JP2000305175A - LCD projector - Google Patents

Abstract

(57) Abstract: A shutter is provided for an opening of a cooling fan and a projection lens, and the shutter is closed when not in use to prevent dust from entering the housing. Also, the power cannot be turned on unless the shutter is opened. An openable shutter (12, 15) is provided in an opening (10) behind a cooling fan (7) and an opening (11) in front of a projection lens (6), and is closed when not in use and opened when in use.
When the shutters 12, 15 are opened to the lower end by operating the handles 13, 16, the levers 14, 17 connected to the shutter move, and the switches 19, 20 are pushed on at the leading ends to be turned on. As a result, when the power switch 18 is turned on, the power is turned on to the power supply unit 8, the power is supplied to the light source lamp 2, the cooling fan 7, the signal processing circuit 9, and the like, and the light of the light source lamp is driven based on the video signal. The light enters the panel 4 and generates image light, which is projected on a screen by a projection lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector device, and more particularly to a liquid crystal projector device for preventing dust from entering through an exhaust port for a cooling fan and a gap between a projection lens and a housing.

[0002]

2. Description of the Related Art In a liquid crystal projector, a powerful lamp is used to brighten a projected image on a screen.
For this reason, the temperature inside the housing becomes high, the temperature of the liquid crystal panel rises, the performance deteriorates, the image quality of the projected image deteriorates, and the life of the lamp is adversely affected. For this reason, although an opening is provided behind the light source lamp, a cooling fan is attached and forced exhaust is performed to suppress a rise in the temperature inside the housing, there is a problem that dust enters from the exhaust port. When dust adheres to optical components, especially to a liquid crystal panel, there is a problem that the shadow of the dust is enlarged and projected on a screen together with an image, thereby deteriorating the image quality. Further, dust easily enters from a gap between the projection lens and the main body.

[0003]

In view of the foregoing, the present invention provides a shutter in front of an opening for a cooling fan and a projection lens to prevent dust from entering the housing. An object of the present invention is to prevent the power of the apparatus from being turned on unless the shutter is opened, and to prevent trouble due to forgetting to open the shutter.

[0004]

In order to achieve the above object, a liquid crystal projector according to the present invention irradiates a liquid crystal panel driven on the basis of a video signal with light from a light source lamp to generate an image generated by the liquid crystal panel. Light is projected on a screen by a projection lens, an opening is provided in a portion of the housing behind the light source lamp, and a cooling fan for discharging heat from the light source lamp is provided in the opening, and the opening is provided. An openable / closable first shutter for shielding is provided, and when the apparatus is not used, the first shutter is closed to prevent dust from entering the housing. Further, an opening / closing second shutter for shielding the opening is provided at an opening in front of the projection lens of the housing, and the second shutter is provided together with the first shutter when the apparatus is not used.
The shutter is closed to prevent dust from entering the housing.

A first lever connected to the first shutter and interlocking with the first shutter, and a first switch which is pressed down and turned on by the first lever when the first shutter is moved to a position to open the opening. The first switch is inserted in series with the input circuit of the power supply unit, and when the first switch is turned on,
You can turn on the power by operating the power switch,
A second lever connected to the second shutter and interlocking with the second shutter; and a second switch that is pressed down and turned on by the second lever when the second shutter is moved to a position to open an opening in front of the projection lens. And a second switch may be connected in series with the first switch so that the power can be turned on by operating the power switch when the first switch and the second switch are turned on.

Alternatively, when the first shutter is moved to a position where the opening is opened, a third switch which is depressed and actuated by the first lever and a power supply unit which is operated by a preheat power supply and is activated based on a signal of operation of the third switch. A microcomputer (hereinafter abbreviated as “microcomputer”) is provided so that it can be turned on.
The power supply unit is controlled to be turned on by the microcomputer so that the power can be turned on by operating a power switch, or a second lever connected to the second shutter and interlocking with the second shutter; And a fourth switch which is depressed and actuated by the second lever when the is moved to a position where the opening in front of the projection lens is opened, and the microcomputer turns on the power supply unit based on the operation signals of the third and fourth switches. Control may be performed so that the power can be turned on by operating a power switch.

[0007] Alternatively, an operation key for opening and closing the first shutter, a first shutter driving unit for driving the first lever based on a signal from the operation key to open and close the first shutter,
A third switch that is depressed and actuated by the first lever when the first shutter is moved to a position to open the opening by the first shutter driving unit, and controls the power supply unit to be turned on based on a signal of the operation of the third switch. A microcomputer, the operation keys,
A first shutter drive unit and a preheat power supply for supplying power to the microcomputer, wherein the power supply unit is controlled to be on by the microcomputer so that the power can be turned on by operating a power switch; A second shutter drive unit that operates with a power supply, drives a second lever based on an open / close operation signal from an operation key to open / close a second shutter, and causes the second shutter drive unit to move the second shutter in front of the projection lens. And a fourth switch which is depressed and actuated by a second lever when the opening of the opening is moved to a position to be opened. A microcomputer controls a power supply to be turned on by a microcomputer based on an operation signal of the third switch and the fourth switch. Alternatively, the power may be turned on by operating the power switch.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a configuration diagram of a main part of an embodiment of a liquid crystal projector device according to the present invention. In the figure, reference numeral 1 denotes a housing of the liquid crystal projector. Reference numeral 2 denotes a light source lamp which collects white light from a metal halide lamp or the like with a parabolic mirror or the like, emits the light forward (to the right in the drawing), and enters a color separation optical system 3 (configured with a dichroic mirror or the like). Red,
Decomposes into green and blue light. Reference numerals 4 denote liquid crystal panels for red, green and blue, which are driven based on the video signals of the respective colors from the signal processing unit 9 and which transmit or block the respective color lights from the color separation optical system 3 to generate the video lights of the respective colors. A color image is synthesized by a color synthesizing optical system 5 (constituted by a dichroic mirror or the like), and enlarged and projected on a screen by a projection lens 6. Reference numeral 7 denotes a cooling fan which exhausts the air in the housing 1 which has been heated to a high temperature due to the heat of the light source lamp 2 to the rear (left side in the drawing) from the opening 10. Reference numeral 8 denotes a power supply unit, and the light source lamp 2 and the cooling fan 7
And power to the signal processing unit 9 and the like. Reference numeral 11 denotes an opening in front of the projection lens 6. 12 is a first shutter, a handle 13
To open and close. Reference numeral 14 denotes a first lever, and a first shutter 12
Are connected to the first shutter 12 and the first shutter 12
Is pushed down to the lower end, the first switch 19 is pushed down at the tip and turned on. Reference numeral 15 denotes a second shutter, which is opened and closed by operating the handle 16. Reference numeral 17 denotes a second lever, which is connected to the second shutter 15 and interlocks with the second shutter 15, and when the second shutter 15 is pushed down to the lower end, the second switch 20 is pushed down at the tip and turned on.

When the apparatus is not used, the first shutter 12 is held by the handle 13
Operation, the opening 10 is closed, the opening 10 is closed,
Prevents dust from entering inside. When using the device the first
The shutter 12 is pulled down to the lower end of the opening 10 and the cooling fan 7
So that the exhaust air is not blocked. When the apparatus is not used, the second shutter 15 is also raised to the position shown in the figure by operating the handle 16, and the opening 11 is closed. When the apparatus is used, the second shutter 15 is lowered to the lower end of the opening 11, and the projection lens The optical path of No. 6 is not blocked. By opening the two shutters, the first switch 19 and the second switch 20 are turned on.
When the power switch 18 is turned on, AC power is supplied to the power supply unit 8 and each unit operates.

FIG. 2 is a block diagram of a main part of another embodiment.
Is the first lever 14 when the first shutter 12 is pushed down to the lower end.
The third switch 22 is operated by being pushed by the tip of the second lever 22. The fourth switch 22 is operated by being pushed by the tip of the second lever 17 when the second shutter 15 is pushed down to the lower end, and 23 is a power source from the preheat power source 24. The microcomputer, which is always in operation, controls the power supply unit 8 to be in an ON state by an operation signal of the third switch 21 and the fourth switch 22. With the first shutter 12 and the second shutter 15 fully opened, the power switch 18
Is turned on, AC power is supplied to the power supply unit 8, and power is supplied to the light source lamp 2, the cooling fan 7, the signal processing unit 9, and the like, and the apparatus is brought into an operation state. The other operations of the respective units and the operation method of the two shutters are the same as those in FIG.

FIG. 3 is a diagram showing a main part of another embodiment.
Reference numeral 31 in the figure denotes operation keys for opening and closing the first shutter 12 and the second shutter 15. Reference numeral 32 denotes a microcomputer which is always operated by a power supply from the preheat power supply 24. The microcomputer 32 operates the first shutter drive unit 33 with the power supply from the preheat power supply 24 in response to a shutter opening signal from the operation key 31, and operates the first lever 14 Move, open the first shutter 12, and at the same time
The second shutter driving unit 34 is operated with the power supplied from the power source, the second lever 17 is moved, and the second shutter 15 is opened. As a result, the third switch 21 and the fourth switch 22 are connected to the first lever.
14 and the tip of the second lever 17 are pressed to operate.
Is turned on, and when the power switch 18 is turned on, the AC power is supplied to the power supply unit 8 to supply power to the light source lamp 2, the cooling fan 7, the signal processing unit 9, and the like, thereby bringing the device into an operation state. In order to stop the operation of the apparatus, first, the power switch 18 is turned off to stop the operation of the liquid crystal projector, and then, the operation of the operation key 31 is performed to close the shutter. The microcomputer 32 causes the microcomputer 32 to operate the first shutter driving unit 33 and the second shutter driving unit 34 to drive the first lever 14 and the second lever 17 and close the first shutter 12 and the second shutter 15. The description of the parts performing the same operations as those in FIG. 1 or FIG. 2 is omitted.

In the above description, the first shutter 12 and the second shutter
When the power switch 18 is turned on when both the shutters 15 are opened, the AC power is input to the power supply unit 8 and the apparatus operates. However, when the first shutter 12 is opened (that is, the first switch 19 is turned on, Alternatively, the device may be operated by turning on the power switch 18 (the third switch 21 is operated). This is because even if the second shutter 15 is forgotten to be opened, if the power is turned on, the strong light of the light source lamp 2 leaks from the ventilation port and the like.
In addition, the second shutter 15
Because he will forget to open it. The second shutter 15
, The lens cover of the projection lens 6 is not required.

[0013]

As described above, according to the liquid crystal projector of the present invention, the opening and closing shutter is provided at the opening for the cooling fan and the opening for the projection lens.
The shutter is closed when not in operation, so that external dust does not enter the housing, preventing dust from adhering to the LCD panel and enlarging and projecting the shadow of the dust on the screen, thereby deteriorating the image quality. Can be. Further, since the power cannot be turned on unless the shutter is opened, the exhaust is not performed by the cooling fan, and the temperature inside the apparatus can be prevented from abnormally rising.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an embodiment of a liquid crystal projector device according to the present invention.

FIG. 2 is a main part configuration diagram of another embodiment of the liquid crystal projector device according to the present invention.

FIG. 3 is a main part configuration diagram of another embodiment of the liquid crystal projector device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 housing 2 light source lamp 3 color separation optical system 4 liquid crystal panel 5 color synthesis optical system 6 projection lens 7 cooling fan 8 power supply unit 9 signal processing unit 10, 11 opening 12 first shutter 13, 16 handle 14 first lever 15 Second shutter 17 Second lever 18 Power switch 19, 20, 21, 22 First to fourth switches 23, 32 Microcomputer 24 Preheat power supply 31 Operation keys 33 First shutter drive unit 34 Second shutter drive unit

Claims (8)

[Claims] 1. A light source for irradiating a liquid crystal panel driven based on an image signal with light from a light source lamp, and projecting image light generated by the liquid crystal panel onto a screen by a projection lens, wherein the light source of the housing is provided. An opening is provided behind the lamp, a cooling fan for discharging heat from the light source lamp is provided in the opening, and an openable / closing first shutter for shielding the opening is provided. A liquid crystal projector device in which a first shutter is closed to prevent dust from entering a housing. 2. An opening / closing second shutter for closing an opening at an opening of the housing in front of the projection lens, and when the apparatus is not used, the second shutter is closed together with the first shutter. 2. The liquid crystal projector according to claim 1, wherein dust is prevented from entering the body. 3. A first lever connected to the first shutter and interlocking with the first shutter, and a first lever which is pressed down and turned on by the first lever when the first shutter is moved to a position to open the opening. 3. The liquid crystal projector device according to claim 1, further comprising a switch, wherein the first switch is inserted in series with an input circuit of the power supply unit, and the power can be turned on by operating the power switch when the first switch is turned on. . 4. A second lever connected to the second shutter and interlocking with the second shutter, and depressed by the second lever when the second shutter is moved to a position to open an opening in front of a projection lens. A second switch for turning on the power switch, wherein the second switch is connected in series with the first switch, and the power can be turned on by operating a power switch when the first switch and the second switch are turned on. 4. The liquid crystal projector device according to 2, 3 or 4. 5. A first lever connected to the first shutter and interlocking with the first shutter, and a third lever operated by being pushed down by the first lever when the first shutter is moved to a position to open the opening. A switch and a microcomputer that operates with a preheat power supply and controls the power supply unit to be able to be turned on based on a signal of the operation of the third switch, and the power supply unit is controlled to be able to be turned on by the microcomputer. 3. The liquid crystal projector device according to claim 1, wherein the power can be turned on by an operation. 6. A second lever connected to the second shutter and interlocking with the second shutter, and depressed by the second lever when the second shutter is moved to a position to open an opening in front of a projection lens. And a fourth switch that operates, wherein the microcomputer controls the power supply unit to be able to be turned on based on the operation signals of the third switch and the fourth switch, so that the power can be turned on by operating the power switch. The liquid crystal projector device according to claim 1, 2 or 5. 7. An operation key for opening and closing the first shutter, a first lever connected to the first shutter and interlocking with the first shutter, and driving the first lever based on a signal from the operation key. A first shutter driving unit that opens and closes the first shutter, a third switch that is pressed and operated by the first lever when the first shutter moves to a position that opens the opening by the first shutter driving unit, and a third switch. A microcomputer for controlling a power supply unit to be turned on based on a signal of a switch operation, and a preheating power supply for supplying power to the operation key, the first shutter driving unit and the microcomputer, and the power supply unit can be turned on by the microcomputer 3. The liquid crystal projector device according to claim 1, wherein the power is turned on by operating a power switch. Place. 8. A second lever connected to the second shutter and interlocking with the second shutter, operated by a power supply from the preheating power supply, and driving the second lever based on an open / close operation signal from the operation key. A second shutter drive unit for opening and closing the second shutter, and a second shutter drive unit which is depressed and operated by the second lever when the second shutter drive unit moves the second shutter to a position to open an opening in front of the projection lens. A power supply unit is controlled so as to be able to be turned on by the microcomputer based on an operation signal of the third switch and the fourth switch, and the power can be turned on by operating a power switch. 8. The liquid crystal projector according to 2 or 7.