JPH06138544A - Carrying case shaped compact screen and compact screen - Google Patents

Abstract

PURPOSE:To provide a compact screen capable of obtaining a large projection screen (rear screen) while maintaining its portability. CONSTITUTION:The compact screen 20 is constituted of a mirror 20A, a transmission type screen 20B, a shielding plate 20C provided with an incident window 21 and a shielding plate 20D; each of them is connected with the others so that they can be folded. The compact screen 20 is folded and stored in a carrying case when it is not in use, and it is assembled so that the circumference may become trapezoidal in the lower case 10A of the carrying case when it is in use, and a projected image through the incident window 21 is reflected on the mirror 20A by an almost right angle so as to be guided to the transmission type screen 20B, and then, the projected image is projected on the transmission type screen 20B. The compact screen 20 is assembled separately from a liquid crystal projector 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrying case type small screen and a small screen, and more particularly to a small screen which can be housed simultaneously in a carrying case which houses a device for projecting an image such as a liquid crystal projector or a slide projector.

[0002]

2. Description of the Related Art Some conventional small screens are composed of a transmissive screen and a mirror which are arranged in a door-like manner on a liquid crystal projector body so as to be opened and closed (Japanese Patent Laid-Open No. 63-196192). ). This small screen
When using it, stand the screen and mirror, reflect the image projected from the projection lens with the mirror and guide it to the screen,
The projected image is displayed on the screen.

Further, there is one in which one surface of a carrying case of a video camera is used as a transmissive small screen (Japanese Utility Model Laid-Open No. 3-115474). A projection image is projected on the small screen directly from the inside of the carrying case or via a mirror.

[0004]

However, in the former small screen, the distance from the projection lens cannot be increased and the screen on the screen cannot be increased. When enlarging the screen, the device itself becomes large and the portability deteriorates. Further, since the screen and the mirror are opened like a door with respect to the liquid crystal projector main body, external light is likely to enter from the surroundings, and there is a problem that sufficient contrast cannot be obtained during use in the daytime.

On the other hand, in the latter small screen, since the darkness is maintained inside the carrying case, a sufficient contrast can be obtained in the projected image, but since it is enlarged and projected only inside the carrying case, the same as the former case. There is a problem that the screen cannot be enlarged. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a carrying case type small screen and a small screen capable of realizing a large-sized projection (rear screen) screen while ensuring portability. To aim.

[0006]

In order to achieve the above-mentioned object, the present invention comprises a box-shaped carrying case for accommodating a device for projecting an image, and a small screen folded and accommodated in the carrying case. A carrying case type small screen comprising:
Each of the mirrors comprises a foldable connected mirror, a transmissive screen, a first shield plate having an entrance window, and a second shield plate, and the surrounding shape of the carrying case is trapezoidal using the carrying case. The assembled small screen described above, the projected image incident from the entrance window of the first shielding plate is reflected by the mirror at a substantially right angle, is guided to the transmissive screen, and is projected on the transmissive screen. Characterized by displaying an image.

[0007] A side wall composed of a mirror, a transmissive screen, a first shield plate having an entrance window, and a second shield plate, and a third shield plate serving as an upper lid are connected so that they can be folded. A small screen, wherein the small screen is assembled so that its peripheral shape is trapezoidal, and the assembled small screen has a projection image incident from an entrance window of the first shielding plate. It is characterized in that it is reflected at a substantially right angle by a mirror and guided to the transmissive screen, and a projected image is projected on the transmissive screen.

[0008]

According to the present invention, the small screen is composed of a foldable mirror, a transmissive screen, a first shield plate having an entrance window, and a second shield plate. This small screen is stored in a box-shaped carrying case that stores a device that is folded and projects an image when not in use, and is assembled so that its surrounding shape becomes a trapezoid in the carrying case when used. The projection image incident from the entrance window of the first shield plate is reflected at a substantially right angle by the mirror to be guided to the transmission screen, and the projection image is projected on the transmission screen. That is, since this small screen is assembled separately from the device that projects the image, it can be installed at a position away from the device, and thus a sufficient enlarged projection distance can be secured. In addition, external light also enters through the entrance window of the first shield plate, but since the entrance window itself is relatively small,
The internal darkness is maintained, and the image quality on the screen can be kept good even during the day.

According to another aspect of the present invention, without using the carrying case, the small screen includes a mirror, a transmissive screen, a first shield plate having an entrance window, and a first shield plate, which are foldably connected to each other. It is composed of a side wall composed of two shielding plates and a third shielding plate serving as an upper lid. This small screen is assembled so that the peripheral shape becomes a trapezoid when used, and the projected image incident from the entrance window of the first shielding plate is reflected by the mirror at a substantially right angle to guide it to the transmissive screen. The projected image is displayed on the transmissive screen.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a carrying case type small screen and a small screen according to the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3, 10A is a lower case that constitutes the carrying case 10 (FIG. 3), 1
Reference numeral 0B indicates an upper lid, 20 indicates a small screen, and 30 indicates a liquid crystal projector.

The upper lid 10B of the carrying case 10 is opened at 180 ° as shown by the chain double-dashed line in FIG. 3 and lifted upward in this state so that it can be removed from the lower case 10A. That is, the hinge portion 10C of the carrying case 10 is configured as shown in FIG. The carrying case 10 can accommodate a small screen 20 and a liquid crystal projector 30 that are folded as shown in FIG.

FIG. 1 shows a state in which the liquid crystal projector 30 is projecting on the small screen 20. As shown in the figure, the small screen 20 includes a mirror 20A connected in a folding screen, a transmissive screen 20B, and an entrance window 2.
It is composed of a shield plate 20C having 1 and a shield plate 20D. The small screen 20 is assembled by using the lower case 10A so that the periphery thereof has a trapezoidal shape, and the upper lid 10B is placed on the upper part. Although the mirror 20A of the small screen 20 and the shield plate 20D can be separated from each other, the lower case 10A has ribs for guiding the ends of the mirror 20A and the shield plate 20D as shown in FIG. 12 are provided.

In the small screen 20 assembled as described above, the projected image from the liquid crystal projector 30 which enters through the entrance window 21 is reflected by the mirror 20A and guided to the transmissive screen 20B, and the transmissive screen 20B.
Project a projected image on. Since the small screen 20 is assembled separately from the liquid crystal projector 30, the small screen 20 can be installed at a position away from the liquid crystal projector 30, whereby a sufficient enlarged projection distance can be secured and the transmissive screen 20B can be provided. The projected image can be projected large.

External light is also incident from the incident window 21,
Since the entrance window 21 itself is relatively small, the internal darkness is maintained, the contrast of the image on the screen 20B can be kept good even during the day, and the image can be fully viewed. Next, an outline of the liquid crystal projector 30 housed in the carrying case 20 will be described.

The cabinet 32 of the liquid crystal projector 30 is thinly formed in the vertical direction as shown in FIG. 1, an intake hole 32A and a left speaker grill 32B are formed on the left side surface, and the cabinet is shown on the right side surface. The exhaust hole and the grill for the right speaker are formed. On the back surface of the cabinet 32 opposite to the projection lens 40, A
C-code clamp portion 34A and carrying belt 3
A carrying unit 34 for carrying is made up of 4B. The clamp portion 34A can be used when the AC cord 35 for power input is wound as shown in FIG. Further, in FIG. 1, 36 is a volume knob, 3
Reference numeral 7 is an image quality adjusting knob, and 38 is a power switch.

FIG. 5 is a schematic view showing an internal configuration example of the liquid crystal projector 30. Note that FIG. 5 shows a case where a handle 34C is provided on the clamp portion 34A instead of the carrying belt 34B. In the figure, in the cabinet 32, a projection lens 40, a liquid crystal panel 41 of about 1 inch, a polarizing plate 32, a condenser lens 33, a heat ray cut filter 34, 100 volts,
The 150-watt halogen lamps with mirrors 35 are sequentially arranged in a line. A screw 40A is formed around the projection lens 40, so that the focus can be adjusted by rotating the projection lens 40.

Further, the lamp 4 is provided in the cabinet 32.
5, a lamp cooling fan 46 is arranged at a position facing the right side of the liquid crystal panel 5, and a liquid crystal panel cooling fan 47 is arranged at a position facing the left side of the liquid crystal panel 41. The lamp cooling fan 46 exhausts the air taken in from the intake holes 32A (see FIG. 1) as shown by the arrow in FIG. 5, mainly cools the lamp 45, and similarly the liquid crystal panel cooling fan 4 is cooled.
Reference numeral 7 blows the air taken in from the intake holes 32A as shown by the arrow in FIG. 5, mainly cools the liquid crystal panel 41, and the air used for cooling the liquid crystal panel 41 receives the exhaust holes ( It is discharged via (not shown). Under the lamp sheet metal, thermo switches 48 and 4 with different operating temperatures are used.
9 is provided, and the thermoswitch 48 on the high temperature side is O
When N, the lamp cooling fan 46 is driven, and when the low temperature side thermoswitch 49 is turned off, the lamp cooling fan 46 is stopped.

Further, in the cabinet 32, a video board 50, a power supply and audio board 51, and a transformer 5 are provided.
2. The fuse accommodating portion 53 is arranged, the left speaker 54L is arranged so as to face the speaker grill formed on the left side portion of the cabinet 32, and the speaker grill formed on the right side portion. A right speaker 54R is disposed so as to face the.

On the other hand, on the back surface of the cabinet 32, in addition to the handle 34C, the AC cord 35, the power switch 38,
A microphone volume 55, a microphone input terminal 56, a video input terminal 57, and audio input terminals 58L and 58R for the left channel (monaural) and the right channel are provided. In FIG. 5, reference numeral 59 is a height adjusting leg for adjusting the projection angle of the liquid crystal projector, the height of which is adjusted by rotation.

According to the liquid crystal projector 30 having the above structure, the video substrate 50 on which the liquid crystal drive circuit and the like are mounted is mounted.
Drives the liquid crystal panel 41 by appropriately processing the video signal input from the video input terminal 57, and reproduces an image corresponding to the video signal on the liquid crystal panel 41. Further, the light emitted from the lamp 45 enters the liquid crystal panel 41 through the heat ray cut filter 44, the condenser lens 43 and the polarizing plate 32, and illuminates the liquid crystal panel 41. Then, the transmitted light controlled by the liquid crystal panel 41 is enlarged and projected as an image on the screen through the projection lens 40.

Further, the power source and audio substrate 51 is
The left speaker 5 is generated by generating a required power supply for driving each circuit from a power supply input via the AC cord 35 and the transformer 52, and appropriately processing an audio signal input from the audio input terminals 58L and 58R.
4L and the right speaker 54R are driven to generate sound.

Although the small screen 20 of this embodiment also uses the carrying case 10 of the liquid crystal projector 30, the present invention is not limited to this, and the carrying case 10 may not be used. That is, FIG. 6 and FIG.
As shown in FIG. 5, a small screen 60 is configured by a side wall including a mirror 60A, a transmissive screen 60B, a shield plate 60C having an entrance window 61, and a shield plate 60D, which are foldably connected to each other, and a shield plate 60E serving as an upper lid. You may. Incidentally, in FIG. 6, 62A and 62B
Is an adhesive tape used when connecting the mirror 60A and the shielding plate 60D, respectively.

[0023]

As described above, according to the present invention, when a small screen is used, it is assembled in a box shape by a mirror, a transmissive screen, a shield plate having an entrance window, and a shield plate which are foldably connected to each other. Since the projection image incident from the entrance window is reflected at a substantially right angle by the mirror and guided to the transmissive screen and the projection image is projected on the transmissive screen, it can be installed at a position away from the projection device such as a liquid crystal projector, As a result, the enlarged projection distance can be secured, and a large-sized projection screen can be obtained. Also, since the darkness inside the small screen is maintained,
There is an advantage that the contrast of the image on the screen can be maintained well even in the daytime, and the small screen can be stored in a carrying case such as a liquid crystal projector by folding, and has good portability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of a carrying case type small screen according to the present invention.

FIG. 2 is an exploded perspective view showing a method of housing the liquid crystal projector and the small screen shown in FIG. 1 in a carrying case.

FIG. 3 is a perspective view showing an appearance of a carrying case in which the liquid crystal projector and the small screen shown in FIG. 1 are housed.

FIG. 4 is a view used for explaining a hinge portion of the carrying case.

FIG. 5 is a schematic diagram showing an example of the internal configuration of the liquid crystal projector.

FIG. 6 is a development view showing another embodiment of the small screen according to the present invention.

FIG. 7 is a perspective view showing an assembled state of the small screen of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Carrying case 10A ... Lower case 10B ... Upper lid 10C ... Hinge part 12 ... Rib 20, 60 ... Small screen 20A, 60A ... Mirror 20B, 60B ... Transmissive screen 20C, 20D, 60C, 60D, 60E ... Shielding plate 21, 61 ... Incident window 30 ... Liquid crystal projector

Claims (4)

[Claims] 1. A carrying case type small screen comprising a box-shaped carrying case for housing a device for projecting an image, and a small screen folded and housed in the carrying case, wherein the small screen comprises: Each is composed of a foldable connected mirror, a transmissive screen, a first shielding plate having an entrance window, and a second shielding plate, and is assembled in the carrying case so that its peripheral shape is trapezoidal. The assembled small screen reflects a projection image incident from the entrance window of the first shield plate at a substantially right angle by the mirror and guides it to the transmission screen, and projects the projection image on the transmission screen. Carrying case type small screen featuring. 2. The carrying case includes a lower case,
The carrying case type small screen according to claim 1, further comprising an upper lid separable from the lower case, wherein the small screen is assembled in the lower case, and an upper surface of the small screen is covered by the upper lid. 3. The small screen includes the mirror, a transmissive screen, a first shielding plate having an entrance window, and a second screen.
Carrying case type small screen, characterized in that a third shielding plate serving as an upper lid is connected to a side wall formed of the shielding plate. 4. A side wall comprising a mirror, a transmissive screen, a first shielding plate having an entrance window, and a second shielding plate,
A small screen that has a third shielding plate that serves as an upper lid, and is foldably connected to each other. The small screen is assembled so that its peripheral shape is a trapezoid, and the assembled small screen. Is a small screen characterized in that a projection image incident from an entrance window of the first shielding plate is reflected by the mirror at a substantially right angle to be guided to the transmission screen, and the projection image is projected on the transmission screen.