JP2007294603A - Electric equipment and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electric equipment and a projector such that attachment/detachment of pluralities of air filters and covers can be detected with a simpler structure. <P>SOLUTION: Provided are one rotary switch 13 detecting the plurality of air filters 11 and 11, and covers 10a and 10b being attached/detached, and arm parts 101a and 101b are provided to portions of the plurality of covers 10a and 10b respectively. When the plurality of covers 10a and 10b are attached, the arm parts 101a and 101b overlap and the rotary switch 13 detects the height of the overlapping arm parts 101a and 101b. A control section 7 operates/stops a cooling fan according to the detection result of the rotary switch 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric device and a projector including a fan and an air filter for sucking outside air.

  In recent years, electrical equipment such as projectors, for which demand is increasing, is designed to prevent overheating inside the electrical equipment due to the heat generated by the light source lamp, and to prevent malfunction of the parts. Cool down. At this time, an air filter and a cover for holding the air filter are provided to prevent dirt from outside air from entering the electric device. When used in an environment where the dirt of outside air such as cigarette smoke and dust is severe, it is necessary to periodically clean or replace the air filter in order to prevent overheating due to clogging of the air filter.

  However, in order to facilitate the cleaning or replacement of the air filter, many electrical devices are configured such that the air filter can be removed at the same time by removing the cover. Therefore, when the cover is removed with the power on, or when the power is turned on with the cover removed, a large amount of dirty outside air is sucked into the electrical equipment without being filtered by the operation of the cooling fan. There was a problem that.

In view of this, a projector that prevents the occurrence of the above problem by providing a detection switch that detects whether the cover is attached or detached has been proposed (for example, see Patent Document 1).
JP 2000-261740 A

  However, in the projector of Patent Document 1, although the attachment / detachment state of the cover can be detected, the attachment / detachment state of the air filter is detected from the electrical connection between the cover and the detection switch. It is necessary to provide detection switches for several minutes, and there is a risk that the wiring becomes complicated, and that the wiring is disconnected and poorly connected.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a simple configuration and low cost by configuring so as to detect attachment and detachment of a plurality of covers by a single sensor. Another object of the present invention is to provide an electric device and a projector that can detect attachment and detachment of a plurality of covers.

  Another object of the present invention is to provide each of the plurality of covers with an arm portion, and to provide a protruding member or a moving member at the base end portion or the distal end portion of each arm portion. It is an object of the present invention to provide an electric device having a simple configuration that can detect attachment or detachment of a cover from the overlapping height and does not require a mechanical or electrical connection with a sensor for each cover.

  Another object of the present invention is to provide a housing portion for housing each arm portion of a plurality of covers, by recessing the outside of the surface adjacent to the surface on which the cover is mounted, so that all the arm portions are accommodated in the housing portion. It is an object of the present invention to provide an electrical device that can be accommodated in a housing and has an exterior with an excellent appearance without deteriorating the appearance of the device.

Another object of the present invention is to provide a screw retaining portion for screwing the arm portions of a plurality of covers into the housing portion with screws, and to insert a screw insertion hole in each arm portion. By providing each, each arm part is screwed in the accommodating part with a screw, and it is providing the electric equipment which can prevent generating a shift | offset | difference when the projection member and moving member of each arm part overlap.

  Another object of the present invention is to provide a support tube for movably supporting the moving member on the arm portion including the moving member, and the protruding member of the other arm portion is inserted into the supporting tube. An object of the present invention is to provide an electric device that can reliably ensure the overlap between the protruding member and the moving member by guiding the moving member to make contact.

  Another object of the present invention is to form a component by integrally forming a hooking means for hooking a plurality of arm portions in the housing portion and any one arm portion of each arm portion. An object of the present invention is to provide an electric device that can reduce the number of points and assembly man-hours and reduce the manufacturing cost.

  Another object of the present invention is to make it possible to learn the assembly order of a plurality of covers in the mounting and dismounting operations of the covers by making each arm part and each projecting member of the plurality of covers have the same shape. An object of the present invention is to provide an electric device that can be eliminated and can be used by a user.

  An electrical device according to the present invention includes a fan that sucks outside air into the housing, an air filter that filters the outside air sucked into the housing, a plurality of covers that are attached to the housing so as to cover the air filter, and a cover A single sensor detects attachment / detachment of a plurality of covers in an electric device comprising a sensor for detecting attachment / detachment of the fan and a control unit for operating / stopping the fan according to the attachment / detachment detected by the sensor. It is comprised so that it may carry out.

  In the present invention, one sensor is provided to detect the attachment and detachment of a plurality of covers. When a plurality of covers are attached, the sensor sends an electrical signal to the control unit.

  In the electrical device according to the present invention, the cover includes a rectangular frame, and when the cover is mounted, an arm portion extending in a direction perpendicular to the surface facing the housing is provided at one end of the frame. A projecting member that stands upright with respect to the arm portion or a moving member that moves in a direction perpendicular to the arm portion, and a plurality of covers In mounting, the protruding member or the moving member is configured to overlap.

  In the present invention, when a plurality of covers are mounted, the sensor detects the height of the overlapping protruding member and moving member, and sends the detection result as an electrical signal to the control unit.

  The electrical device according to the present invention is characterized in that a housing portion that houses each arm portion of the plurality of covers is recessed outside the surface adjacent to the surface on which the cover is mounted.

  In the present invention, when mounting a plurality of covers, each arm portion is accommodated in the accommodating portion.

  In the electrical device according to the present invention, a fitting cylinder communicating with the inside of the housing is provided on the inner back surface of the housing so as to project integrally with the housing toward the housing, and a plurality of screws are used. A screw retaining portion for screwing the arm portion into the housing portion is fitted into the fitting tube, and each arm portion is screwed into the housing portion. The screw insertion holes are provided respectively.

In the present invention, when a plurality of covers are mounted, each arm portion is accommodated in the accommodating portion. In this case, since each arm portion is screwed into the accommodating portion, a screw is inserted through each arm portion. It is fixed to a screw receiving portion that is inserted through the hole and fitted into the fitting cylinder.

  In the electric device according to the present invention, the arm portion including the moving member includes a support tube that movably supports the moving member, and the support tube has an internal dimension in which a protruding member of another arm portion can be inserted. It is characterized by that.

  In the present invention, any one of the arm portions includes a moving member and a support cylinder that movably supports the moving member, and the protruding member of the other arm portion includes the support cylinder. Is inserted into the inner surface of the moving member and abuts against the bottom surface of the moving member, and the moving member is pushed and moved in one direction. When the moving member moves to a certain position, the sensor sends an electrical signal to the control unit.

  In the electric device according to the present invention, the inner back surface of the housing portion is provided with a latching portion that latches a latching means for latching a plurality of arm portions to the housing portion, Any one of the arm portions and the hooking means are integrally formed, and the other arm portions except for the arm portion integrally formed with the hooking means are inserted through which the hooking means is inserted. A hole is provided.

  In the present invention, when a plurality of covers are mounted, the hooking means formed integrally with any one of the arm portions is inserted into the through-holes through the insertion holes provided in each arm portion. Hang.

  In the electric device according to the present invention, a movable member that is pushed by the plurality of projecting members and moves in one direction and a support hole that movably supports the movable member are provided on the inner back surface of the housing portion. The plurality of arm portions and the protruding members have the same shape.

  In the present invention, each arm portion and each projecting member of the plurality of covers have the same shape, and when the plurality of covers are mounted, the sensor may be used even if the assembly order of the covers changes. Finds the same result.

  A projector according to the present invention includes a light source lamp disposed in a housing, an image display element that displays a projection image based on light emitted from the light source, and a projection lens that enlarges and projects an image of the image display element. A fan that sucks outside air into the housing and cools the light source lamp, an air filter that filters outside air sucked into the housing, a plurality of covers attached to the housing so as to cover the air filter, In a projector including a sensor for detecting attachment / detachment and a control unit for operating / stopping the fan in accordance with the attachment / detachment detected by the sensor, the attachment / detachment of a plurality of covers is detected by one sensor. It is comprised by these.

  In the present invention, one sensor is provided to detect attachment and detachment of a plurality of covers. When a plurality of covers are attached, the sensor sends an electrical signal to the control unit.

  According to the present invention, it is possible to detect the attachment and detachment of a plurality of covers to prevent the operation of the fan with the cover removed, with one sensor, so that the configuration is simplified. Manufacturing cost can be reduced.

  According to the present invention, each of the plurality of covers is provided with an arm portion, and a protruding member or a moving member is provided at each of the base end portion or the distal end portion of the arm portion, and one sensor is provided with the protruding member or the moving member. Since the attachment / detachment of the cover is detected from the height of the overlap, it is not necessary to provide a mechanical or electrical connection with the sensor for each cover, and the configuration is simplified.

According to the present invention, since the accommodating portion that accommodates each arm portion of the plurality of covers is provided on the outside of the surface adjacent to the surface on which the cover is mounted, each arm portion is obtained without impairing the appearance of the product exterior. Can be accommodated.

  According to the present invention, since all the arm portions of the plurality of covers are screwed into the accommodating portion using screws, it is possible to prevent the occurrence of misalignment in the overlap between the projecting member and the moving member of each arm portion, and the projecting member and the movement. Overlap with the member can be performed stably.

  According to the present invention, the arm provided with the moving member is provided with the support tube that supports the moving member so that the moving member can be moved, and the protruding member of the other arm is inserted into the support tube and the moving member is provided. Since the support cylinder serves as a guide so as to make contact with the projection member, the projection member and the moving member can be reliably brought into contact with each other.

  According to the present invention, the hooking means for hooking a plurality of arm portions in the housing portion and any one arm portion of the plurality of arm portions are integrally formed, and the plurality of arm portions Since it can be hooked without using other means for hooking the inside of the housing portion, the number of parts and assembly man-hours are reduced, and the manufacturing cost is reduced.

  According to the present invention, since each arm portion and each projecting member of the plurality of covers have the same shape, it is not necessary for the user to learn the assembly order of the plurality of covers when performing the attaching and detaching operations of the covers. The working time is shortened, and the convenience of the user can be improved.

  According to the present invention, since one sensor detects attachment / detachment of a plurality of covers, a large amount of dirt entering the projector due to the rotation of the fan when the cover is detached has a simple structure. Can be prevented.

(Embodiment 1)
Hereinafter, the present invention will be described in detail based on the drawings showing the first embodiment, taking a projector as an example. FIG. 1 is a schematic plan view showing a main configuration of a projector according to Embodiment 1 of the invention.

  The projector 1 according to Embodiment 1 of the present invention includes a light source lamp 3, a reflecting mirror 20 that reflects light from the light source lamp 3, and an image to be projected using the reflected light, inside a housing 2. In order to prevent the image display element 4 to be displayed, the light source lamp 3 from overheating the inside of the housing 2, the cooling fans 6, 6 and 6 for sucking outside air into the housing 2, and the light source lamp 3, the image display device 4, A control unit 7 that controls the operation of the cooling fans 6, 6, 6 and the like is provided, and a projection lens 5 that enlarges and projects an image of the image display element 4 is provided on the front surface of the housing 2. The housing | casing 2 is a rectangular parallelepiped shape, and the front-back direction is longer than the left-right direction.

On one side surface of the housing 2, an air inlet 8 composed of a plurality of horizontal slit-shaped holes is provided. The air filters 11 and 11 made of porous synthetic resin having an appropriate thickness are substantially the same size as the one side surface, and one surface is in contact with the inside of the one side surface and closes the intake port 8. Covers 10 a and 10 b covering the air filters 11 and 11 are configured to abut against the other surfaces of the air filters 11 and 11 and press the air filters 11 and 11 against the intake port 8. An exhaust port 9 having a plurality of horizontal slit-shaped holes is provided on the other side surface of the housing 2 to exhaust high-temperature air inside the housing 2 to the outside. The covers 10a and 10b are substantially the same size as the air filters 11 and 11. The covers 10 a and 10 b are detachably attached to the housing 2. On the bottom surface of the housing 2, in the vicinity of the covers 10 a and 10 b, a housing portion 12 that houses arms 101 a and 101 b of the covers 10 a and 10 b, which will be described later, projects toward the upper side of the housing 2. . The accommodating portion 12 has a rectangular cross section that is long in the front-rear direction of the housing 2, and the surface on the cover 10a, 10b side is open. Moreover, it is a bottom face of the housing | casing 2, Comprising: The slit shape long in the front-back direction of the housing | casing 2 for mounting | wearing the cover 10a, 10b between the said one side surface of the housing | casing 2 and the said accommodating part 12 A mounting hole (not shown) is provided.

  FIG. 2 is a main part configuration diagram of a side surface of the casing in a state where the air filter and the cover of the projector according to the first embodiment of the invention are mounted, and FIG. 3 is a schematic view of the cover 10a viewed from the outside of the casing. (A) is a front view, (b) is a plan view, and (c) is a bottom view. 4A and 4B are schematic views of the cover 10b as viewed from the outside of the housing, where FIG. 4A is a front view, FIG. 4B is a plan view, and FIG. 4C is a bottom view.

  The covers 10a and 10b are made of plastic having elasticity, and include rectangular frames 112a and 112b and lattice members disposed inside the frames 112a and 112b. In order to fix the cover 10a (10b) to the casing 2, cover side fixing members 105a, 105a, 105a,... Having a plurality of vertically long rectangular sections are provided on both side edges of the cover 10a (10b). 105b, 105b, 105b... Are provided in a vertical direction in a staggered pattern. In the vicinity of the air inlet 8 in the housing 2, cylindrical cover fixing portions 15, 15, 15 for fixing the covers 10 a, 10 b are provided at equal intervals at both ends and the center of the one side surface. 2 is erected from the bottom surface to the top surface. One of the peripheral surfaces of the cover fixing portions 15 and 15 at both ends is directed toward the central cover fixing portion 15, and two are provided on the peripheral surface of the central cover fixing portion 15 toward the both ends. Fixed portion side fixing members 151, 151, 151, 151 having surfaces are provided. Each of the fixing portion side fixing members 151, 151, 151, 151 is substantially the same length as the cover fixing portion 15 and is provided in parallel with the side surface of the housing 2. In the covers 10a and 10b, the cover side fixing members 105a, 105a, 105a... 105b, 105b, 105b... Sandwich the fixing part side fixing members 151, 151, 151, 151 from the mounting holes. Thus, the cover 10 a and 10 b are fixed to the cover fixing portion 15 by being inserted into the housing 2.

  The cover 10a is provided with an arm portion 101a at the lower end portion of the surface facing the housing 2 when mounted, and at the end portion on the cover 10b side. The arm portion 101a includes a base portion extending in a direction perpendicular to the surface of the cover 10a, and a support portion 109a extending from the distal end portion of the base portion toward the cover 10b. The longitudinal dimension of the base part and the longitudinal dimension of the support part 109a are dimensions that can be accommodated in the accommodating part 12, and are made of an elastic plastic and integrally formed with the cover 10a. Near the center of the support portion 109a, an insertion hole 102a for screwing the arm portion 101a to the housing portion 12 is provided so as to penetrate the support portion 109a vertically. A support tube 104a that supports a moving member 103a that moves up and down is provided at the tip of the support portion 109a so as to protrude upward with respect to the support portion 109a. It is a square cylinder shape having an opening. The moving member 103a has a substantially I-shaped longitudinal section, and has a plate-shaped intermediate portion having a height substantially the same as the height of the support tube 104a, the intermediate portion, and the inner dimensions of the support tube 104a. It consists of the upper end part of the flat convex part which has an area, and the lower end part which is a substantially inverted square frustum shape. The bottom surface of the lower end portion is substantially the same as the inner size of the support cylinder 104a, and the moving member 103a is inserted through the opening of the support cylinder 104a so that the upper end portion is horizontal with the bottom surface of the housing 2. The On the inner side of the upper portion of the support cylinder 104a, three convex portions for preventing the moving member 103a from slipping out are projected toward the inner side of the support cylinder 104a. Therefore, both end portions of the moving member 103a are hooked on the convex portion. In the center of the lower portion of the other surface of the cover 10a, a leg portion 106a that supports the cover 10a by contacting the outside of the bottom surface of the housing 2 is provided.

The cover 10b is provided with an arm portion 101b including a base portion and a support portion 109b at a position symmetrical to the cover 10a. A plate-like protruding member 103b extending along the longitudinal direction of the base is provided upright on the upper surface of the base. The distal end portion of the support portion 109b has an insertion hole 102b for screwing the arm portion 101b to the housing portion 12. Further, the cover 10b has a leg 1 at the bottom.
The leg part 106b is provided similarly to 06a.

  At one end of the ceiling portion of the housing portion 12, a circular fitting member 123 projects from the housing 2. In addition, a cylindrical screw receiving part 121 having a bottom surface on one side for screwing the arm parts 101a and 101b is fitted into the upper part of the fitting member 123 so that the bottom surface faces upward. ing. An insertion hole 122 through which the support tube 104a of the arm portion 10a is inserted is provided at the other end of the ceiling portion of the housing portion 12 so as to penetrate up and down the ceiling portion. Immediately above the insertion hole 122, an operation lever 131 of the rotary switch 13 for detecting attachment and detachment of the covers 10a and 10b is disposed.

  On the bottom surface of the housing 2 in the vicinity of the insertion hole 122, a square cylindrical switch seat for attaching the rotation switch 13 is provided so as to be connected in the longitudinal direction of the housing portion 12. The rotation switch 13 has a square bar-shaped operation lever 131, and the rotation axis of the operation lever 131 is provided so as to be orthogonal to the side surface of the housing 2. Further, the end portion of the operating lever 131 is disposed in the ascending / descending region of the moving member 103a. The rotary switch 13 has a built-in spring and always urges the operating lever 131 in the direction of pushing. In this case, the rotation switch 13 is turned off. On the other hand, when the operating lever 131 rotates more than a predetermined angle due to the rising of the moving member 103a, the rotation switch 13 is turned on. The control unit 7 electrically connected to the rotation switch 13 detects on / off of the rotation switch 13 and operates / stops the cooling fan 6.

  FIG. 5 is an explanatory diagram for explaining detection of attachment / detachment of the covers 10a and 10b in the projector according to Embodiment 1 of the present invention. Before the covers 10a and 10b are mounted, the lower surface of the operating lever 131 is always kept parallel to the bottom surface of the housing 2 (FIG. 5A).

  When the cover 10 a is attached to the housing 2, the arm portion 101 a is fit so that the upper surface faces the ceiling portion of the housing portion 12, and the support tube 104 a of the arm portion 101 a is inserted into the insertion hole 122 of the housing portion 12. Is done. At this time, the upper end surface of the moving member 103a is in a position in contact with the lower surface of the operating lever 131 (FIG. 5B). However, the upper end surface of the moving member 103a is only in contact with the lower surface of the operating lever 131 and is not pushed upward.

  Next, the cover 10 b is attached to the housing 2. The arm part 101b is accommodated in the accommodating part 12 like the arm part 101a. At this time, the screw 14 is inserted into the insertion hole 102b provided in the distal end portion of the support portion 109b and the insertion hole 102a of the arm portion 101a, and is fitted to the screw receiving portion 121 of the housing portion 12. As a result, the arm portion 101 a and the arm portion 101 b are screwed into the housing portion 12.

  In this case, the protruding member 103b of the arm portion 101b is inserted from below into the support tube 104a of the arm portion 101a, contacts the lower end surface of the moving member 103a, and pushes the moving member 103a upward (FIG. 5). (c)).

  The moving member 103a is pushed upward by the protruding member 103b of the arm portion 101b and moves upward, pushes up the operating lever 131 in contact with the moving member 103a, and rotates the operating lever 131 vertically by a predetermined angle or more (see FIG. 5 (d)), the rotary switch 13 is turned on. In this case, the control unit 7 detects that the rotation switch 13 is on and starts the operation of the cooling fan 6.

Further, when the screw 14 is removed and the cover 10a and / or 10b is detached, the moving member 103a is lowered downward, and the operating lever 131 is positioned before the covers 10a and 10b are attached by the restoring force of the spring. The rotary switch 13 does not emit an electrical signal. At this time, the control unit 7 stops the operation of the cooling fan 6.

  In the first embodiment, the case where there are two covers has been described. However, the present invention is not limited to this, and the present invention can also be applied to a case where there are three or more covers. For example, a case where one cover is provided on each side of the two covers of the first embodiment and the number of covers is four will be described. The length of the base of each arm is the same, and only the length of the support is changed. That is, the length of the two support portions on both ends of the four covers that are mounted is made longer than the two at the center. The positions of the insertion holes, the movable members, and the (moving members) of the respective support portions are provided in accordance with the positions of the support holes, the screw retaining portions, and the like of the housing portion 12. The accommodating portion 12 is provided in the vicinity of the center between the two covers, and the length of the housing 2 in the front-rear direction is increased so that the arms of the covers on both ends can be accommodated. The height in the vertical direction is increased in accordance with the increase of. Further, the rotation switch 13 is arranged in accordance with the height of the accommodating portion 12.

  Moreover, in Embodiment 1, although the case where there was one rotation switch 13 was demonstrated, it is not limited to this, It is applicable also to the case where there are two or more rotation switches 13. . For example, a case where there are four covers and two rotation switches 13 will be described. Of the four covers attached to the housing 2, one storage portion 12 for storing each of the two arm portions is provided in the vicinity between the two on one end side, and between the two on the other end side Are provided with other accommodating portions 12 for accommodating the two arm portions. Further, the rotation switches 13 and 13 are arranged in accordance with the positions of the respective accommodating portions 12 and 12. The control unit 7 operates the cooling fan 6 when the rotary switches 13 and 13 are on.

(Embodiment 2)
FIG. 6 is an explanatory diagram for explaining detection of attachment / detachment of the cover in the projector according to Embodiment 2 of the present invention.

  As in the first embodiment, the cover 10a is provided with an arm portion 101a and a leg portion 106a including a base portion and a support portion 109a. Near the center of the support portion 109a, an insertion hole 102a for screwing the arm portion 101a to the housing portion 12 is provided, and the portion from the tip of the support portion 109a to the insertion hole 102a is It is inclined downward with respect to the horizontal direction and is movable up and down by elasticity. A protruding member 108a having an I-shaped longitudinal section for pushing up the operating lever 131 of the rotary switch 13 is provided at the end of the downwardly inclined portion upward with respect to the bottom surface of the housing 2. Yes.

  Similarly to the cover 10a, the cover 10b is provided with an arm portion 101b and a leg portion 106b each including a base portion and a support portion 109b. A plate-like protruding member 103b extending along the longitudinal direction of the base is provided upright on the upper surface of the base. A hook-like hooking means 16 for hooking the arm portions 101a and 101b to the housing portion 12 is provided at the end of the support portion 109b so as to protrude upward with respect to the bottom surface of the housing 2. .

  A cylindrical hooking portion 124 that communicates with the inside of the housing 2 is provided on one of the ceiling portions of the housing portion 12, and the protruding member 17 on which the hooking means 16 is hooked is provided on the hooking portion 124. Is provided toward the central axis of the latching portion 124. As in the first embodiment, an insertion hole 122 is provided on the other ceiling portion of the housing portion 12.

  Before the covers 10a and 10b are attached, the lower surface of the operating lever 131 is always kept parallel to the bottom surface of the projector 1 (not shown).

When the cover 10 a is attached to the housing 2, the arm portion 101 a is accommodated so that the upper surface faces the ceiling portion of the housing portion 12, and the protruding member 108 a of the arm portion 101 a is inserted into the insertion hole 1 of the housing portion 12.
22, abuts against the lower surface of the operating lever 131 positioned directly above the insertion hole 122, and the operating lever 131 is slightly pushed upward to rotate. However, the rotation angle of the operation lever 131 at this time is smaller than a predetermined angle. (FIG. 6 (a)).

  Next, the cover 10 b is attached to the housing 2. The arm part 101b is accommodated in the accommodating part 12 like the arm part 101a. At this time, the hooking means 16 at the tip of the arm portion 101b is hooked on the hooking portion 124 provided in the housing portion 12 through the insertion hole 102a of the arm portion 101a, whereby the arm portion 101a and The arm portion 101 b is hooked in the housing portion 12.

  In this case, the protruding member 103b of the arm portion 101b contacts the lower end surface of the protruding member 108a of the arm portion 101a and pushes upward. Thereby, the portion inclined downward in the arm portion 101a is pushed up until it comes into contact with the ceiling surface of the housing portion 12. At this time, the protruding member 108a in contact with the operating lever 131 pushes the operating lever 131 further upward to rotate it more than a predetermined angle (FIG. 6B), and turns on the rotation switch 13. In this case, the control unit 7 detects that the rotation switch 13 is on and operates the cooling fan 6.

  The same parts as those of the projector according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

(Embodiment 3)
FIG. 7 is an explanatory diagram for explaining detection of cover attachment / detachment in the projector according to Embodiment 3 of the present invention.

  The housing portion 12 that houses the arm portion 101a and the arm portion 101b is provided on the bottom surface of the housing 2 as in the first embodiment. A support hole 19 for supporting the movable member 18 that moves up and down is provided near the center of the ceiling portion of the housing portion 12 so as to penetrate the inside and the outside of the ceiling portion. The movable member 18 has a shape like a rivet, and the diameter of the upper end portion is increased to prevent the movable member 18 from falling out of the support hole 19. A square bar-shaped operating lever 131 of the rotary switch 13 is disposed directly above the movable member 18.

  As in the first embodiment, the cover 10a is provided with an arm portion 101a and a leg portion 106a including a base portion and a support portion 109a. The support portion 109a extending in the direction of the cover 10b from the distal end portion of the base portion is inclined downward from the horizontal direction and can be moved up and down by elasticity. A protruding member 111 a having an inverted T-shaped longitudinal section is provided at the end of the support portion 109 a so as to face upward with respect to the bottom surface of the housing 2.

  Similarly to the cover 10a, the cover 10b is provided with an arm portion 101b and a leg portion 106b each including a base portion and a support portion 109b. Since the arm part 101b has the same form as the arm part 101a, detailed description is omitted.

  Before the covers 10a and 10b are mounted, the bottom surface of the operating lever 131 is always kept parallel to the bottom surface of the projector 1 (not shown).

  When the cover 10 a is attached to the housing 2, the arm portion 101 a is accommodated so that the upper surface faces the ceiling portion of the housing portion 12. The protruding member 111a of the arm portion 101a abuts on the lower end surface of the movable member 18 of the accommodating portion 12, and pushes up the movable member 18 slightly upward. At this time, the movable member 18 moves upward to a position in contact with the lower surface of the operating lever 131, but does not rotate the operating lever 131 (FIG. 7A).

Next, when the cover 10b is attached to the housing 2, the arm portion 101b is housed in the housing portion 12 in the same manner as the arm portion 101a. At this time, the protruding member 111b comes into contact with the lower end surface of the protruding member 111a at the tip of the arm portion 101a and pushes the protruding member 111a upward. Accordingly, the movable member 18 is pushed upward further by the protruding member 111b and the protruding member 111a, and the operating lever 131 is rotated by a predetermined angle or more in the vertical direction (FIG. 7B), and the rotation switch 13 is turned on. To do. In this case, the control unit 7 detects that the rotation switch 13 is on and operates the cooling fan 6.

  In the above-described third embodiment of the present invention, the case where the cover 10a is attached first has been described as an example. However, since the arm portion 101a and the arm portion 101b have the same form, the cover 10b is attached first. good.

  The same parts as those of the projector according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the above-described first, second, and third embodiments of the present invention, the case where the air filters 11 and 11 and the covers 10a and 10b are provided inside the casing 2 has been described. The case where the filters 11 and 11 and the covers 10a and 10b are provided outside the housing 2 may be used.

  In the first, second, and third embodiments of the present invention described above, the projector has been described as an example. However, the present invention is not limited to this, and can be applied to, for example, a DVD recorder, an electric microscope, and a personal computer.

FIG. 2 is a schematic plan view showing a main configuration of the projector according to Embodiment 1 of the invention. It is a principal part block diagram of the side surface of the housing | casing of the state which mounted | wore with the air filter and cover of the projector which concern on Embodiment 1 of this invention. It is a schematic diagram of the cover of the projector which concerns on Embodiment 1 of this invention. It is a schematic diagram of the cover of the projector which concerns on Embodiment 1 of this invention. It is explanatory drawing explaining the detection of attachment / detachment | attachment of the cover in the projector which concerns on Embodiment 1 of this invention. It is explanatory drawing explaining the detection of attachment / detachment | attachment of the cover in the projector which concerns on Embodiment 2 of this invention. It is explanatory drawing explaining the detection of mounting | wearing / separation of the cover in the projector which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Housing | casing 3 Light source lamp 4 Image display element 5 Projection lens 6 Cooling fan 7 Control part 8 Intake port 9 Exhaust port 10a, 10b Cover 11 Air filter 12 Housing part 13 Rotation switch 14 Screw 16 Covering means 17 Convex member DESCRIPTION OF SYMBOLS 18 Movable member 19 Support hole 20 Reflector 101a, 101b Arm part 102a, 102b Insertion hole 103a Moving member 104a Support cylinder 106a, 106b Leg part 108a Projection member 109a, 109b Support part 112a, 112b Frame body 103b Projection member 121 Screw receiving Part 122 insertion hole 123 fitting member 124 latching part 131 actuating lever

Claims (8)

A fan that sucks outside air into the housing;
An air filter for filtering outside air sucked into the housing;
A plurality of covers attached to the housing in a state of covering the air filter;
A sensor for detecting the attachment and detachment of the cover;
In an electrical device comprising: a control unit that operates / stops the fan in accordance with attachment / detachment detected by the sensor;
An electrical device configured to detect attachment and removal of a plurality of covers by a single sensor. The cover includes a rectangular frame,
When mounting the cover, an arm portion extending in a direction perpendicular to the surface facing the housing side is provided at one end of the frame,
In the proximal end or the distal end of the arm,
A protruding member that stands upright with respect to the arm part, or a moving member that moves in a direction perpendicular to the arm part,
2. The electric device according to claim 1, wherein when the plurality of covers are mounted, the protruding member or the moving member overlaps.   The electrical apparatus according to claim 1, wherein a housing portion that houses each arm portion of the plurality of covers is recessed outside a surface adjacent to a surface on which the cover is mounted. On the inner back surface of the housing part,
A fitting tube communicating with the inside of the housing, and projecting integrally with the housing portion toward the inside of the housing;
A screw retaining portion for screwing a plurality of arm portions into the housing portion using screws is internally fitted in the fitting cylinder,
The electric device according to claim 3, wherein each arm portion is provided with a screw insertion hole for screwing each arm portion into the housing portion. The arm portion including the moving member is
A support cylinder for movably supporting the moving member;
The electrical apparatus according to any one of claims 2 to 4, wherein the support cylinder has an internal dimension into which a protruding member of another arm portion can be inserted. On the inner back surface of the housing portion, a hooking portion for hooking a hooking means for hooking a plurality of arm portions to the housing portion is provided,
Any one of the plurality of arm portions and the hooking means are integrally formed,
In the other arm parts excluding the arm part integrally formed with the hooking means,
The electric device according to claim 3, wherein an insertion hole through which the hooking means is inserted is provided. On the inner back surface of the housing part,
A movable member that is pushed by a plurality of protruding members and moves in one direction;
A support hole for movably supporting the movable member,
The electric device according to claim 3, wherein the plurality of arm portions and the protruding members have the same shape. A light source lamp arranged in the housing;
An image display element for displaying a projected image based on light emitted from the light source;
A projection lens for enlarging and projecting an image of the image display element;
A fan that sucks outside air into the housing and cools the light source lamp;
An air filter for filtering outside air sucked into the housing;
A plurality of covers attached to the housing in a state of covering the air filter;
A sensor for detecting the attachment and detachment of the cover;
In a projector comprising: a control unit that operates / stops the fan according to attachment / detachment detected by the sensor;
A projector configured to detect attachment and removal of a plurality of covers by a single sensor.

Images