JP2010271346A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of preventing a filter from clogging without requiring human's judgement and manual operation. <P>SOLUTION: The projector 100 includes: the filter 25 which covers a suction port 23 for taking in outside air; a projection lens 3; a projection window 2 through which luminous flux emitted from the projection lens 3 is allowed to pass; and a lens cover 4 which opens/closes a luminous flux-passing port by slide movement. The projector 100 further includes filter cleaning members 30 and 40 which perform cleaning of the filter 25 at least either when the projection window 2 is opened or when it is closed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projector including a filter for removing dust from air sucked by a cooling fan for preventing temperature rise in a housing.

  2. Description of the Related Art Conventionally, a projector is provided with an intake fan for air cooling in order to prevent an excessive temperature rise such as a liquid crystal panel and a light source lamp. In addition, a filter for removing dust and the like from the air taken in by the intake fan is provided.

Patent Document 1 describes a projector that prevents a reduction in cooling effect due to clogging of a filter and greatly reduces filter replacement or cleaning work.
That is, in a projector that performs forced air cooling, a removable pre-filter unit, a movable pre-filter, an air filter having a dust-proof performance with a smaller removal particle size than the pre-filter, and dust adhering to the pre-filter By removing the brush and the pre-filter movable mechanism, dust and dust collected on the pre-filter are removed.

JP 2008-65021 A

  In the projector described in Patent Document 1, clogging detection by a clogging sensor and the elapse of a predetermined time are triggers for starting the prefilter movement. Therefore, it is assumed that a certain amount of dust is removed by the brush after adhering to the prefilter. For this reason, the dust removed by the brush is accumulated in the filter unit. Finally, the user must predict the dust accumulation level in the filter unit, remove the filter unit at an appropriate timing, and discard the dust accumulated in the filter unit.

  That is, when discarding the dust accumulated in the filter unit, the user first turns off the projector and removes the filter unit. And after cleaning a filter unit with a vacuum cleaner etc., the removed filter unit is attached to the original position, and the step which turns ON a power supply is required. As described above, in order to dispose of dust, the judgment of a user, that is, a human being, and manual work are indispensable.

  The present invention has been made to solve the above problems, and provides a projector capable of preventing clogging of a filter without requiring human judgment and manual work. Objective.

The present invention that can solve the above-described problems is a filter that covers an air intake port for taking in outside air, a projection lens, a light beam passage port that allows a light beam emitted from the projection lens to pass therethrough, and the light beam passage by sliding. A projector having an opening / closing cover for opening and closing a mouth, further comprising a filter cleaning means for cleaning the filter at least when the light beam passage opening is opened or closed.
According to the above configuration, the filter is cleaned at least one of when the cover is opened and when it is closed. Usually, when the opening / closing cover is opened, the projection is started, and when the opening / closing cover is closed, the projection is finished. That is, since the filter cleaning is performed at least one of when the projection is started and when the projection is completed, the filter cleaning is performed more frequently than before, and the filter can be prevented from being clogged. When cleaning is performed after clogging occurs, it is necessary to remove dust accumulated in the filter. According to the present invention, it is possible to prevent the filter from being clogged without requiring human judgment and manual work.

Further, in the present invention, the filter cleaning means operates in conjunction with the sliding movement of the opening / closing cover.
According to the above configuration, the filter cleaning unit operates in conjunction with the sliding movement of the opening / closing cover, so that it is not necessary to provide an independent drive mechanism or the like as the filter cleaning unit, and it is possible to prevent an increase in cost. it can.

Further, in the present invention, a first filter cleaning means having a first protrusion and a second protrusion, and an uneven portion in which a recess and a protrusion corresponding to the shape of the first protrusion are repeatedly formed. A second filter cleaning means comprising:
The second protrusion may move up and down on the filter when the first protrusions are alternately fitted in the recesses by the sliding movement.
According to the above configuration, the second protrusion provided on the first filter cleaning means moves up and down on the filter as the open / close cover slides, so a small amount of dust adhered to the filter by this up and down movement. Can be removed. For this reason, the clogging prevention effect can be exhibited more effectively.

In the present invention, a cover opening / closing detection unit for detecting opening / closing of the opening / closing cover is further provided, and the filter cleaning means operates in response to a detection signal from the cover opening / closing detection unit.
According to the above configuration, even if there is no space for providing the filter cleaning means that operates in conjunction with the sliding movement of the opening / closing cover, even if there is no space inside the projector, if the opening / closing detection can be detected by the cover opening / closing detection unit, the opening / closing cover is linked It is also possible to employ a filter cleaning means that does not. For example, when opening / closing of the opening / closing cover is detected, the dust attached to the outer surface of the filter can be removed by temporarily rotating the intake fan reversely.

1 is an overview perspective view of a projector according to a first embodiment. It is the figure which showed typically the internal structure of the periphery of a projection lens from the front direction of a projector. It is the schematic diagram which showed a mode that the dust adhering to a filter was removed. It is the block diagram which showed the internal structure of the projector of 2nd Embodiment.

(First embodiment)
Hereinafter, a projector according to an embodiment of the present invention will be described.
As shown in FIG. 1, a projector 100 according to the present embodiment has an exterior formed of a housing 1. A projection lens unit 50 including a plurality of lens groups is installed on the front surface of the projector 100. A lens filter 3 constituting the projection lens unit 50 is installed on the exit side opening surface of the projection lens unit 50. The lens filter 3 is made of glass or the like and protects the projection lens unit 50. In addition, a projection window 2 serving as a substantially rectangular opening is formed in the housing 1 in front of the lens filter 3. The projection window 2 serves as a light beam passage port through which the light beam emitted from the projection lens unit 50 passes.

  A lens cover 4 (open / close cover) is provided on the inner surface side of the housing 1 in the vicinity of the projection window 2. When the projector 100 is not used, the projection lens unit 50 is protected by closing the projection window 2 with the lens cover 4. Further, when the projector 100 is used, it is possible to project an image from the projection lens unit 50 by opening the projection window 2. Note that a lens cover operation unit 5 for sliding the lens cover 4 slightly protrudes from the upper surface of the housing 1 near the upper portion of the lens cover 4 on the upper surface of the projector 100. A lens cover operation unit opening 6 for enabling the lens cover operation unit 5 to operate is formed in the housing 1. The user can slide the lens cover 4 by holding the lens cover operation unit 5 and sliding it left and right. FIG. 1 shows a state in which the projection window 2 is closed approximately half by the lens cover 4.

  Further, a lens adjustment opening 9 is formed behind the lens cover operation unit 5, and the focus adjustment lever 7 constituting the projection lens unit 50 and the zoom adjustment lever via the lens adjustment opening 9. 8 protrudes. The user can adjust the focus of the projected image by holding the focus adjustment lever 7 and rotating it left and right. Further, the user can adjust the zoom of the projected image by holding the zoom adjustment lever 8 and rotating it left and right.

  An operation unit 10 is installed behind the upper surface of the projector 100. The operation unit 10 includes a key switch and accepts a functional operation of the projector 100 by the user. A remote control light receiving unit 11 is installed on the front surface of the projector 100. The remote control light receiving unit 11 receives a functional operation of the projector 100 by a user using a remote controller (not shown). A foot adjustment lever 12 is installed below the front surface of the projector 100. The foot adjustment lever 12 adjusts the inclination angle of the projector 100 by extending or contracting the foot (not shown) of the projector 100.

FIG. 2 is a diagram schematically showing the internal structure around the projection lens unit 50 from the front direction of the projector 100.
An air inlet 23 is formed on the bottom surface 20 of the housing 1 of the projector 100, and a filter 25 is installed on the inner surface side of the housing 1 so as to cover the air inlet 23. A second filter cleaning member 30 is fixed so as to face the filter 25, and a cooling fan 27 is installed so as to face the second filter cleaning member 30.

When the cooling fan 27 rotates, outside air outside the projector 100 is sucked into the projector 100 through the air inlet 23 and the filter 25. The sucked outside air is introduced by the cooling fan 27 and discharged from the discharge port of the cooling fan 27. The outside air discharged from the cooling fan 27 is blown to a lamp (not shown).
The second filter cleaning member 30 has a concavo-convex portion 31 formed of a plurality of convex portions and concave portions in the direction of the bottom surface 20 of the projector 100.

  In addition to the lens cover operation unit 5, a first filter cleaning member 40 is formed on the lens cover 4. The first filter cleaning member 40 includes a stretching member 41 that extends in the direction of opening the projection window 2 (arrow A), and protrusions 43 and 45 (first protrusions) that are discharged vertically to the tip of the stretching member 41. , Second protrusion).

  Since the convex shape of the first protrusion 43 of the first filter cleaning member 40 corresponds to the concave portion of the concave-convex portion 31 of the second filter cleaning member 30, when the lens cover 4 is slid in the direction of arrow A, The state in which the first protrusions 43 are fitted into the recesses alternately occurs.

That is, when the lens cover 4 is slid in the direction of the arrow A, the state in which the first protrusions 43 are inserted into the recesses of the recesses and protrusions 31 occurs alternately and continuously. As shown in FIG. The second protrusion 45 of the cleaning member 40 moves on the surface of the filter 25 while vibrating vertically (arrow B).
The first filter cleaning means 40 operates in conjunction with the sliding movement of the lens cover 4, so that the protrusion 45 strikes the filter 25 from the inside of the projector 100 to the outside.

For this reason, when the outside air is sucked by the cooling fan 27, the dust attached to the outer surface 25a of the filter 25 is knocked down. The above-described operation is performed not only when the projection window 2 is opened by the lens cover 4 but also when the projection window 2 is closed by sliding the lens cover 4 in the direction opposite to the arrow A direction.
Thus, in the present embodiment, the function as the filter cleaning means is realized by the two members of the first filter cleaning member 40 and the second filter cleaning member 30.

According to the above embodiment, the filter 25 is cleaned both when the projection window 2 is opened and closed by the lens cover 4. Usually, when the user opens the lens cover 4, it is time to start projection, and when the lens cover 4 is closed, it is time to end projection.
That is, since the filter cleaning is performed both when the projection starts and ends, the filter cleaning is performed more frequently than before, and the filter 25 can be prevented from being clogged.

  Further, since the user only has to pick and move the lens cover operating portion 5 of the lens cover 4 to the left and right, the user is not aware of the filter cleaning. For this reason, it is not necessary to determine the degree of filter clogging and to manually remove dust as in the prior art.

Furthermore, since the first filter cleaning member 40 operates in conjunction with the sliding movement of the lens cover 4, it is not necessary to provide an independent drive mechanism as the filter cleaning member. For this reason, it is possible to prevent the projector 100 from being increased in cost.
Furthermore, since the first filter cleaning member 40 is configured to strike the filter 25 from the inside of the projector 100 toward the outside, it can remove even a small amount of dust attached to the filter 25 due to vibration applied to the filter 25. The effect of preventing clogging can be exhibited more.

(Second Embodiment)
Next, a second embodiment of the projector according to the invention will be described.
In addition, description is abbreviate | omitted about the structure same as 1st Embodiment, and suppose that a different structure is demonstrated.

FIG. 4 is a block diagram showing the internal configuration of the projector according to the second embodiment.
The projector 200 of this embodiment further includes a control unit 210, a cover open / close detection unit 220, a fan drive control unit 230, and a cooling fan motor 240.
Note that the cooling fan 27 of the present embodiment can rotate in the direction opposite to the intake rotation that rotates when the outside air is sucked from the intake port 23. That is, the fan can rotate in both directions.

The control unit 210 performs overall control of the operation of the projector 200. The control unit 200 includes a CPU (Central Processing Unit), and includes a ROM (Read Only Memory) and a RAM (Random Access Memory).
The cover opening / closing detection unit 220 detects the opening and closing of the projection window 2 as the lens cover 4 slides, and outputs the detection result to the control unit 210. The cover open / close detection unit 220 is a detection switch such as an open / close switch provided on the lens cover 4 and is configured to be turned on / off in response to the opening / closing.

  The fan drive control unit 230 controls the rotation operation of the cooling fan 27 by driving the fan motor 240 by a drive signal from the control unit 210. Thereby, outside air outside the projector 200 is sucked into the projector 200 through the air inlet 23 and the filter 25. The sucked outside air is introduced by the cooling fan 27 and discharged from the discharge port of the cooling fan 27. The outside air discharged from the cooling fan 27 is blown to a lamp (not shown).

  In the present embodiment, the fan motor 240 is controlled according to the rotation control signal transmitted from the control unit 210 in accordance with the detection signal from the cover opening / closing detection unit 220. In this case, it is rotated in the direction opposite to the rotation direction when the outside air is taken in for the purpose of cooling. That is, the cooling fan 27 is rotated in the reverse direction so that the inside air in the projector 200 is exhausted to the outside (arrow C).

By rotating the cooling fan 27 in the reverse direction, dust attached to the outer surface 25a of the filter 25 is dropped and removed by the exhaust flow as shown in FIG.
The above-described operation is performed not only when the projection window 2 is opened by the lens cover 4 but also when the projection window 2 is closed by sliding the lens cover 4 in the direction opposite to the arrow A.

  As described above, in this embodiment, the cooling fan 27, the control unit 210, the cover opening / closing detection unit 220, the fan drive control unit 230, and the cooling fan motor 240 cooperate to realize a function as a filter cleaning unit.

According to the second embodiment, when the cover opening / closing detection unit 220 detects the opening / closing of the lens cover 4, the cooling fan 27 is temporarily rotated in the exhaust direction, opposite to the intake direction, to the outer surface 25 a of the filter 25. Adhering dust can be removed.
Therefore, as described in the first embodiment, it can be employed when there is no space in the projector where the filter cleaning members 30 and 40 that operate in conjunction with the sliding movement of the lens cover 4 are provided.

1: housing, 2: projection window, 3: lens filter, 4: lens cover, 5: lens cover operation section, 6: opening for lens cover operation section, 7: focus adjustment lever, 8: zoom adjustment lever, 9 : Lens adjustment opening, 10: operation unit, 11: remote control light receiving unit, 12: foot adjustment lever, 20: bottom surface, 23: air inlet, 25: filter, 27: cooling fan, 30: second filter cleaning member , 31: concavo-convex part, 40: first filter cleaning member, 41: extending member, 43, 45: projection part, 50: projection lens part, 100, 200: projector, 210: control part, 220: cover open / close detection part 230: fan drive control unit, 240: cooling fan motor.

Claims (4)

A projector comprising a filter that covers an intake port for taking in outside air, a projection lens, a light beam passage port that allows a light beam emitted from the projection lens to pass therethrough, and an open / close cover that opens and closes the light beam passage port by sliding movement In
A projector further comprising: a filter cleaning unit that cleans the filter at least when the light beam passage opening is open or closed.   The projector according to claim 1, wherein the filter cleaning unit operates in conjunction with a sliding movement of the opening / closing cover. The filter cleaning means includes a first filter cleaning means having a first protrusion and a second protrusion, and an uneven portion in which a recess and a protrusion corresponding to the shape of the first protrusion are repeatedly formed. A second filter cleaning means comprising:
3. The projector according to claim 2, wherein the second protrusion moves up and down on the filter when the first protrusions are alternately fitted in the recesses by the sliding movement. 4. A cover opening / closing detector for detecting opening / closing of the opening / closing cover;
The projector according to claim 1, wherein the filter cleaning unit operates in accordance with a detection signal from the cover open / close detection unit.

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