JPH04262686A - Video projector - Google Patents

Abstract

PURPOSE:To drive a video projector by a battery and to make the video projector small and light in weight. CONSTITUTION:The armor case of the video projector is constituted by a cabinet which is vertically bi-sected and by a cover 20 arranged behind the cabinet. The cover 20 is arranged in freely attachably and detachably as against the cabinet and a lamp 36 which constitutes a projector light source is easily exchanged by opening the cover 20 positioned behind the projector light source. A battery attaching part to mount the battery 70 for driving the projector is formed on the back surface of the cover 20 so that the battery 70 is attached outside on the back surface of the cover 20.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector, and more particularly to a video projector that enlarges and projects an image displayed on a transmissive display means such as a transmissive liquid crystal panel using a projection lens and a projector light source.

0002

2. Description of the Related Art Generally, this type of video projector uses a lamp with large power consumption (for example, a halogen lamp of several hundred watts) as a projector light source. In addition, by using the LCD viewfinder of a camera-integrated VTR, placing a high-brightness projector light source in place of a normal backlight, and reversing the displayed image vertically and/or horizontally, the LCD viewfinder can be used as a video camera. There is one that can be used as a projector (Japanese Utility Model Publication No. 1-115371).

0003

[Problem to be Solved by the Invention] However, conventional dedicated video projectors only use commercial power because the power consumption of the projector light source is large.
Furthermore, since the heat generated by the projector light source is large, the cooling fan must also be large, and for this reason, there has been no compact, lightweight dedicated video projector that can be powered by a battery and is convenient to carry.

On the other hand, as mentioned above, the camera-integrated VTR's LCD viewfinder is also used as a video projector. In order to enlarge and project the same image as , it is necessary to invert the viewfinder image vertically and/or horizontally and project it, which makes the configuration complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compact and lightweight video projector that can be powered by a battery and is easy to use.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a cabinet divided into two parts vertically or horizontally, a projection lens disposed inside the cabinet, and an image display based on a video signal. a transmissive display means and a projector light source, and a lid for replacing a lamp that is detachably disposed at the rear of the cabinet and constitutes the projector light source, and for mounting a battery for driving the projector on the back thereof. A lid having a battery attachment part.

[0007] The invention also includes a cabinet divided into two vertically or horizontally, a projection lens disposed in the cabinet, a transmissive display means and a projector light source for displaying an image based on a video signal, and the transmissive display means. a cooling fan disposed on the side of the cabinet, an air intake formed on the side of the cabinet opposite to the fan, and an input of the video signal disposed adjacent to the air intake; It features a jack for

[0008]

According to the present invention, the exterior case of the video projector is constituted by a cabinet divided into two parts, either vertically or horizontally, and a lid disposed at the rear of the cabinet. The lid is removably attached to the cabinet, and the lamp constituting the projector light source can be easily replaced by opening the lid located behind the projector light source. Further, the lid has a battery mounting portion formed on its back surface for mounting a battery for driving the projector, so that the battery can be externally mounted on the back surface of the lid.

[0009] Furthermore, an air intake port is formed on the side of the cabinet facing the cooling fan disposed on the side of the transmissive display means, and a video signal is input adjacent to the air intake port. input jack is provided. Since the connection cord is inserted into this input jack, there is no possibility that the air intake will be blocked by a wall or the like due to the above-mentioned positional relationship between the input jack and the air intake.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the video projector according to the present invention will be described in detail below with reference to the accompanying drawings. Figures 1 to 3
1A and 1B are a plan view, a side view, and a front view, respectively, showing the appearance of a video projector according to the present invention. Further, FIG. 4 is an exploded perspective view showing the detailed configuration of the video projector.

As shown in these drawings, this video projector has a cabinet 10A divided into upper and lower halves.
, 10B and a lid 20 disposed at the rear of the cabinets 10A, 10B constitute an exterior case of the video projector. Cabinet 10A, 10B
At the center of the interior are a projection lens 30, an approximately 1-inch light-transmissive liquid crystal panel 31, a polarizing plate 32, and a condenser lens 33.
, a heat ray cut filter 34, a lamp support ring 35, and an 18-watt mirrored halogen lamp 36 are sequentially arranged in a line (see FIG. 5). As shown in FIG. 4, a screw 30A is formed around the projection lens 30, so that focusing can be performed by turning the projection lens 30. Further, 30B is a lens cap.

An air intake port 11 is formed in one side of the cabinets 10A and 10B, and the upper cabinet 1
An air outlet 12 is formed in the upper part of 0A. In addition, an opening 1 for an input jack is provided adjacent to the air intake port 11.
3 are formed, and furthermore, grilles 14R and 14L for stereo speakers are formed on both sides of the cabinet. Furthermore, a female screw 15 for attaching a tripod is fixed to the bottom of the lower cabinet 10B by screws 116, 16. A cooling fan 17 is disposed at a position facing the air intake port 11, and an input jack 18 for inputting video signals and left and right audio signals is disposed at the opening 13.
Further, a right speaker 19R and a left speaker 19L are arranged at positions facing the grills 14R and 14L. Note that 18A is a decorative cover.

Furthermore, inside the cabinets 10A and 10B, there are a power supply and audio board 40, a video board 50,
A DC/DC converter 60 is provided. The power supply and audio board 40 is provided with four terminal pins 41 for power input, and these terminal pins 41 are arranged so as to elastically protrude from the convex portion 41A at the rear of the cabinet. The board 40 also includes a DC jack 42, power ON/OFF switches 43A, 43B,
A volume 45A, connectors 46A to 46D, an angle 47 for attaching the lid 20, a relay 48, and the like are provided.

An audio connector 18B of the input jack 18 is connected to the connector 46A, a connector 60A on the input side of the DC/DC converter 60 is connected to the connector 46B, and speakers 19R and 19L are connected to the connectors 46C and 46D, respectively. connectors 19RA and 19LA are connected. Cord 17A of fan 17 and lamp terminal block 2
1 code 21A is the output terminal 40A of the board 40, respectively.
, 40B.

Further, a power button 43 and a volume knob 45 are provided in the cabinets 10A and 10B, respectively, facing the power ON/OFF switches 43A and 43B and the volume 45A (see FIG. 2). When the power button 43 is slid, the switch 43A is activated to turn on the power, and when the power button 43 is pressed, the switch 43B is activated to turn off the power. Also, by sliding the volume knob 45, the speaker 1
Volumes of 9R and 19L are adjusted.

A liquid crystal drive circuit and the like are mounted on the video board 50. In addition, 52A to 52C are connectors,
A flexible printed wiring connector 31A of the liquid crystal panel 31 is connected to the connector 52A, and a connector 52B is connected to the connector 52A.
Connector 60 on the output side of the DC/DC converter 60
A video connector 18C of the input jack 18 is connected to the connector 52C. Further, 54 is a knob for adjusting brightness.

On the other hand, the lid 20 is detachably disposed at the rear of the cabinet so that the lamp 36 can be replaced. That is, a screw 24 having a retaining washer 24A is attached to the lid 20, and the lid 20 is inserted into a predetermined position at the rear of the cabinet, and the screw 24 is set at an angle 47 using a coin.
The lid 20 can be attached by screwing it on. Further, a battery mounting portion 20A for mounting a battery 70 (see FIG. 5) for driving the projector is formed on the back surface of the lid 20, and a power input terminal formed on the cabinet side is formed on the inside of the lid 20. A recess 20B is formed into which the protrusion 41A including the pin 41 fits. When the lid 20 is attached, the terminal pin 41 is inserted into the recess 20.
It faces the battery mounting surface of the lid 20 through B. This eliminates the need to provide the power input terminal directly on the lid 20, and the wiring and the like do not get in the way when the lid 20 is opened and closed. Further, a substantially U-shaped elastic wire 26 is disposed inside the lid 20, and a preliminary lamp 28 is held between the wire 26 and the inside of the lid 20.

Next, the operation of the video projector according to the present invention will be explained. 6 is a rear view of the video projector with the lid 20 removed, and FIG. 7 is a rear view of the video projector with the lid 20 removed, and FIG.
It is a sectional view along a line. As shown in these drawings, an elastic wire 22 is disposed on the lamp terminal block 21, and the lamp 36 loaded in the lamp terminal block 21 is supported by the elastic force applied via the wire 22. It is fixed so as to be pressed against the ring 35.

When replacing the lamp 36, first press the wire 22 against its elastic force to disengage the wire 22 from the engaging parts 25, 25 that hold the wire 22.
The wire rod 22 is rotated counterclockwise in FIG. Thereby, the lamp 36 can be taken out from inside the cabinet. On the other hand, when fixing the lamp 36 in the cabinet, the wire rod 22 is tilted as shown by the broken line in FIG.
The lamp 36 is inserted so that the lamp 36 contacts the lamp support ring 35, and then the wire 22 is rotated clockwise in FIG. As a result, the wire rod 22 is pushed up along the tapered portions 25A, 25A, and the engaging portion 25,
25.

As described above, since the lid 22 is located behind the lamp 36, the lamp 36 can be easily replaced by opening the lid 20. Further, in the present invention, a battery 70 for driving the projector is externally attached to the battery attachment portion 20A formed on the lid 20. It is also possible to provide a battery mounting part on the top or side of the cabinet, but in this case, the heavy battery will make the compact and lightweight video projector less stable. In this case, it becomes impossible to provide a tripod mounting female screw or the like for mounting the video projector on a tripod. Furthermore, it is also conceivable to form a battery storage section within the cabinet, but in this case, the cabinet itself becomes larger. That is, a configuration in which a battery mounting part is formed on the rear lid of the cabinet and a battery is externally attached thereto is optimal for making the video projector smaller and lighter.

Furthermore, as shown in FIG. 5, a cooling fan 1 is provided.
7 is arranged on the side of the liquid crystal panel 31, and the fan 1
7 blows air taken in from the air intake port 11 (see FIG. 4) as shown by the arrow in FIG.
to cool down. The air used to cool the liquid crystal panel 31 is guided rearward by the video board 50 and is discharged through the air outlet 12 (see FIG. 4) substantially above the lamp 36. Note that some of the air flows along the bottom of the cabinet and is exhausted via the air outlet 12. This allows components other than the liquid crystal panel, such as lamps, to be cooled as well. Further, since the video board 50 is also cooled, there is an advantage that there is no need to separately provide a partition wall to protect the board from heat.

Furthermore, since an input jack 18 into which a connection cord is inserted is provided adjacent to the fan 17,
There is no possibility that the air intake port 11 facing the fan 17 will be blocked by a wall or the like.

[0023]

[Effects of the Invention] As explained above, according to the video projector of the present invention, since the battery is externally attached to the lid detachably disposed at the rear of the cabinet, it can be powered by the battery and the lamp can be easily replaced. It is also possible to provide a small and lightweight video projector that is easy to use. Furthermore, since the input jack is disposed adjacent to the air intake port of the cooling fan, there is no possibility that the air intake port will be blocked by a wall or the like. Furthermore, a circuit board is provided to face the fan across the transmissive display means and the projector light source, and this circuit board directs air blown from the fan through the transmissive display means to the projector light source disposed behind it. Since the guiding flow path is configured, it is possible to cool the circuit board, and there is an advantage that there is no need to separately provide a partition wall to protect the circuit board from heat.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the appearance of a video projector according to the present invention.

FIG. 2 is a side view showing the appearance of a video projector according to the present invention.

FIG. 3 is a front view showing the appearance of a video projector according to the present invention.

FIG. 4 is an exploded perspective view showing the detailed configuration of the video projector according to the present invention.

FIG. 5 is a schematic diagram showing the internal configuration of a video projector according to the present invention.

FIG. 6 is a rear view of the video projector according to the present invention with the lid removed.

FIG. 7 is a sectional view taken along line A--A in FIG. 6;

[Explanation of symbols]

10A, 10B...cabinet 11...Air intake 12...Air outlet 15...Female thread for tripod mounting 17...Fan 18...Input jack 19R, 19L...Speaker 20...Lid 20A...Battery mounting part 26...Wire rod 28...Spare lamp 30...projection lens 31...LCD panel 36...Lamp 40...Power supply and audio board 50...Video board 70...Battery

Claims (7)

[Claims] 1. A cabinet divided into two parts vertically or horizontally, a projection lens disposed within the cabinet, a transmissive display means for displaying an image based on a video signal, and a projector light source, and a projector light source disposed at the rear of the cabinet. A lid for replacing a lamp that is removably arranged and that constitutes the projector light source, the lid having a battery mounting part on the back surface for mounting a battery for driving the projector. video projector. 2. The video projector according to claim 1, wherein the lid has a lamp mount inside thereof to which a spare lamp is installed. 3. A convex portion including a power input terminal formed on the cabinet side facing the lid, and a recess formed on the lid into which the convex portion fits, the power input terminal being connected to the battery mounting portion. 3. The video projector according to claim 1, further comprising a recess that can be brought into contact with a terminal of a battery mounted on the video projector. 4. The video projector according to claim 1, wherein speakers are arranged on the left and right sides of the cabinet, respectively. 5. The video projector according to claim 1, wherein a female thread for attaching a tripod is provided on the lower surface of the cabinet. 6. A cabinet divided into two vertically or horizontally, a projection lens disposed within the cabinet, a transmissive display means and a projector light source that display an image based on a video signal, and the transmissive display means. a cooling fan disposed on the side of the cabinet, an air intake formed on the side of the cabinet opposite to the fan, and an input of the video signal disposed adjacent to the air intake; A video projector characterized by being equipped with an input jack for 7. An air outlet formed in an upper part of the cabinet facing the projector light source, and a circuit board disposed so as to face the fan across the transmissive display means and the projector light source. The circuit board has a part of a flow path that guides air blown from the fan through the transmission type display means to the air outlet through a projector light source arranged behind the transmission type display means. 7. The video projector according to claim 6, further comprising: