JP2008071538A - Switch device, electric equipment, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch device capable of detecting presence of two filters with one detecting switch. <P>SOLUTION: The switch device 30 is provided with a detecting movable part 24 protruded on one face of a detecting switch main body 22 and biased to be switched from a position of a switching-on operation to a switching-off operation, and a rotatable detecting lever 29 capable of being loosely fitted with the detecting movable part 24 as a rotating axis. As the detecting lever 29 rotates by detecting either of a first or a second filter 4, 6, the detecting movable part 24 makes a switching-off operation as it is set at a position of switching-off operation, makes a switching-off operation at the position when neither of the first and the second filters 4, 6 is detected, and the detecting lever 29 moves to a position for the detecting movable part 24 to make a switching-on operation by detecting both the first and the second filters 4, 6 to make a switching-on operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a switch device, an electric device using the switch device, and a projector.

  In an electric device such as a projector, heat in the device casing is discharged by a cooling fan in order to prevent heating of the light source lamp or the like due to heat generation and prevent component failure. In order to prevent outside dust and the like from entering the device casing when the cooling fan sucks into the device casing, an air filter for dust prevention is provided at the inlet of the electric device.

The following proposals have been made as projectors having this type of air filter.
In the example shown in Patent Document 1, a concave air filter housing recess having a plurality of vent holes on the bottom surface is provided in an exterior case of a projector, the air filter is stored in the air filter housing recess, and then the opening surface of the air filter housing recess In addition, an air filter replacement lid having a plurality of vent holes is detachably attached by locking, and the air filter can be taken out from the air filter housing recess by detachment of the air filter replacement lid.

Further, in the example shown in Patent Document 2, when the intake port of the casing guarded by the dustproof filter attached to the filter cover is used in a state of being blocked by some obstacles, the spring member is used from the side surface of the casing. By pressing the filter cover supported by being pushed outward to the inside of the casing, the second detection switch provided inside the casing can be pressed to detect that the intake port is blocked, Further, the first detection switch provided inside the housing is in a non-contact state with the end portion of the filter cover, so that it is possible to detect the non-attachment of the filter cover.
JP 2004-109781 A JP 2000-261740 A

However, in many conventional projectors such as Patent Document 1, in order to facilitate the cleaning or replacement of the air filter, the air filter is also removed at the same time by removing the filter cover.
Therefore, when the filter cover is removed while the power is on, or when the power is turned on with the filter cover removed, a large amount of contaminated outside air is not filtered by the operation of the cooling fan. There is a problem of being sucked.

  Therefore, in order to prevent such a problem, in Patent Document 2, a detection switch is provided to detect the attachment / detachment state of the filter cover. However, the first detection switch and the intake air that detect the non-attachment of the filter cover are provided. It is equipped with a second detection switch that detects the movement of the filter cover when the mouth is blocked, and uses two detection switches for one detection target. There is room for improvement in making the configuration simple and low-cost, such as when performing the detection or when detecting whether or not a plurality of filter covers are attached with a single detection switch.

  The present invention has been made in view of such circumstances, and its object is to detect a switch based on whether or not both of the two detected objects are detected. An object of the present invention is to provide a switch device that can detect the presence or absence of two objects to be detected with one detection switch by performing an on operation or a switch off operation.

  Another object of the present invention is to provide a switch device with high detection accuracy by disposing a detection switch on a bracket that is not affected by disturbance.

  Still another object of the present invention is to provide a switch device that can smoothly guide the movement of the detection lever as the detection lever rotates and reciprocates along a gap provided in the bracket. There is.

  Another object of the present invention is that the movement of the protrusion can be efficiently transmitted to the detection lever by making the protrusion of the detected body abut without the detection lever of the detection switch being biased. It is to provide a switch device.

  Another object of the present invention is to provide a switch device that can suppress the shaking of the detection lever in the left-right direction by adopting a configuration that guides the detection lever of the detection switch.

  Another object of the present invention is that the inner surface of the through hole of the detection lever that loosely fits the detection movable portion of the detection switch is tapered, thereby eliminating the need for reciprocation of the detection movable portion of the detection switch and the detection lever. An object of the present invention is to provide a switch device that can suppress unnecessary interference.

  Another object of the present invention is to provide a switch device in which the protrusions of the detected body can smoothly come into contact with the detection lever by curving both blades of the detection lever of the detection switch.

  Another object of the present invention is that the power can be turned off with one detection switch when either of the two filters is pulled out, or the cooling fan is stopped, so that the operation is not performed with the filter removed. An object is to provide an electric device and a projector.

  The switch device of the present invention includes a detection switch that performs a switch operation by detecting each of the first detection object and the second detection object, and a bracket that carries the detection switch. When detecting one of the first and second objects to be detected, or when not detecting both of the first and second objects to be detected, a switch-off operation is performed, and the first and second objects to be detected are detected. The switch-on operation is performed only when both bodies are detected.

  In the switch device of the present invention having such a configuration, when the bracket carrying one detection switch is arranged to detect either one of the two detection objects or not both, one detection switch is Only when the switch-off operation is performed and both of the two detection objects are detected, the switch-on operation is performed.

  In the switch device of the present invention, the detection switch protrudes from one surface of the detection switch body and is urged so as to switch from the switch-on operation position to the switch-off operation position, and the detection movable section. And a rotatable detection lever that fits freely as a rotation axis, and the detection movable portion is detected by detecting one of the first and second detected bodies and rotating the detection lever. Is configured to switch off.

  In the switch device of the present invention configured as described above, one of the two detection objects contacts the detection lever, the detection lever rotates with the detection movable portion as a rotation axis, and the detection movable portion performs a switch-off operation. To do.

  Furthermore, in the switch device of the present invention, the detection switch protrudes from one surface of the detection switch body and is urged to switch from the switch-on operation position to the switch-off operation position, and the detection movable section And a rotatable detection lever that fits freely as a rotation shaft, and when the first and second detected bodies are not detected, the detection movable part performs a switch-off operation, The detection movable part performs a switch-on operation by detecting both of the second objects to be detected and moving the detection lever to a position where the detection movable part is switched on. And

  In the switch device of the present invention having such a configuration, when both of the two detection objects are not in contact with the detection lever, the detection movable portion maintains the origin position and maintains the switch-off operation. When both of the detected objects come into contact with the detection lever, the detection movable part moves to the upper limit point against the urging force and performs a switch-on operation.

  In the switch device of the present invention, the detection switch has flat side surfaces and positioning protrusions provided on one side surface, and the bracket is erected on the substrate and the substrate. An L-shaped member and a Z-shaped member, and the Z-shaped member has a groove into which the protruding portion is fitted, and the L-shaped member and the Z-shaped member have the protruding portion fitted into the groove. Thus, the detection switch is sandwiched.

  In the switch device of the present invention having such a configuration, the protrusion on the side surface of the detection switch main body is fitted into the groove of the Z-shaped member, and the L-shaped member and the Z-shaped member sandwich both side surfaces of the detection switch main body, Prohibit movement of the main body from side to side and back and forth.

  The switch device according to the present invention is characterized in that the L-shaped member and the Z-shaped member have a hook-shaped protrusion at an inner edge of each upper end of the L-shaped member and the Z-shaped member.

  In the switch device of the present invention having such a configuration, when the detection switch is mounted on the L-shaped member and the Z-shaped member, the L-shaped member is deformed, and the L-shaped member and the Z-shaped member sandwich the detection switch body. The hook-shaped protrusion prohibits the swinging of the detection switch, for example, the vertical movement.

  In the switch device according to the present invention, the bracket has a U-shaped member erected on the substrate, and the U-shaped member faces the L-shaped member and the Z-shaped member via a gap. The detection lever is disposed in the gap.

  In the switch device of the present invention having such a configuration, the detection lever rotates and reciprocates along the gaps between the L-shaped member, the Z-shaped member, and the U-shaped member, and from the through hole of the detection lever. The projecting detection movable part does not come into contact with the concave part of the U-shaped member, and a reciprocable space is ensured.

  In the switch device of the present invention, the first detected body has a first protrusion, the second detected body has a second protrusion, and the detection lever is loosely fitted to the substrate. It is characterized by having a hole through which one of the first protrusion and the second protrusion enters and exits at a position symmetrical to the detection movable part in accordance with the attachment / detachment of the detection object.

  In the switch device of the present invention having such a configuration, the first protrusion and the second protrusion enter / exit the hole of the substrate in response to the attachment / detachment of the detection target, push up each blade of the detection lever, and the detection lever Rotate or reciprocate.

  The switch device of the present invention is characterized in that the detection lever has a through hole with respect to the rotation shaft, and has an edge protruding in a cylindrical shape around the through hole.

  In the switch device according to the present invention having such a configuration, the edge of the detection lever fits in the gap between the L-shaped member and the Z-shaped member, and the detection lever that rotates or reciprocates according to the movement of the detection movable portion. Reduce blurring.

  The switch device according to the present invention is characterized in that the through hole of the detection lever is formed narrow in a tapered shape along the insertion direction of the detection movable portion.

  In the switch device of the present invention having such a configuration, the detection movable portion reciprocates while loosely fitting along the tapered surface of the through hole in accordance with the rotation or reciprocation of the detection lever.

  The switch device according to the present invention is characterized in that the detection lever has curved ends on both wings.

  In the switch device of the present invention having such a configuration, the first protrusion and the second protrusion of the detected object smoothly contact the curved wing, and the detection lever rotates smoothly with the detection movable part as the rotation axis. To do.

  The electrical device of the present invention sucks air through a power source, a detachable first filter and a second filter that are provided at an air inlet of the housing and filters outside air, and negatively passes through the housing. In an electrical apparatus including an exhaust fan for pressure, any one of the switch devices of the present invention in which the first and second filters are the first and second detected bodies is provided in the housing. In the switch device, the first object to be detected is the first filter, the second object to be detected is the second filter, and the switch device includes the first and second filters. It is configured that the power supply is automatically cut off by detecting the detachment of either of the filters or both of the filters and performing a switch-off operation.

  In the electric apparatus of the present invention having such a configuration, even if one or both of the two filters are pulled out, the switch-off operation is performed and the power is automatically turned off.

  The electrical device according to the present invention is characterized in that the detection switch automatically turns on the power supply by detecting the attachment of both the first and second filters and performing a switch-on operation.

  In the electrical apparatus of the present invention having such a configuration, the switch-on operation is performed only when it is detected that two filters are mounted, and the power supply is automatically turned on.

  According to another aspect of the invention, there is provided a projector including a fan that sucks outside air into the casing and exhausts heat, and a first filter and a second filter that filter the outside air sucked into the casing. Any one of the switch devices of the present invention in which the first and second filters are used as the first and second detected bodies is provided, and the first detected body in the switch device is the first filter. The second object to be detected is the second filter, and the switch device detects the detachment of either the first filter or the second filter, or the detachment of both, and performs a switch-off operation. The fan is configured to be stopped by performing the operation.

  In the switch device of the present invention having such a configuration, the switch-off operation is performed even if one or both of the first filter and the second filter are pulled out.

  In the projector according to the aspect of the invention, the one detection switch in the switch device may start the operation of the fan by detecting the mounting of both the first and second filters and performing a switch-on operation. It is characterized by being.

  In the projector of the present invention having such a configuration, the switch-on operation is performed only when it is detected that the first filter and the second filter are attached.

Since the switch device of the present invention performs a switch-on operation only when detecting two objects to be detected and performs a switch-off operation in other cases, the presence or absence of the two objects to be detected is detected by one detection switch. It has the effect that it can be done.
Therefore, the switch device of the present invention can simplify the configuration of the detection mechanism and reduce the cost.

Since the switch device of the present invention performs the switch-off operation when detecting one of the two detected objects, the two types of states in which one of the two detected objects is present can be switched off as one switch-off. This has the effect that it can be detected as a state.
Therefore, for example, when the detected object is a filter, the switch device of the present invention performs a switch-off operation when any of the filters is removed, and can turn off the power of the cooling fan, for example.

Since the switch device of the present invention performs the switch-on operation when both of the two detection objects are detected and the switch-off operation when both are not detected, the presence or absence of the two detection objects is detected by one detection switch. It has the effect that it can be done.
Therefore, the switch device of the present invention can simplify the configuration of the detection mechanism and reduce the cost.

  Since the switch body of the present invention has the detection switch body fixed by the bracket, there is an effect that no disturbance is applied to the detection movable part and the detection accuracy is good.

  In the switch device of the present invention, the L-shaped member and the Z-shaped member sandwich the detection switch body, and the hook-shaped protrusion prohibits the swinging of the detection switch, for example, the vertical movement. Therefore, the detection accuracy is good without causing disturbance.

  The switch device of the present invention guides the movement of the detection lever because the detection lever rotates and reciprocates along the gap between the L-shaped member and the Z-shaped member of the bracket and the U-shaped member. Has the effect of being able to.

  In the switch device according to the present invention, the first protrusion and the second protrusion enter and exit from the hole of the substrate at a position symmetrical to the detection movable part serving as the rotation axis of the detection lever. There is an effect that the two protrusions can be efficiently transmitted to the detection lever without being biased.

  The switch device of the present invention has an effect that the detection lever can be prevented from shaking in the left-right direction because the edge of the detection lever is guided by the L-shaped member and the Z-shaped member.

  In the switch device of the present invention, the detection movable part moves along the tapered surface of the through-hole according to the rotation or reciprocation of the detection lever, so that the interference between the reciprocation of the detection movable part and the detection lever is suppressed. Has the effect of being able to.

  In the switch device of the present invention, since the end portion of the detection lever is curved, the first protrusion and the second protrusion of the detected body smoothly contact the wing of the detection lever, and the rotation of the detection lever is smooth. It has the effect that it can be made.

  Since the electric device and projector of the present invention have a structure in which the power can be turned off with one detection switch or the cooling fan stops even if any of the two filters is pulled out, the device can be used without the filter attached. It is possible to prevent the occurrence of problems due to the above.

  Since the electric device and projector of the present invention perform the switch-on operation only when both of the two filters are detected, the switch-on operation is performed only when two filters are mounted, and the filter is not mounted. Sometimes, the switch-on operation is not performed, and it is possible to prevent problems due to the use of the device in a state where either filter or both filters are not attached.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment will be described with reference to the drawings by taking a projector as an example of an electric device using a switch device according to the invention.
A projector usually includes a light source arranged in a housing, an image display element that displays a projected image based on the three primary colors emitted from the light source, a projection lens that enlarges and projects an image of the image display element, and an outside air. A cooling fan that sucks into the body and cools the light source, and a first filter and a second filter that filter outside air sucked into the housing.
The electrical equipment includes a power source, a detachable first filter and a second filter that are provided at an intake port of the housing and filters outside air, and an exhaust fan that sucks air through the filter and creates negative pressure in the housing. With.

In the projector and the electric device, the first filter and the second filter correspond to the first detected body and the second detected body, respectively. In the switch device of the present invention, a first filter rib, which will be described later, corresponds to a first protrusion, and a second filter rib corresponds to a second protrusion.
In the switch device of the present invention, when cleaning the filter, when the filter is pulled out from the main body, the power is switched on by one switch regardless of whether the two filters are pulled out in order not to operate with the filter removed. It is configured to cut automatically. Details will be described below.

1A and 1B are external views showing filter attachment / detachment of the projector according to the present embodiment, where FIG. 1A shows a state after the filter is attached, and FIG. 1B shows attachment / detachment of the filter. 2A and 2B are front views of the filter according to the present embodiment. FIG. 2A is a front view of the first filter, and FIG. 2B is a front view of the second filter. FIG. 3 is a partial external view showing the first and second filter ribs according to the present embodiment.
The projector according to the present embodiment includes a first filter 4 and a second filter 6 detachably facing the air inlet 2, and the filters 4 and 6 are inserted through the filter insertion ports 8 and 9. It is adapted to be fitted to the projector housing 3.

  The first filter 4 has a first filter rib 12 erected on a base 10 provided on the inner side of the case at the lower end of one side, and the second filter 6 is on the inner side of the case at the lower end of one side. The second filter ribs 14 are provided upright on a base 16 provided in the base plate. The first filter rib 12 and the second filter rib 14 are L-shaped plate-like members, and when both the filters 4 and 6 are mounted on the projector, the first filter rib 12 and the second filter rib 14 are in symmetrical positions. Opposing to occupy.

FIG. 4 is an external view showing a detection switch according to the switch device of the present invention used in the present embodiment. 5A and 5B are external views of the bracket of the switch device for the projector according to the present embodiment. FIG. 5A is a right external view, and FIG. 5B is a left external view. FIG. 6 is a cross-sectional view taken along the line AA in FIG.
The detection switch 20 is, for example, a leaf switch, and includes a detection switch main body 22, a detection movable portion 24 protruding from the front surface of the detection switch main body 22, and three terminals 26, 27, and 28.
The detection movable part 24 is elastically urged so as to always switch from the switch-on position to the switch-off position.
Note that the detection switch 20 shown in FIG. 4 is in a switch-off state.

  Of the three terminals, the central common terminal 27 and the upper terminal 28 are connected, and the detection switch 20 is normally set to be normally off so as to maintain the switch-off state. At this time, the detection movable part 24 is in the origin position shown in FIG. When the detection movable unit 24 is displaced upward from the origin position, the restoring force is applied to the detection movable unit 24 so that the detection movable unit 24 is switched on and returned to the origin position by the biasing force of the elastic body.

  The detection lever 29 for detecting the detection object is loosely fitted to the detection movable portion 24 and is rotatable about the detection movable portion 24 as a rotation axis. The detection lever 29 has a shape having both wings, and each wing is rounded toward the tip and formed in a curved shape. A through hole 32 for loosely fitting the detection movable portion 24 is provided in the center of the detection lever 29, and the through hole 32 is tapered so as to be narrower in the direction in which the detection movable portion 24 is inserted. Further, a cylindrical edge 34 is formed along the edge of the through hole 32 of the detection lever 29.

As shown in FIG. 5, the bracket 40 of the switch device according to the present embodiment sandwiches a concave U-shaped member 44, a detection switch body 22, which is erected on a substrate 42. L-shaped member 46 and Z-shaped member 48 that prohibit the movement of the screw, and a mounting base 49 with a hole 36 for the washer-attached screw 36. Has a groove 50 for fitting.
Further, the bracket 40 has a first detection hole 56 of a through hole that goes in and out so that the first filter rib 12 pushes up without contacting the substrate 42, and a through hole that goes in and out so that the second filter rib 14 pushes up without contacting. The second detection hole 58 is symmetrically positioned with respect to the detection movable portion 24 of the detection switch 20 to be installed.

The first detection hole 56 and the second detection hole 58 are formed as holes having shapes corresponding to the cross-sectional shapes of the first filter rib 12 and the second filter rib 14, that is, L-shaped holes.
Furthermore, as shown in FIG. 6, the L-shaped member 46 and the Z-shaped member 48 are provided with small hook-shaped protrusions 52 and 54 at the inner edge of the upper end, and the lower surfaces 51 and 53 of the protrusions 52 and 54 are L-shaped. It is also possible to fix the detection switch main body 22 without using the washer-attached screw 36 by forming the mold member 46 and the Z-shaped member 48 so as to be substantially perpendicular to the inner surface.
4 indicates the direction in which the detection lever 29 is inserted into the detection movable unit 24. In FIG. 5, 55 indicates a gap between the U-shaped member 44 and the L-shaped member 46 and the Z-shaped member 48, and 57 indicates a gap between the L-shaped member 46 and the Z-shaped member 48.

Next, a procedure for mounting the switch device according to the present embodiment will be described.
FIG. 7 is an external view showing the switch device of the present invention mounted in the projector casing according to the present embodiment. FIG. 8 is a schematic diagram showing how to install the detection switch according to the present embodiment. FIG. 9 is a right external view of the switch device of the present invention when two filters are mounted on the projector according to the present embodiment. FIG. 10 is a left external view of the switch device of the present invention when two filters are mounted on the projector according to the present embodiment. FIG. 11 is a partial side view showing the state of the detection switch, and the arrow indicates the direction in which the biasing force acts.

  In the present embodiment, first, plugs with signal lines are inserted into the terminals 27 and 28, and then the detection lever 29 is loosely fitted to the detection movable portion 24 (see FIG. 8). At this time, the detection movable part 24 can be loosely fitted along the tapered surface of the through hole 32 provided in the center of the detection lever 29.

Next, the detection lever 29 is positioned in the gap 55 between the U-shaped member 44, the L-shaped member 46, and the Z-shaped member 48, and the protrusion 25 of the detection switch body 22 is a groove in the Z-shaped member 48. 50, the detection switch body 22 is fitted into the L-shaped member 46 and the Z-shaped member 48 so as to be fitted to each other (see FIGS. 5, 8, and 9). As a result, the L-shaped member 46 is deformed, and the L-shaped member 46 and the Z-shaped member 48 sandwich the detection switch main body 22 and move up and down with the substantially right-angled lower surfaces 51 and 53 formed on the hook-shaped protrusions 52 and 54. The movement is prohibited (see FIGS. 6 and 9).
At this time, the edge portion 34 of the detection lever 29 fits into the gap 57 between the L-shaped member 46 and the Z-shaped member 48, and the lateral movement of the detection movable portion 24 is suppressed (see FIGS. 9 and 10).
Further, the U-shaped member 44 secures a space in which the detection movable portion 24 protruding from the through hole 32 of the detection lever 29 does not contact within the concave portion of the U-shaped member 44 (FIG. 9). And FIG. 10).

  Finally, while holding the upper surface of the detection switch body 22 with the washer 36 with a washer, the screw 36 with a washer is screwed into the mounting base 49 with a hole to fix the upper surface of the detection switch body 22.

As shown in FIGS. 9 and 10, the first filter rib 12 and the second filter rib 14 are arranged so that the detection movable portion 24 of the switch device 30 reaches the maximum position indicating the switch-on state. Lifting 29 wings. Moreover, FIG. 11 shows that the switch is in the on state at the position of the detection movable unit 24 in the switch device 30 shown in FIGS. 9 and 10.
In FIG. 8, the arrow of the detection lever 29 indicates the direction in which the detection lever 29 is inserted into the detection movable part 24, and the arrow of the screw 36 with washer indicates the insertion direction of the screw.

  In the present embodiment having such a configuration, the first filter rib 12 and the second filter rib 14 push up both wings of the detection movable portion 24, so that the switch device 30 is switched on, and the projector receives the first filter 4 and It is detected that both of the second filters 6 are attached.

FIG. 12 is a right external view of the switch device of the present invention when one filter is attached to the projector according to the present embodiment. FIG. 13 is a left external view of the switch device of the present invention when one filter is attached to the projector according to the present embodiment. FIG. 14 is a side view showing the state of the detection switch in the switch device.
When the second filter 6 is pulled out from the state where both the filters 4 and 6 shown in FIGS. 9 and 10 are attached, one of the wings of the detection lever 29 loses its support and the detection movable portion 24 is used as the rotation axis. The detection lever 29 rotates to be in the state shown in FIGS. At this time, the detection movable unit 24 returns to the position shown in FIG. 14, that is, the origin position, and is switched off.
Hereinafter, the operation of the switch device according to the present embodiment will be described in detail.

  FIGS. 15A and 15B are explanatory views showing a state in which two filters are mounted on the projector according to the present embodiment, FIG. 15A is a diagram showing the detection switch being switched on, and FIG. 15B is a state of the detection movable unit. FIG. 2C is a schematic front view showing the projector in a state where the filter is attached and detached. FIGS. 16A and 16B are explanatory views showing a state in which the rear filter is removed from the projector according to the present embodiment, in which FIG. 16A shows a state where the detection switch is switched off, and FIG. 16B shows a state of the detection movable portion. FIG. 2C is a schematic front view, and FIG. FIGS. 17A and 17B are explanatory views showing a state in which the front filter is removed from the projector according to the present embodiment, where FIG. 17A shows a state in which the detection switch is switched off, and FIG. 17B shows a state of the detection movable unit. FIG. 2C is a schematic front view, and FIG. 18A and 18B are explanatory views showing a state in which both the front and rear filters are removed from the projector according to the present embodiment, FIG. 18A is a diagram showing a detection switch being switched off, and FIG. 18B is a detection movable portion. FIG. 2C is a schematic front view showing the state of the projector, and FIG.

First, the projector according to the present embodiment is equipped with the first filter 4 and the second filter 6, and the first filter rib 12 and the second filter rib 14 push up both wings of the detection lever 29 to detect the detection switch. 20 is in a switch-on state (see FIG. 15). At this time, the power supply of the projector is turned on, the exhaust fan is operated, and the projector casing is thermally exhausted.
The detection movable unit 24 has moved to the upper limit point, and a biasing force is acting in the direction indicated by the arrow in FIG.
When the detection lever 29 is pushed up by the first filter rib 12 and the second filter rib 14, as shown in FIG. 15B, the detection movable portion 24 has a tapered shape in the through hole 32 of the detection lever 29. It fits loosely at a position passing through the center of the through hole 32 along the surface.
In FIG. 15B, 22 indicates the front of the detection switch body, and 24 indicates the front of the detection movable part. The same applies from FIG. 16B to FIG. 18B.

When the first filter 4 is pulled out from the projector in the state shown in FIG. 15 (see FIG. 16C), the second filter rib 14 of the second filter 6 keeps the detection lever 29 pushed up (FIG. 15). 16 (b)), as the first filter 4 is pulled out, that is, as the first filter rib 12 is pulled out, the detection lever 29 rotates about the detection movable portion 24 as a rotation axis, and the detection movable portion 24 is biased. To return to the origin position, and the detection switch 20 is switched off (see FIG. 16A). At this time, the power of the projector is turned off and the exhaust fan stops. Since the detection movable part 24 has returned to the origin position, the urging force is not acting.
When one wing of the detection lever 29 is pushed up by the second filter rib 14, the detection movable portion 24 is eccentric in the downward direction of the through-hole 32 of the rotated detection lever 29 as shown in FIG. It is loosely fitted at the position.

Further, when the second filter 6 is pulled out from the projector in the state shown in FIG. 15 (see FIG. 17C), the first filter rib 12 of the first filter 4 keeps the detection lever 29 pushed up. (See FIG. 17 (b)), as the second filter 6 is pulled out, that is, as the second filter rib 14 is pulled out, the detection lever 29 rotates around the detection movable portion 24 as a rotation axis. Returning to the origin position by the urging force, the detection switch 20 is switched off (see FIG. 17A). At this time, the power of the projector is turned off and the exhaust fan stops. Since the detection movable part 24 has returned to the origin position, the urging force is not acting.
When the first filter rib 12 pushes up the other wing of the detection lever 29, the detection movable portion 24 is eccentric in the downward direction of the through-hole 32 of the rotated detection lever 29 as shown in FIG. It is loosely fitted at the position.

When both the first and second filters 4 and 6 are pulled out from the projector in the state shown in FIG. 15 (see FIG. 18C), or in the state shown in FIG. 16C or FIG. When one of the first and second filters 4 and 6 is pulled out from the projector, the detection lever 29 is lowered to return to the origin position, and the detection switch 20 is switched off (see FIG. 18A). The projector is turned off, and the exhaust fan stops. Since the detection movable part 24 has returned to the origin position, the urging force is not acting.
When the first filter rib 12 and the second filter rib 14 do not push up both wings of the detection lever 29, as shown in FIG. 32 is loosely fitted at a position eccentric in the upward direction.

In the present embodiment having such a configuration, when one of the first filter rib 12 and the second filter rib 14 abuts against the detection lever 29 and pushes up, or the first filter rib 12 and the second filter rib 14. When both are not in contact with the detection lever 29, the detection switch 20 performs a switch-off operation. The detection switch 20 performs the switch-on operation only when both the first filter rib 12 and the second filter rib 14 are in contact with the detection lever 29 and pushed up.
Therefore, in this embodiment, when the filter is pulled out, even if one or both of the two filters are pulled out, the switch is turned off with one detection switch and the power is turned off, so the filter is not attached. It is possible to prevent problems caused by using the device in the state.

  In the present embodiment, the switch device of the present invention is applied to the projector, and the first filter and the second filter are described as examples of the detected object. However, the present invention is not limited to this example. It can be applied to a device that detects an object to be detected and controls on / off of a power source or the like. For example, it can be applied to a personal computer, a hard disk, a recorder, and the like.

It is an external view which shows attachment / detachment of the filter of the projector which concerns on this Embodiment. It is a front view of the filter concerning this embodiment. It is a partial external view which shows the 1st and 2nd filter rib which concerns on this Embodiment. It is an external view which shows the detection switch which concerns on the switch apparatus of this invention used in this Embodiment. It is an external view of the bracket of the switch apparatus for projectors concerning this Embodiment. It is AA sectional drawing of Fig.5 (a). It is an external view which shows the switch apparatus of this invention attached in the projector housing | casing which concerns on this Embodiment. It is the schematic which shows how to attach the detection switch which concerns on this Embodiment. It is a right external view of the switch device of the present invention when two filters are mounted on the projector according to the present embodiment. It is a left external view of the switch device of the present invention when two filters are attached to the projector according to the present embodiment. It is a partial side view which shows the state of a detection switch. It is a right external view of the switch device of the present invention when one filter is attached to the projector according to the present embodiment. It is a left external view of the switch device of the present invention when one filter is attached to the projector according to the present embodiment. It is a side view which shows the state of the detection switch in a switch apparatus. It is explanatory drawing which shows the state with which both the filters were mounted | worn with the projector which concerns on this Embodiment. It is explanatory drawing which shows the state which extracted the back filter from the projector which concerns on this Embodiment. It is explanatory drawing which shows the state which removed the front filter from the projector which concerns on this Embodiment. It is explanatory drawing which shows the state which extracted both the front and back both filters from the projector which concerns on this Embodiment.

Explanation of symbols

Reference Signs List 4 first filter 6 second filter 12 first filter rib 14 second filter rib 20 detection switch 22 detection switch main body 24 detection movable part 25 protrusion 29 detection lever 30 switch device 32 through hole 34 edge 40 bracket 42 substrate 44 U-shaped member 46 L-shaped member 48 Z-shaped member 50 Grooves 52, 54 Protrusion 55 Air gap 56 First detection hole 58 Second detection hole

Claims (14)

A detection switch that performs a switch operation by detecting each of the first detection object and the second detection object, and a bracket that carries the detection switch;
The detection switch performs a switch-off operation when detecting one of the first and second objects to be detected or when not detecting both the first and second objects to be detected, And a switch device that is configured to perform a switch-on operation only when both the second detection target and the second detection target are detected. The detection switch protrudes from one surface of the detection switch body and is loosely fitted with a detection movable portion biased so as to switch from a switch-on operation position to a switch-off operation position with the detection movable portion as a rotation shaft. A rotatable detection lever,
The detection movable portion is configured to perform a switch-off operation by detecting one of the first and second detection objects and rotating the detection lever. The switch device described. The detection switch protrudes from one surface of the detection switch body and is loosely fitted with a detection movable portion biased so as to switch from a switch-on operation position to a switch-off operation position with the detection movable portion as a rotation shaft. A rotatable detection lever,
When both the first and second detection objects are not detected, the detection movable portion performs a switch-off operation, and both the first and second detection objects are detected and the detection lever is detected. The switch device according to claim 1, wherein the detection movable unit performs a switch-on operation by moving to a position where a switch-on operation of the unit is performed. The detection switch has flat side surfaces and positioning protrusions provided on one side surface,
The bracket includes a substrate and an L-shaped member and a Z-shaped member that are erected on the substrate,
The Z-shaped member has a groove into which the protrusion is fitted,
4. The L-shaped member and the Z-shaped member are configured such that the protrusion is fitted in the groove to sandwich the detection switch. 5. Switch device.   5. The switch device according to claim 4, wherein the L-shaped member and the Z-shaped member have a flange-shaped protrusion at an inner edge of each end of the L-shaped member and the Z-shaped member. The bracket has a U-shaped member erected on the substrate, and the U-shaped member is provided through a gap at a position facing the L-shaped member and the Z-shaped member,
The switch device according to claim 4, wherein the detection lever is disposed in the gap. The first object to be detected has a first protrusion, and the second object to be detected has a second protrusion.
The substrate has a hole in which one of the first protrusion and the second protrusion enters and exits in response to the attachment / detachment of the detected body at a position symmetrical to the detection movable part into which the detection lever is loosely fitted. The switch device according to claim 1, wherein the switch device is provided.   The said detection lever has a through-hole with respect to the said rotating shaft, and has the edge part protruded cylindrically around this through-hole. Switch device.   The switch device according to claim 8, wherein the through hole of the detection lever is formed in a tapered shape along the insertion direction of the detection movable portion.   The switch device according to any one of claims 1 to 9, wherein the detection lever has curved ends on both wings. A power source, a detachable first filter and a second filter that are provided at an intake port of the housing and filter outside air, and an exhaust fan that sucks air through the filter and makes the inside of the housing negative pressure In the electrical equipment provided,
The switch device according to any one of claims 1 to 10, wherein the first and second filters are used as the first and second detected bodies in the housing.
The first object to be detected in the switch device is the first filter, and the second object to be detected is the second filter,
The switch device is configured to automatically disconnect the power source by detecting the disconnection of either the first filter or the second filter, or the disconnection of both, and performing a switch-off operation. Electrical equipment characterized by that.   12. The electric device according to claim 11, wherein the detection switch automatically turns on the power supply by detecting mounting of both the first and second filters and performing a switch-on operation. . A fan that sucks outside air into the housing and exhausts it,
In a projector including a first filter and a second filter for filtering outside air sucked into a housing,
The switch device according to any one of claims 1 to 10, wherein the first and second filters are used as the first and second detected bodies in the housing.
The first object to be detected in the switch device is the first filter, and the second object to be detected is the second filter,
The switch device is configured to stop the fan by detecting the separation of one or both of the first and second filters or performing both switch-off operations. Projector.   One detection switch in the switch device is configured to start the operation of the fan by detecting mounting of both the first and second filters and performing a switch-on operation. The projector according to claim 13.

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