JP2012058580A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector in which blades are stably held.SOLUTION: The projector includes an exterior housing having the exhaust port, blades 81 that rotationally move to an opening position for opening the exhaust port or a closing position for closing the exhaust port around an rotational shaft as a center, a driving mechanism for operating the blade 81, and a frame member 7 that pivotally supports the blade 81. The blade 81 and the frame member 7 are provided with engagement mechanisms that come into engagement with each other at the closing position. The engagement mechanisms are composed of an engaging section 84D arranged to the blade 81 and an engaged section 710D arranged to the frame member 7.

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, a projector has been proposed in which a plurality of slats (louvers) for opening and closing an exhaust port are provided at an exhaust port formed in an exterior housing (see, for example, Patent Document 1).
In the projector (projection device) of Patent Document 1, a plurality of wing plates are rotatably attached to an exterior housing (outer part), and the exhaust ports can be opened and closed by rotating the plurality of wing plates. The structure (hereinafter referred to as opening / closing structure) is adopted.
Specifically, the opening / closing structure has an elongated flat plate shape and includes an arm that moves linearly along the longitudinal direction. The plurality of slats are each provided with a louver guide shaft parallel to the louver rotation shaft. Each louver guide shaft is inserted into each long hole (arm guide hole) formed in the arm.
Then, by moving the arm linearly along the longitudinal direction, a force is applied to each louver guide shaft at the inner edge of each long hole, and the blades are rotated and moved together.

JP 2003-315910 A

  However, in the projector of Patent Document 1, even if the wing plate is rotated to close the exhaust port, the wing plate swings due to a gap between each long hole formed in the arm and the louver guide shaft, and the exhaust is exhausted. There is a problem that it is difficult to keep the mouth closed.

  An object of the present invention is to provide a projector capable of keeping the exhaust port closed.

  A projector according to the present invention includes an exterior housing having an exhaust port, a blade plate that rotates around an axis of rotation at an open position that opens the exhaust port or a closed position that closes the exhaust port, and a drive mechanism that operates the blade plate A support member that pivotally supports the blade plate, wherein the blade plate and the support member are provided with an engagement structure that engages with each other in the closed position, The engaging portion is formed on the blade, and the engaging portion is formed on the support member.

  In the present invention, when the blade plate is rotated to the closed position, the blade plate and the support member are engaged with each other by the engagement structure. For this reason, the swaying of the blades at the closed position can be prevented, and the exhaust port can be kept closed.

In the projector according to the aspect of the invention, it is preferable that the engagement structure includes the locking portion so that the blade plate and the support member are engaged even in the open position.
Here, even after the blade is rotated to the open position, the blade is swung as in the closed position described above. In this way, when the blades swing, if there is light leaking from the exhaust port (light leakage of light from the light source in the projector), the light leaks due to the swinging of the blades, and this leakage occurs when the projector is used. Flickering may occur due to light fluctuations.
In the present invention, when the blade is rotated to the open position, the blade and the support member are engaged with each other by the engagement structure. For this reason, it is possible to prevent the blades from swinging at the open position. Thus, even when there is light leaking from the exhaust port, it is possible to prevent fluctuation of the light leak and prevent flickering.

In the projector according to the aspect of the invention, it is preferable that the blade plate includes an extension portion extending from the rotation shaft, and the engagement structure is provided on a distal end side of the extension portion.
Here, the blade at the engaging position of the engaging portion and the engaging portion is supported by the support member at the rotating shaft portion (the shaft support portion to the support member) and the engaging structure portion. For this reason, when the distance from the rotating shaft to the engagement structure is short, it is difficult to stably hold the blades.
In the present invention, since the engagement structure is provided on the distal end side of the extending portion separated from the rotation shaft, the blade plate is stably held as compared with the case where the engagement structure is provided at a position close to the rotation shaft. it can.

In the projector according to the aspect of the invention, the blade plate may include an edge portion positioned at an end portion in the vertical direction of the extension portion, and the support member may be opposed to the edge portion with a gap. It is preferable that the engaging portion protrudes from the end edge portion with respect to the flat surface portion, and a protruding length of the engaging portion is smaller than the gap.
In this invention, since the protrusion length of an engaging part is smaller than the clearance gap between an edge part and a plane part, when a blade | wing plate rotationally moves, an engaging part and a plane part do not contact | connect. This eliminates the frictional resistance between the engaging portion and the flat portion when the blade is rotated, and the blade plate is rotated and moved with a smooth and weak force compared to the configuration in which the engaging portion and the flat portion are in contact with each other. Can be made.

In the projector according to the aspect of the invention, the slat may be pivotally supported with play in a direction along the rotation axis, and the locking portion may protrude from the planar portion with respect to the engagement portion, and the engagement portion may be disposed at a tip. The protrusion is configured to have a recessed portion that engages with a joint portion, and the length of the play is the engagement from the protruding end of the engaging portion to the distal end of the locking portion in a state in which the blade is moved to the lower end. It is preferable that it is larger than the distance in the protrusion direction of a part.
Here, when the slats are supported by the support member without play, it is necessary to apply a load to the slats to deform and engage the slats in order to engage the engaging portions with the recesses. is there.
In the present invention, the slats are movable along the rotation axis by play, and the locking part is positioned below the engagement part, so that the slats move downward and play. Is packed. Thereby, when it is going to rotate and move a slat into an engagement position, an engagement part contacts a locking part. However, the length of play in the rotational axis direction of the blade plate is greater than the distance in the protruding direction of the engaging portion from the protruding end of the engaging portion to the tip of the locking portion when the blade plate is moved downward. It is configured. Accordingly, the engaging portion can be engaged with the concave portion at the tip of the locking portion by moving the blade plate upward. Therefore, the engaging portion can be engaged without applying a load to the blades and causing the blades to be deformed.

In the projector according to the aspect of the invention, the blade may be pivotally supported with play in a direction along the rotation axis, and the locking portion may protrude from the flat portion to the engagement portion, and It is comprised by the protrusion shape which has the recessed part engaged with the said engaging part, and the said clearance gap is a clearance gap between the said edge part and the said plane part in the state which the said blade plate moved to the lower end, It is preferable that the length is smaller than the sum of the protruding length and the length from the protruding end of the engaging portion to the planar portion at the engaging position of the engaging portion and the locking portion.
In the present invention, the gap between the edge portion and the flat surface portion in a state where the blades are moved downward is the protrusion length of the engaging portion and the length from the protruding end of the engaging portion to the flat surface portion in the engaging position. It is smaller than the added length. For this reason, in the engagement position, the vane does not move completely downward. In other words, at the engaging position, the engaging portion is pressed against the concave portion by the dead weight of the blade plate and engages, so that the engagement state can be kept good without applying a load to the blade plate.

In the projector according to the aspect of the invention, the engaging portion may be provided on each of the upper and lower ends of the end edge portion, and the locking portion may be provided corresponding to each of the engaging portions, between the protruding ends of the engaging portions. Is preferably smaller than the length between the tips of the locking portions.
Here, as a projector, installation in a normal position (position placed on the installation surface of a desk, etc.) and a suspended position (an attitude fixed to the ceiling or the like so that the vertical position is opposite to the normal position) ) Is known to be compatible with the installation at).
In the present invention, in a posture in which the lower end of the end edge portion is located below the upper end (for example, a normal placement posture), since the blade is pivotally supported with play, the lower side is caused by the weight of the blade. The slats move to For this reason, in the engagement position, the slats of the blades are prevented by the engagement structure on the lower end side. Moreover, the length between the protrusions of each engaging part is smaller than the length between the front-end | tips of each latching | locking part. For this reason, in the engaging structure on the upper end side, a gap is generated between the engaging portion and the locking portion.
In a posture in which the lower end of the edge portion is positioned above the upper end (for example, a ceiling suspension posture), the blade structure is prevented from swinging by the upper end side engaging structure, and the lower end side engaging structure is engaged. A gap is generated between the joining portion and the locking portion.
Therefore, since the swaying of the slats can be prevented by the engagement structure on either the upper end side or the lower end side, it is not so large as compared with the case where the swaying of the slats is prevented by the engagement structure on both ends. The engagement portion can be engaged and released by force.

In the projector according to the aspect of the invention, it is preferable that the blade has a pair of extending portions extending in opposite directions from the rotation shaft, and has a rotationally symmetric shape with the rotation shaft as a center.
Here, when there is only one extending portion extending from the rotating shaft, the center of gravity of the blade plate is a position deviated from the rotating shaft (a position separated in the extending direction of the extending portion). And when such a slat is adopted, for example, when the attitude of the projector is changed in order to change the projection angle (projection position) of the projector, the center of gravity is on the tip side of the slat. There is a possibility that the vane plate moves easily and the rotation position of the vane plate is shifted from a desired position.
According to the present invention, the vane plate has a rotationally symmetric shape with the rotation axis as the center, and is constituted by a pair of extending portions that extend in opposite directions from the rotation axis. Located on the axis of rotation. For this reason, even if it is a case where the attitude | position of a projector is changed according to a projection angle etc., there is no possibility that the rotation position of a blade may shift | deviate from a desired position.

In the projector according to the aspect of the invention, it is preferable that the locking portion has an inclined surface at a portion where the engaging portion contacts.
In this invention, since the part which an engaging part contacts is an inclined surface, when a slat | blade rotationally moves to a closed position, the load added to a slat can be made constant, and a slat | plate can be rotated smoothly.

In the projector according to the aspect of the invention, it is preferable that the concave portion is formed so as to intersect a locus of the engagement portion when the blade plate rotates.
Here, when the concave portion is formed at one point on the locus, the blade plate and the support member must be precisely manufactured so that the engaging portion engages with the concave portion at the engagement position.
In the present invention, since the concave portion is formed in a groove shape that intersects with the locus of the engaging portion when the blade plate rotates, the engagement position can be obtained without precisely manufacturing the blade plate and the support member. Since the engaging portion can be engaged with the recess, the projector can be easily manufactured.

1 is a perspective view showing an external configuration of a projector according to an embodiment of the invention. FIG. 2 is a plan view showing an internal configuration of the projector in the embodiment. The perspective view which shows the structure of the shutter apparatus in the said embodiment. The disassembled perspective view which shows the structure of the shutter apparatus in the said embodiment. The perspective view which shows the structure of the slat in the said embodiment. The top view which shows operation | movement of the blade board and cam plate in the said embodiment. The perspective view which expanded the blade board in the said embodiment partially. The perspective view which expanded the lower edge part in the said embodiment partially. The schematic diagram explaining the length of the engagement structure in the said embodiment. The schematic diagram explaining the length of the engagement structure in the said embodiment. The figure explaining operation | movement of the shutter apparatus in the said embodiment. The figure explaining operation | movement of the shutter apparatus in the said embodiment. The figure explaining operation | movement of the shutter apparatus in the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[External configuration of the projector]
FIG. 1 is a diagram showing an external configuration of the projector 1. Specifically, FIG. 1 is a diagram showing the projector 1 installed in a normal posture (posture placed on the installation surface of a desk or the like).
Note that the projector 1 supports installation in this normal position and installation in a ceiling position (an attitude fixed to the ceiling or the like so that the vertical position is opposite to the normal position).
In the following, in the projector 1, the projection side (side on which the projection lens 3C is disposed) is referred to as “front surface”, and the opposite side is referred to as “back surface”. Further, the upper (top surface side) and the lower (bottom surface side) in FIG. 1 are respectively referred to as “upper” and “lower”. Further, the left and right when the projector 1 is viewed from the front are defined as “left” and “right”, respectively.

The projector 1 projects an image and displays a projected image on a screen (not shown).
As shown in FIG. 1, the projector 1 includes an exterior housing 2 that forms an exterior of the projector 1.
The exterior housing 2 accommodates each member constituting the projector 1, and is configured in a substantially rectangular parallelepiped shape as shown in FIG. That is, as shown in FIG. 1, the exterior housing 2 includes a front wall portion 2A located on the front side, a rear wall portion 2B located on the back side, and a left wall portion located on the left and right as viewed from the front side. 2C and the right wall 2D, and a top surface 2E and a bottom surface 2F connected to the walls 2A to 2D.
The left wall 2C is provided with an exhaust port 21 for discharging the air inside the projector 1 to the outside.

[Internal configuration of projector]
FIG. 2 is a plan view schematically showing the internal configuration of the projector 1.
As shown in FIG. 2, an optical unit 3, a power supply unit 4, an exhaust fan 5, and a shutter device 6 are disposed inside the exterior housing 2.
As shown in FIG. 2, the optical unit 3 has a substantially L shape in plan view that extends from the left wall 2C side along the rear wall 2B and bends toward the front wall 2A.
Since the optical unit 3 is used in various general projectors, a specific description is omitted, but as shown in FIG. 2, the light source device 3A having a light source lamp and the light source device 3A are emitted. A light modulation device (not shown) such as a liquid crystal panel for modulating the light beam, and a projection lens 3C for projecting the light beam modulated by the light modulation device.

As shown in FIG. 2, the power supply unit 4 is disposed on the inner side (between the front wall portion 2 </ b> A and the light source device 3 </ b> A) of the optical unit 3 in a substantially L shape in plan view. Supply.
As shown in FIG. 2, the exhaust fan 5 is disposed in the vicinity of the light source device 3 </ b> A, sucks air in the vicinity of the light source device 3 </ b> A, and discharges it to the outside of the exterior housing 2 through the exhaust port 21.

[Configuration of shutter device]
3 and 4 are diagrams showing the configuration of the shutter device 6. Specifically, FIG. 3 is a perspective view of the shutter device 6 as viewed from the front left side, and FIG. 4 is an exploded perspective view thereof.
The shutter device 6 is for opening and closing the exhaust port 21.
As shown in FIGS. 3 and 4, the shutter device 6 includes a frame member 7 as a support member, a louver 8, and a drive mechanism 9.

[Configuration of frame member]
The frame member 7 integrally assembles the members 8, 9, etc. constituting the shutter device 6, and is attached inside the exterior housing 2 so as to face the exhaust port 21.
As shown in FIG. 3, the frame member 7 has an upper edge portion 71 and a lower edge portion 72 that are positioned above and below, and a front edge portion 73 and a rear edge portion 74 that are positioned on the front surface side and the back surface side, respectively. However, it is formed in a rectangular frame shape surrounding the exhaust port 21 when viewed from the left wall 2C side.
As shown in FIG. 4, the frame member 7 is configured such that a part of the upper edge portion 71 (hereinafter referred to as the first frame member 7A) is detachable from other parts (hereinafter referred to as the second frame member 7B). Has been.

As shown in FIG. 4, the first frame member 7A is formed in a rectangular plate shape extending in the front-rear direction (direction from the front side to the back side).
The first frame member 7A is formed with a guide groove 75 that is recessed downward and extends along the longitudinal direction of the first frame member 7A.
In the bottom portion of the guide groove 75, first circular holes 76 are formed at equal intervals along the longitudinal direction of the first frame member 7A.
In addition, in the vicinity of each first circular hole 76, a regulation hole 77 extending in an arc shape with each first circular hole 76 as a center is formed.

In the second frame member 7 </ b> B, as shown in FIG. 4, second circular holes 78 are formed in the lower edge portion 72 at positions facing the first circular holes 76.
Further, in the second frame member 7B, a partition portion 79 is formed at a substantially central portion in the front-rear direction so as to straddle the light source device 3A side and the power supply unit 4 side across the upper edge portion 71 and the lower edge portion 72. .

[Configuration of louver]
The louver 8 is rotatably supported between the upper edge portion 71 and the lower edge portion 72, and is in an open position (see FIG. 6A) for opening the opening portion (exhaust port 21) of the frame member 7 or closed. Rotate to the closed position (see FIG. 6B).
The louver 8 includes a plurality of vanes 81 as shown in FIGS.

FIG. 5 is a perspective view showing the configuration of the blade 81.
As shown in FIG. 5, the blade 81 includes a pair of extending portions 81 </ b> A and 81 </ b> B that extend in directions opposite to each other from the rotation axis A that is the center of rotation of the blade 81, and whose tip portions are bent in a crank shape. . The extending portions 81A and 81B have a rotationally symmetric shape with the rotational axis A as the center.
As shown in FIG. 5, shafts 82 projecting along the rotation axis A are formed at the upper and lower ends of the blade plate 81, respectively.
The blade 81 is configured to be rotatable by the shaft 82 being pivotally supported by the circular holes 76 and 78 of the upper edge 71 and the lower edge 72, respectively.

Further, as shown in FIG. 5, the vane plate 81 is disposed at the upper end at a position shifted in the out-of-plane direction from a position close to the shaft portion 82 of the one extending portion 81 </ b> A and parallel to the shaft portion 82. A cam pin 83 is formed as a protruding portion that protrudes. The cam pin 83 is formed in a cylindrical shape. Note that the axis B is the central axis of the cam pin 83.
The cam pin 83 is inserted into the restriction hole 77 and protrudes upward from the upper edge 71 in a state where the blade 81 is pivotally supported between the upper edge 71 and the lower edge 72.
The blade plate 81 and the frame member 7 described above are provided with an engaging structure that engages with each other. This engagement structure will be described in detail later.

[Configuration of drive mechanism]
The drive mechanism 9 operates the louver 8 and includes a cam plate 91 as a moving member, an elastic member 92A, and a solenoid 92B, as shown in FIG. 3 or FIG.

First, the cam plate 91 will be described.
The cam plate 91 engages with each cam pin 83 of the plurality of blade plates 81 and applies a force to each cam pin 83 to collectively rotate the plurality of blade plates 81 (louvers 8) to the open position or the closed position. Let
As shown in FIG. 4, the cam plate 91 is formed in a rectangular plate shape extending in the front-rear direction. The cam plate 91 is loosely fitted in the guide groove 75 of the first frame member 7A and is configured to be linearly movable in the front-rear direction.

As shown in FIG. 3 or FIG. 4, long holes 91 </ b> A are formed in the cam plate 91 at equal intervals along the longitudinal direction of the cam plate 91 (intervals between the plurality of blade plates 81).
These long holes 91 </ b> A are formed so as to extend in the left-right direction (horizontal direction) orthogonal to the moving direction of the cam plate 91.
A cam pin 83 protruding upward from the upper edge 71 is inserted into the long hole 91 </ b> A in a state where the cam plate 91 is loosely fitted in the guide groove 75.

  FIG. 6 is a plan view for explaining the operation of the blade plate 81 and the cam plate 91. Specifically, FIG. 6 is a partial plan view of the blade plate 81 and the cam plate 91 as viewed from above. 6A shows a state in which the louver 8 is in the open position, and FIG. 6B shows a state in which the louver 8 is in the closed position. In FIG. 6, the right side corresponds to the front side of the projector 1, and the left side corresponds to the back side of the projector 1.

The louver 8 rotates from the open position to the closed position as follows.
That is, as shown in FIG. 6A, the cam plate 91 is located on the back side in the open position. Here, when the cam plate 91 is moved to the front side, the cam pin 83 is pushed to the front side by the inner edge of the long hole 91A, and each blade 81 is rotated and moved together in conjunction with the movement of the cam plate 91 ( In FIG. 6, the louver 8 is rotated counterclockwise), and the louver 8 is in the closed position (FIG. 6B).
Further, by operating the cam plate 91 in the reverse direction, the louver 8 is rotationally moved from the closed position to the open position.

Next, the elastic member 92A and the solenoid 92B that serve as power for moving the cam plate 91 linearly will be described.
The elastic member 92A is a member that biases the cam plate 91 forward.
In the present embodiment, the elastic member 92A is constituted by a tension coil spring, and is attached between the front end portion of the cam plate 91 and the frame member 7 as shown in FIG.
The solenoid 92B operates the cam plate 91.
The solenoid 92B is configured by a self-holding solenoid, and performs a suction operation, a suction operation, and a return operation under the control of a control device (not shown).
In the suction operation, the movable iron core 93 (FIGS. 3 and 4) moves to the back side, and the cam plate 91 also moves to the back side accordingly, and the louver 8 rotates to the open position.
In the suction operation, the movable iron core 93 moved to the back side is held, and accordingly, the louver 8 is maintained in the state positioned at the open position.
In the return operation, the movable iron core 93 moves to the front side, the cam plate 91 also moves to the front side accordingly, and the louver 8 rotates to the closed position.

[Engagement structure of blade and frame member]
FIG. 7 is a partially enlarged perspective view of the blade plate 81. Specifically, FIG. 7 is a perspective view of the lower end of the blade plate 81 as viewed obliquely from below.
In the following, the configuration of the lower end of the blade plate 81 will be described as an example. However, as shown in FIG. 5, the upper end has the same configuration.

As shown in FIG. 7, the blade 81 has an end edge portion 811 </ b> D on the lower end side located at the end portion in the vertical direction of the extending portion 81 </ b> B. The shaft portion 82 described above protrudes from the end edge portion 811D via the seat portion 812D.
The seat portion 812D has a cylindrical shape that is coaxial with the rotation axis A and has a diameter larger than that of the shaft portion 82, protrudes below the blade plate 81, and has an annular seat surface 813D that faces the lower edge portion 72. Have.

  The end edge portion 811D is provided with an engaging portion 84D that protrudes in a direction from the end edge portion 811D toward the lower edge portion 72. The engaging portion 84D is provided on the distal end side of the extending portion 81B in the end edge portion 811D. As shown in FIG. 7, the engaging portion 84D has a hemispherical end.

  FIG. 8 is a perspective view in which the lower edge portion 72 is partially enlarged. Specifically, FIG. 8 is a perspective view of the shutter device 6 as viewed from the left side of the front surface, as in FIG. In the following, the configuration of the lower edge portion 72 will be described as an example, but the upper edge portion 71 has the same configuration.

The lower edge portion 72 has a flat surface portion 72 </ b> D that faces the upper edge portion 71. The flat surface portion 72D is provided with a seat portion 701D and a first locking portion 710D and a second locking portion 720D as locking portions.
The seat portion 701 </ b> D has a ring-shaped seat surface 702 </ b> D that protrudes from the flat surface portion 72 </ b> D toward the upper edge portion 71 along the periphery of the second circular hole 78 and faces the upper edge portion 71.

The first locking portion 710D forms an engagement structure together with the engagement portion 84D. The first locking portion 710D has a recess 711D and an inclined surface 712D, and has a protruding shape that protrudes from the flat surface portion 72D toward the upper edge portion 71. The first locking portion 710D locks the blade plate 81 in the closed position (engagement position) where the engaging portion 84D engages with the recess 711D of the first locking portion 710D, and the blade plate 81 swings. This is for prevention, and is provided at a position facing the engaging portion 84D in the closed position.
The recess 711D is a V-groove that engages with the engaging portion 84D, and is formed at the tip of the first locking portion 710D. The recess 711D is provided so as to intersect the locus of the engaging portion 84D when the blade 81 is rotationally moved. When the blade 81 is in the closed position, the engaging portion 84D is engaged with the recess 711D.

  The inclined surface 712D is provided at a portion where the engaging portion 84D contacts when the blade 81 rotates, and is configured by a surface inclined from the recess 711D toward the flat portion 72D along the locus of the engaging portion 84D. ing. The inclination angle of the inclined surface 712D with respect to the flat surface portion 72D can be appropriately set according to the driving force for operating the cam plate 91. Specifically, if the inclination angle is relaxed, the blade plate 81 can be rotated and moved even if the driving force is small.

  The second locking portion 720D has the same shape as the first locking portion 710D, and constitutes an engagement structure together with the engagement portion 84D. The second locking portion 720D locks the blade plate 81 in the open position (engagement position) where the engagement portion 84D engages with the recess 711D of the second locking portion 720D. Is provided at a position facing the engaging portion 84D in the open position.

  9 and 10 are schematic views for explaining the length of the engagement structure. Specifically, FIG. 9 shows the length when the blade plate 81 is in an intermediate position between the open position and the closed position (hereinafter, abbreviated as the intermediate position), and FIG. 10 shows the blade plate 81 in the closed position. The length in the case is shown. In the following, the length of the engagement structure in the closed position on the lower end side will be described with reference to FIG. 9, but the engagement structure on the upper end side and the engagement structure in the open position on the upper and lower ends side will be described. Is also configured with a similar length.

As shown in FIG. 9, the engaging portion 84D protrudes from the end edge portion 811D by a protruding length L1 with respect to the flat surface portion 72D.
Here, the blades 81 are pivotally supported with play along the rotation axis A (see FIGS. 4 and 5). Therefore, the wing plate 81 can move along the rotation axis A. As shown in FIG. 9, at the intermediate position, the wing plate 81 moves downward by its own weight, and the seat surface 702 </ b> D of the lower edge 72 and the wing plate 81 are moved. The seating surface 813D comes into contact. In this state, a gap L2 is formed between the edge portion 811D and the flat portion 72D.
The gap L2 is configured to be larger than the protruding length L1 of the engaging portion 84D (L1 <L2). That is, as shown in FIG. 9, when the blade plate 81 is in the intermediate position, the engaging portion 84D is not in contact with the flat portion 72D.

Further, the gap L2 is obtained by adding the protruding length L1 of the engaging portion 84D and the length L3 from the protruding end of the engaging portion 84D to the flat portion 72D at the engaging position (closed position) shown in FIG. It is smaller than the length (L1 + L3> L2). That is, as shown in FIG. 10, the blade plate 81 does not completely move downward, and the seat surface 702 </ b> D of the lower edge portion 72 and the seat surface 813 </ b> D of the blade plate 81 are separated from each other.
Furthermore, as shown in FIG. 10, the length L4 between the protrusions of the engaging portions 84D and 84U is configured to be smaller than the length L5 between the tips of the first locking portions 710D and 710U (L4 <L5). Yes. For this reason, as shown in FIG. 10, in the closed position, a gap is formed between the engaging portion 84U on the upper end side and the first locking portion 710U on the upper end side.
Further, as shown in FIG. 9, the upper side of the blade plate 81 at an intermediate position between the open position and the closed position where the play length in the rotation axis A direction (the distance that the blade plate 81 can move in the rotation axis A direction) is obtained. The distance L6 between the seating surface 813D and the seating surface 702D is larger than the distance L7 in the projecting direction of the engaging portion 84D from the protruding end of the engaging portion 84D to the tip of the first locking portion 710D at the intermediate position (L6> L7). )It is configured.

[Operation of shutter device]
11 to 13 are diagrams for explaining the operation of the shutter device 6. Specifically, FIG. 11 shows a state where the blade plate 81 is in the open position, FIG. 12 shows a state where the blade plate 81 is in the intermediate position, and FIG. 13 shows a state where the blade plate 81 is in the closed position. Show.

In the case of the open position, as shown in FIG. 11, the engaging portion 84D engages with the concave portion 711D of the second locking portion 720D, and the blade plate 81 is locked by the second locking portion 720D. When the solenoid 92B is returned from this state and the blade plate 81 is rotated toward the closed position, the blade plate 81 moves upward due to play in the direction of the rotation axis A, and the engaging portion 84D 2 Get over the tip of the locking portion 720D and come out of the recess 711D.
The engaging portion 84D moves down the inclined surface 712D of the second locking portion 720D, and the blade 81 moves to the intermediate position as shown in FIG.
Further, when the blade 81 is rotated toward the closed position, the engaging portion 84D starts to climb the inclined surface 712D of the first locking portion 710D. At this time, the blade 81 moves upward due to play in the direction of the rotation axis A. When the engaging portion 84D has climbed the inclined surface 712D, it engages with the recess 711D of the first locking portion 710D, and the blade 81 is locked to the first locking portion 710D.
As described above, the upper end side of the blade plate 81 has the same engagement structure as the lower end side. For this reason, the projector 1 operates in the same manner when the projector 1 is turned upside down and installed in the ceiling position.

According to this embodiment described above, the following effects are obtained.
When the blade 81 is rotationally moved to the closed position, the blade 81 and the lower edge 72 are engaged with each other by the engagement structure (the engaging portion 84D and the concave portion 711D of the first locking portion 710D). For this reason, it is possible to prevent the blade 81 from swinging in the closed position, and to keep the exhaust port 21 closed.

  Further, even when the blade 81 is rotated to the open position, the blade 81 and the lower edge 72 are mutually connected by the same engagement structure (engagement portion 84D and recess 711D of the second locking portion 720D). Engage. For this reason, swinging of the blade plate 81 at the open position can be prevented. Thus, even when there is light leaking from the exhaust port 21, it is possible to prevent fluctuation of the light leak and prevent flickering.

Furthermore, since the engagement structure is provided on the distal end side of the extending portion 81B that is separated from the rotation axis A, the blade plate 81 is stabilized as compared with the case where the engagement structure is provided at a position close to the rotation axis A. Can be held.
Moreover, since the engaging part 84D and the flat part 72D do not contact when the blade 81 is rotated, the blade 81 can be rotated and moved with a smooth and weak force.

  Further, the play length L6 of the blade 81 in the direction of the rotation axis A is greater than the distance L7 in the protruding direction of the engaging portion 84D from the protruding end of the engaging portion 84D at the intermediate position to the tip of the first locking portion 710D. It is composed largely. For this reason, without deforming the blade plate 81, the blade plate 81 can be moved upward to engage the engaging portion 84D with the concave portion 711D at the tip of the first locking portion 710D.

  Further, the gap L2 is smaller than the length obtained by adding the protruding length L1 of the engaging portion 84D and the length L3 from the protruding end of the engaging portion 84D to the flat surface portion 72D at the closed position. For this reason, in the closed position, the blade plate 81 does not move completely downward, and the seat surface 702D of the lower edge portion 72 and the seat surface 813D of the blade plate 81 are separated. That is, in the closed position, the engaging portion 84D is pressed and engaged with the concave portion 711D by the dead weight of the blade plate 81, so that the engagement state can be satisfactorily maintained without applying a load to the blade plate 81.

Further, in the normal posture, the blade 81 and the lower edge portion 72 have play, so that the blade 81 moves downward due to its own weight. For this reason, in the closed position, the slats of the blade plate 81 are prevented by the engagement structure (engagement portion 84D and first locking portion 710D) on the lower end side. Further, the length L4 between the protruding ends of the engaging portions 84D and 84U is smaller than the length L5 between the tips of the first locking portions 710D and 710U. For this reason, in the engagement structure on the upper end side (the engaging portion 84U and the first locking portion 710U), a gap is generated between the engaging portion 84U and the first locking portion 710U.
In the ceiling-suspended posture, the swinging of the blade plate 81 is prevented by the engaging portion 84U and the first locking portion 710U, and a gap is generated between the engaging portion 84D and the first locking portion 710D.
Therefore, the swinging movement of the blade plate 81 can be prevented by either one of the engagement structures, so that the engagement portion is not so large compared with the case where the swinging movement of the blade plate 81 is prevented by both engagement structures. 84D or engagement portion 84U can be engaged and released.

  In the closed position, the engaging portion 84D is pressed and engaged with the recess 711D by the dead weight of the blade 81. For this reason, the engagement state can be maintained satisfactorily without applying a load to the blades 81.

Further, when the projector 1 is installed in the normal position, the blade plate 81 moves downward by its own weight, and in the closed position, the blade plate 81 is swung by the engaging portion 84D and the first locking portion 710D. Is prevented. Further, since the length L4 between the protruding ends of the engaging portions 84D and 84U is smaller than the length L5 between the distal ends of the first locking portions 710D and 710U, the engaging portion 84U and the first locking portion 710U are separated. A gap is created.
In addition, when installed in the ceiling hanging posture, the swinging of the blade plate 81 is prevented by the engaging portion 84U and the first locking portion 710U, and a gap is generated between the engaging portion 84D and the first locking portion 710D. .
Therefore, since the swinging movement of the blade plate 81 can be prevented by any one of the engagement structures on both ends of the rotating shaft A, compared with the case where the swinging movement of the blades is prevented by each engagement structure on both ends. Thus, the engaging portions 84D and 84U can be engaged and released with a force that is not so large.

  Further, since the blade plate 81 is constituted by the pair of extending portions 81A and 81B, the center of gravity of the blade plate 81 is located on the rotation axis A. For this reason, even if it is a case where the attitude | position of the projector 1 is changed according to a projection angle etc., there is no possibility that the rotation position of the blade board 81 may shift | deviate from a desired position.

Further, in the first locking portion 710D, the portion with which the engaging portion 84D is in contact is the inclined surface 712D, so that the fluctuation of the load applied to the blade plate 81 is reduced when the blade plate 81 rotates to the closed position. The blade 81 can be rotated and moved smoothly.
Further, the recess 711D is formed in a groove shape that intersects with the locus of the engaging portion 84D when the blade 81 is rotationally moved, so that the blade plate 81 and the frame member 7 need not be precisely manufactured. Since the engaging portion 84D can be engaged with the concave portion 711D in the closed position, the projector 1 can be easily manufactured.
Further, since the end portion of the engaging portion 84D is hemispherical, the resistance to the inclined surface 712D can be reduced and the blade plate 81 can be smoothly rotated.
While the effects at the closed position have been described above, the same effects can be achieved at the open position.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above-described embodiment, the configuration in which the protruding engaging portion 84D and the concave portion 711D that is a V groove are engaged is illustrated. However, the engaging structure of the engaging portion 84D and the locking portions 710D and 720D is described here. Not exclusively. For example, the recess 711D may be a U-groove or the like. Moreover, it is good also considering the recessed part 711D as a protruding shape, and making the front-end | tip part of engaging part 84D into the recessed shape into which this protruding shape fits.
In the above-described embodiment, the engaging portions 84D and 84U are provided on the extending portion 81B side of the blade plate 81, but this is not restrictive. For example, the engaging portions 84D and 84U may be provided on both the extending portions 81A and 81B, respectively, one of the engaging portions 84D and 84U is provided on the extending portion 81A, and the other is provided on the extending portion 81B. May be. In these cases, the first locking portions 710D and 710U, the second locking portion 720D, and the like may be appropriately provided at positions corresponding to the closed position and the open position of the engaging portions 84D and 84U, respectively.

  In the above embodiment, the cam plate 91, the elastic member 92A, and the solenoid 92B are used as the drive mechanism 9, but the drive mechanism 9 is not limited to this. For example, in the above-described embodiment, the cam plate 91 is operated by the solenoid 92B, but is not limited thereto, and may be operated by a motor or the like, or may be manually operated.

In the embodiment, the exhaust port 21 is formed in the left wall portion 2C of the exterior housing 2, but it may be formed in the front wall portion 2A or the like. In the case of forming on the front wall portion 2A, the image light projected from the projection lens 3C fluctuates by the exhaust heat by restricting the rotational movement of the blade 81 in a direction in which the exhaust moves away from the projection lens 3C in the open position. Can be prevented.
In the embodiment, the case where the number of the blade plates 81 constituting the louver 8 is eight is illustrated, but the number of the blade plates 81 is not particularly limited, and is appropriately set according to the size of the exhaust port 21 and the like. do it.

  INDUSTRIAL APPLICABILITY Since the opening / closing state of the exhaust port can be switched efficiently, the present invention can be used for a projector having an exhaust port used for a presentation or a home theater.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing, 21 ... Exhaust port, 7 ... Frame member (support member), 9 ... Drive mechanism, 72D ... Planar part, 81 ... Blades, 81A, 81B... Extended portions (a pair of extended portions), 84D, 84U... Engaging portions, 710D, 710U... First locking portions (locking portions), 711D, 711U ···, recess, 712D · · · inclined surface, 720D ··· second locking portion (locking portion), 811D ··· edge, A · · · rotation axis.

Claims (10)

An exterior housing having an exhaust port, a blade plate that rotates around an axis of rotation to an open position that opens the exhaust port or a closed position that closes the exhaust port, a drive mechanism that operates the blade plate, and a shaft that rotates the blade plate A projector provided with a supporting member to support,
The blade plate and the support member are provided with engagement structures that engage with each other in the closed position,
The engagement structure is
An engaging portion formed on the blade,
A projector comprising: a locking portion formed on the support member. The projector according to claim 1.
The engagement structure is
The projector comprising the locking portion so that the blade plate and the support member engage even in the open position. The projector according to claim 1 or 2,
The blades are
An extending portion extending from the rotating shaft;
The engagement structure is
The projector is provided on a front end side of the extension portion. The projector according to any one of claims 1 to 3,
The blades are
Comprising an end edge located at the end of the extension in the vertical direction;
The support member is
A flat portion facing the end edge with a gap;
The engaging portion is
Projecting from the edge to the planar portion,
The protruding length of the engaging portion is:
The projector is smaller than the gap. The projector according to claim 4,
The blades are
It is pivotally supported with play in the direction along the rotation axis,
The locking portion is
It protrudes with respect to the engaging portion from the flat portion, and is configured with a protruding shape having a concave portion that engages with the engaging portion at the tip.
The length of the play is
The projector is characterized in that it is larger than the distance in the protruding direction of the engaging portion from the protruding end of the engaging portion to the tip of the locking portion in a state where the blade is moved to the lower end. The projector according to claim 4,
The blades are
It is pivotally supported with play in the direction along the rotation axis,
The locking portion is
It protrudes with respect to the engaging portion from the flat portion, and is configured with a protruding shape having a concave portion that engages with the engaging portion at the tip.
The gap is
It is a gap between the edge portion and the plane portion in a state where the blade is moved to the lower end,
The projector is smaller than a length obtained by adding the protruding length of the engaging portion and the length from the protruding end of the engaging portion to the flat portion at the engaging position of the engaging portion and the locking portion. . The projector according to claim 6,
The engaging portion is
Provided at the upper and lower ends of the edge part,
The locking portion is
Provided corresponding to each of the engaging portions,
The length between the protrusions of the engaging portion is:
The projector is smaller than the length between the tips of the locking portions. The projector according to any one of claims 1 to 7,
The blades are
A projector comprising a pair of extending portions extending in opposite directions from the rotating shaft, and having a rotationally symmetric shape about the rotating shaft. The projector according to claim 5, wherein
The locking portion is
A projector having an inclined surface at a portion where the engaging portion contacts. The projector according to claim 5.
The recess is
The projector is characterized in that it is formed in a groove shape that intersects with the locus of the engaging portion when the blade plate rotates.

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