according to claim 3, wherein the circuit housing 44 including the driving circuit for driving the liquid crystal panel 22 is provided when the panel unit 10 is housed in the case 12. And the circuit housing (44) protruding from the case so as to be integrally formed on the end face of the panel unit (10) exposed from the casing. 5. The surface of claim 4, wherein an elevated surface is formed at a boundary between the circuit housing 44 and the panel unit 10 to surround the panel unit 10, wherein the elevated surface is provided with the panel unit 10 in the case 12. It is characterized in that the outer edges of the circuit housing 44 and the case 12, when housed, are sized so that their heights are aligned and continuous with each other so that the open edges 52 of the case 12 come into contact with the rising surface. Display. 2. A coil according to claim 1, wherein the pressing means is individually attached to the coil portion attached to the movable leg 26 and to the open edge of the movable leg 26 and the requester 24 such that the pressing means is coaxial with the pin 28. And a torsion coil spring (32) having a pair of arm portions (34, 36). 7. Display device according to claim 6, characterized in that the stopper means comprises an inner wall (38) of the requesting portion (24). 8. The inner wall (38) of the claim portion (24) according to claim 7, wherein the movable leg (26) contacts the inner wall (38) of the request portion (24) by the pressing force of the torsion coil spring (32). And a planar contact with the display device.