JP2002341444A - Safety device for liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for liquid crystal projector capable of locking an interlocking member 5 of the closed state of a 2nd opening 1b1 for passing a power supply connector in the detached state of a cover body 2 with simple constitution simplifying the shapes of respective members and capable of preventing the 2nd opening 1b1 from being opened by moving it by a hand or the like. SOLUTION: The interlocking member 5 is formed with a sliding plate 5, a locking member 8 for locking the slide plate 5 of the closed state of the 2nd opening 1b1 in the detached state of the cover body 2 is arranged, a groove part 2a2 for storing the upper end part of the slide plate 5 is formed at the cover part 2, and a projection part 2b1 for pressing the locking member 8 is formed at the cover body 2. When the cover body 2 is mounted, the locking member 8 is moved by the pressure of the projection part 2b1, the sliding plate 5 is unlocked and moved, so that the 2nd opening 1b1 is opened and the upper end part of the sliding plate 5 is stored in the groove part 2a2, locking the cover body 2 so as not to open it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which the lid cannot be opened and closed when the power is turned on to ensure safety when replacing the lamp by opening and closing the lid of a liquid crystal projector. The present invention relates to a safety device for a liquid crystal projector in which a lid is locked so as not to be opened when a power connector is attached to an inlet, and a power connector cannot be attached to the inlet when the lid is removed.

[0002]

2. Description of the Related Art Conventionally, a first opening for inserting and removing a lamp is provided in a part of a top surface and a back surface of a housing, and the first opening has a substantially L-shaped cross section including a top plate and a side plate. The lid is detachably attached, and the lamp, liquid crystal panel, optical parts such as mirrors and prisms, and device parts such as a power supply part are housed in the housing, and the device part is provided with an inlet. A power connector attached to an end of a power cord through a second opening provided at a lower rear portion of the housing at the same inlet to detachably supply power to the device unit; In the state where is attached to the inlet, the lid is locked by an interlocking member so as not to open,
A safety device for a liquid crystal projector in which the second opening is closed by the interlocking member so that the power connector cannot be attached to the inlet when the lid is removed has been considered. However, in this configuration, the second opening through which the power connector is passed can be opened by moving the interlocking member by hand or the like in a state in which the lid is detached, so that the user can connect the inlet to the inlet. There is a problem that power can be supplied by attaching a power connector, and there is a risk of electric shock.

As a safety device for preventing such a danger, for example, as shown in FIGS. 4 to 6, the interlocking member is provided with a guide plate fixed to the back of the lower part of the first opening of the housing. It is formed of a sliding plate having a guide hole corresponding to a guide pin and slid up and down. The sliding plate is urged upward by a spring or the like, and an upper end of the guide hole of the sliding plate is formed. A lock portion bent inward to form a lock surface, and further bent upward to form a substantially Z-shape; and a distal end of the guide plate facing the lock portion outward (the slide plate). (In a direction away from the sliding plate) in a substantially Z-shape, and both sides of an upper vertical surface thereof are bent inward to form a bearing portion. A seesaw plate having a claw portion for locking the shaft is pivotally supported, and the claw portion is urged against the sliding plate by a coil spring. When the lid is removed, the sliding plate is locked with the second opening closed by the first locking mechanism including the existing seesaw portion, and the guide hole of the sliding plate is closed. A slit is formed in a lock surface formed by bending an upper end inward, and a second lock mechanism configured to insert the claw portion into the slit is provided.
Unless the first lock mechanism is locked and the second lock mechanism is not released, it is impossible to release the first lock mechanism and move the sliding plate to open the second opening. Such a safety device for a liquid crystal projector is disclosed in Japanese Patent Application Laid-Open No. H11-202407. FIG. 4 is a schematic external view of a conventional liquid crystal projector, and FIG. 5 is a view showing one embodiment of a conventional safety device for a liquid crystal projector. FIG. FIGS. 6 (B) and 6 (C) are perspective views of main parts as viewed from the front, FIG. 6 is a cross-sectional view of the main parts of a conventional example, FIG. This shows a state where the lid is attached.

[0004]

However, in a conventional safety device for a liquid crystal projector, a slit is formed in a lock surface formed by bending an upper end portion of a sliding plate, and furthermore, the slit is bent upward to be substantially bent. Formed in a Z-shape, the tip of the guide plate is bent in a substantially Z-shape, and the upper part is bent to form a bearing,
The seesaw plate formed with a claw portion for locking the sliding plate on the bearing portion is pivotally supported, and the claw portion is inserted into the slit.
There is a problem in that the shape of each member and the lock mechanism are complicated, and that processing and production take time.

Accordingly, in the present invention, in order to solve the above-mentioned problems, the shape of each member is simplified and the structure is simplified, and the second opening for passing the power connector is closed when the lid is removed. It is an object of the present invention to provide a safety device for a liquid crystal projector in which a sliding plate in a locked state is locked so that the sliding plate cannot be easily moved by hand or the like to open a second opening.

[0006]

In order to achieve the above object, a first method of inserting and removing a lamp from the top and back of the housing is described.
An opening having a substantially L-shaped cross section formed by a top plate and a side plate is removably attached to the first opening, and the lamp, the liquid crystal panel, the mirror, the prism, and the like are mounted in the housing. An optical system component, a device unit such as a power supply unit are housed, and an inlet is mounted on the device unit, and the inlet is connected to an end of a power cord through a second opening formed at a lower rear portion of the housing. The attached power supply connector is detachably attached to supply power to the device section, and in a state where the power supply connector is attached to the inlet, the lid is locked by an interlocking member so as not to open, and In a liquid crystal projector in which the lid is detached and the second opening is closed by the interlocking member so that the power connector cannot be attached to the inlet, the interlocking member is connected to the housing. The first opening is formed by a sliding plate having a guide hole corresponding to a first guide pin provided inside the lower rear surface of the lower portion of the first opening and sliding up and down or left and right. A locking member for locking the sliding plate in a state where the opening of the lid is closed, an L-shaped rib for holding the top surface of the housing on the back surface of the top end of the top plate of the lid, and the lid body; Forming a groove for accommodating the upper end of the sliding plate,
Further, a projection for pressing the locking member is formed on the lid, and when the lid is mounted, the locking member is moved by the pressing of the projection to unlock the sliding plate, and the slide is released. The second opening is opened by moving the moving plate, and the upper end of the sliding plate is housed in the groove so that the lid is locked so as not to be opened.

The sliding plate has an engagement hole for engaging the locking member, and the second opening is closed by inserting the locking member through the engagement hole. Locked. Further, the sliding plate is urged in one direction by a first urging means such as a spring or rubber, and when the power connector is attached to the inlet, the power connector is pushed against a side surface of the sliding plate. When the sliding plate is moved by contact with the power supply connector and the power connector is pulled out of the inlet, the sliding plate is moved by the urging force of the first urging means to close the second opening and to close the lid. Unlock the body. Further, the sliding plate has an insertion hole through which the power connector is inserted, and when the power connector is mounted on the inlet, the power connector is pressed against a side surface of the insertion hole to move the sliding plate. I did it.

The sliding plate is urged in one direction by a first urging means such as a spring or rubber, and the locking member moves along a second guide pin provided inside the rear surface of the housing. The power connector is pulled out of the inlet by the second urging means such as a spring or rubber, and the urging force of the first urging means is pulled out. The sliding plate moves to close the second opening and release the lock of the lid, and when the lid is removed, the locking member moves by the urging force of the second urging means. Thus, the sliding plate is locked.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a safety device for a liquid crystal projector according to the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic external view of a liquid crystal projector according to the present invention. In FIG. 1, reference numeral 1 denotes a housing having a first opening through which a not-shown lamp is inserted and removed in a part of a top surface 1a and a back surface 1b, and 2 denotes a top plate which is detachably mounted in the first opening. 2a
And a side plate 2b is a cover having a substantially L-shaped cross section.
Optical parts such as a mirror and a prism, and device parts such as a power supply part are housed. Illustration and description of the same parts as the conventional example such as the optical system of the liquid crystal projector are omitted. Reference numeral 3 denotes an AC inlet mounted on the device, and a second opening 1b1 is formed in the lower rear portion 1b of the housing 1 corresponding to the AC inlet 3. This second
Power cord 4 to AC inlet 3 through opening 1b1
A power supply connector 4a mounted at an end of the power supply unit is detachably mounted to supply power to the above-described device unit (not shown). A sliding plate 5 for locking the lid 2 in a state where the lid 2 is attached to the first opening of the housing 1 faces the second opening 1b1, and a power connector 4a is connected to the sliding plate 5. It has an insertion hole 5a to be inserted, and a second opening 1b1 formed in the lower rear portion 1b of the housing 1 corresponding to the insertion hole 5a is opened. That is, the second opening 1b1 is opened corresponding to the range in which the insertion hole 5a moves as the sliding plate 5 slides.

FIG. 2 is a view showing an embodiment of a safety device for a liquid crystal projector according to the present invention. FIG. 2 (A) is a perspective view of a main part viewed from the outside of a back surface 1b of a housing 1 on which a lid 2 is mounted. B)
FIG. 3 is a perspective view of a main part viewed from the outside of the back surface 1b of the housing 1 with the lid 2 removed, and FIG. 3 is a cross-sectional view of a main part showing an embodiment of the safety device for a liquid crystal projector according to the present invention. () Shows a state in which the lid 2 is mounted, and (B) shows a state in which the lid 2 is detached. As shown in FIGS. 2 and 3, the sliding plate 5 has a guide hole 5 b, and the guide hole is formed by two first guide pins 6 provided inside the first opening lower rear surface 1 b of the housing 1. 5b is guided so as to be slidable left and right, so as to open and close the second opening 1b1. The sliding plate 5 is urged by a first coil spring 7 in a direction to close the second opening 1b1. Reference numeral 8 denotes a locking member provided with a protruding engaging portion 8a for locking the sliding plate 5 in a state in which the second opening 1b1 is closed, and the sliding plate 5 is an engagement member formed on the locking member 8. It has an engagement hole 5c that engages with the joint 8a. In addition, the locking member 8 has a guide hole 8b, and
The guide hole 8b slides on the second guide pin 9 provided inside the portion extending above the portion b, so as to be slidable back and forth,
It is urged by the second coil spring 10 in the direction of the rear surface of the housing 1, that is, in the direction of engaging with the sliding plate 5. The upper end of the sliding plate 5 is a lid lock portion 5d for locking the lid 2 in a state where the lid 2 is attached to the first opening of the housing 1.

An L-shaped rib 2a1 for holding the top surface 1a of the housing 1 is provided on the back surface of the top plate 2a of the cover 2 at the front end thereof. The top plate 2a of the lid 2 has a groove 2a2 for accommodating the lid lock 5d at the upper end of the sliding plate 5. Further, a projection 2b1 for pressing the engaging portion 8a of the locking member 8 is formed on the side plate 2b of the lid 2.

Next, the operation of the above configuration will be described in detail. As shown in FIGS. 2A and 3A, when the lid 2 is attached to the first opening of the housing 1, an L-shape provided on the back surface of the top plate 2a of the lid 2 is provided. Rib 2
a1 sandwiches the top surface 1a of the housing 1 and presses the engaging portion 8a of the locking member 8 by the protrusion 2b1 formed on the side plate 2b of the lid 2. The locking member 8 is moved in the direction opposite to the direction of the urging force of the second coil spring 10 due to the pressing of the protrusion 2b1, and the engagement between the sliding plate 5 and the locking member 8 is released. . The sliding plate 5 is urged by the first coil spring 7 in a direction to close the second opening 1b1.
The power supply connector 4a of the power supply cord 4 attached to the AC inlet 3 contacts the side surface of the insertion hole 5a formed in the AC inlet 3 and cannot move in the direction to close the second opening 1b1. The lid lock 5d at the upper end of the sliding plate 5 is housed in the groove 2a2 formed in the top plate 2a of the lid 2, so that the lid lock 5d is
The lid 2 is locked so that the lid 2 is not opened. In this state, the power connector 4a attached to the end of the power cord 4 is attached to the AC inlet 3 through the second opening 1b1 formed in the housing 1 and the insertion hole 5a formed in the sliding plate 5. Supplies power to the device.

In order to open the lid 2 for replacing the lamp, first, the lid 2 is attached to the AC inlet 3 through the second opening 1b1 formed in the housing 1 and the insertion hole 5a formed in the sliding plate 5. The disconnected power connector 4a is removed. Then, the sliding plate 5 is moved by the urging force of the first coil spring 7 to close the second opening, and the lid locking portion 5d of the sliding plate 5 is formed in the groove formed in the top plate 2a of the lid 2. 2a2, the lock of the lid 2 is released, and the movement of the lid 2 is not interrupted, so that the lid 2 can be moved horizontally to be detached and removed from the first opening of the housing 1.

As shown in FIGS. 2 (B) and 3 (B), when the cover 2 is detached from the first opening of the housing 1, a projection 2b1 formed on the side plate 2b of the cover 2 is provided. As a result, the pressing of the locking member 8 against the engaging portion 8a is stopped, and the locking member 8 moves in the direction of the rear surface of the housing 1, that is, the direction of engagement with the sliding plate 5 by the urging force of the second coil spring 10. , The engaging portion 8a is inserted into and engaged with the engaging hole 5c of the sliding plate 5,
The sliding plate 5 is locked and locked with the second opening 1b1 closed. In this state, the power connector 4a cannot be attached to the AC inlet 3.

Next, in order to mount the lid 2, the top plate 2a of the lid 2 is placed in alignment with the first opening of the housing 1, and is moved horizontally to move the top plate 2a of the lid 2. L provided on the back of the tip
When the U-shaped rib 2a1 is inserted into the back surface of the top surface 1a of the housing 1, the protrusion 2b1 formed on the side plate 2b of the lid 2 is inserted into and engaged with the engagement hole 5c of the slide plate 5. The engaging portion 8a of the locking member 8 is pressed. The locking member 8 moves in the direction opposite to the direction of the urging force of the second coil spring 10 by the pressing of the protrusion 2b1, and the engagement between the sliding plate 5 and the locking member 8 is released. The lock of the sliding plate 5 is released, but the sliding plate 5
Of the first coil spring 7 in a direction to close the opening 1b1. In this state, connect the power connector 4a to the AC
To attach the power supply connector 4a to the inlet 3, the sliding plate 5 is moved by pressing the power connector 4a against the side surface of the insertion hole 5a formed in the sliding plate 5 through the second opening 1b1 formed in the housing 1. The power supply connector 4a is attached to the AC inlet 3 by opening the second opening 1b1. The sliding plate 5 has the second opening 1
When the b1 is moved in the opening direction, the lid lock 5d at the upper end of the sliding plate 5 is housed in the groove 2a2 formed in the top plate 2a of the lid 2, so that the lid lock 5d is closed. 2 is blocked, the lid 2 is locked, and the lid 2 is not opened.

In the above embodiment, the sliding plate 5 has been described as being slidable left and right. However, the sliding plate 5 may be moved up and down, and a coil spring is used as an urging means. It may be rubber.

[0017]

According to the safety device for a liquid crystal projector according to the present invention as described above, the shape of each member is simple and simple, and the processing and production time can be shortened. Since the interlocking member is locked in a state where the second opening for passing the power connector is closed in a state where the body is removed, the interlocking member can be moved to open the second opening unless the lock is released. Power supply cannot be supplied by attaching a power connector to the AC inlet, so even if you insert your fingers inside the housing when replacing the lamp, you may touch the live parts and get an electric shock, or the lamp may be turned on No burns. In addition, since a projection for unlocking the interlocking member is formed on the lid and the lock is released when the lid is attached, the lid can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a schematic external view of a liquid crystal projector according to the present invention.

FIG. 2 is a view showing an embodiment of a safety device for a liquid crystal projector according to the present invention, wherein FIG. 2 (A) is a perspective view of a main part viewed from the outside of a back surface 1b of a housing 1 on which a lid 2 is mounted, and FIG. FIG. 3 is a perspective view of a main part viewed from the outside of the back surface 1b of the housing 1 from which the lid 2 has been removed.

3A and 3B are cross-sectional views of a main part showing an embodiment of a safety device for a liquid crystal projector according to the present invention, wherein FIG. 3A shows a state in which a cover 2 is mounted, and FIG. 3B shows a state in which the cover 2 is detached; I have.

FIG. 4 is a schematic external view of a conventional liquid crystal projector.

5A and 5B are views showing an embodiment of a conventional safety device for a liquid crystal projector, wherein FIG. 5A is a view of the back of a housing with a cover removed, and FIGS. 5B and 5C are front views. It is the perspective view of the principal part which was seen.

6A is a sectional view of a main part of a conventional example, in which FIG. 6A shows a state in which a cover is detached, and FIG. 6B shows a state in which the cover is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Top surface 1b Back surface 1b1 2nd opening 2 Lid 2a Top plate 2a1 Rib 2a2 Groove 2b Side plate 2b1 Projection 3 AC inlet 4 Power cord 4a Power connector 5 Sliding plate 5a Insertion hole 5b Guide hole 5c Engage Hole 5d Lid lock part 6 First guide pin 7 First coil spring 8 Locking member 8a Engagement part 8b Guide hole 9 Second guide pin 10 Second coil spring

Claims (5)

[Claims] A first opening for inserting and removing a lamp is formed in a part of a top surface and a rear surface of a housing, and a lid having a substantially L-shaped cross section formed by a top plate and a side plate is formed in the first opening. The body is detachably attached,
In the housing, the lamp, the liquid crystal panel, optical parts such as mirrors and prisms, and device parts such as a power supply part are housed, and the device part is provided with an inlet, and the inlet is provided at the lower rear part of the housing. A power connector attached to an end of a power cord is detachably attached to supply power to the device through a second opening formed in the power cord. A liquid crystal projector wherein the lid is locked by a member so as not to be opened, and when the lid is removed, the second opening is closed by the interlocking member so that the power connector cannot be attached to the inlet. At
The interlocking member is formed of a sliding plate having a guide hole corresponding to a first guide pin provided inside the back surface of the lower portion of the first opening of the housing and sliding vertically or horizontally. A locking member for locking the sliding plate in a state where the second opening is closed in a state in which the housing is detached, and an L-shape in which the top surface of the housing is sandwiched between the top surface of the top plate of the lid and the back surface of the top plate of the lid. A groove for accommodating the upper end of the sliding plate is formed in the lid, and a projection for pressing the locking member is formed in the lid, and the projection is formed when the lid is mounted. By pressing the portion, the locking member is moved to unlock the sliding plate, and the sliding plate is moved to open the second opening, and the upper end of the sliding plate is formed in the groove. Wherein the lid is locked to prevent the lid from being opened. Safety device of Kuta. 2. The slide plate has an engagement hole for engaging the locking member, and the second opening is closed by inserting the locking member through the engagement hole. The safety device for a liquid crystal projector according to claim 1, wherein the safety device is locked. 3. The sliding plate is made of a first material such as a spring or rubber.
When the power supply connector is attached to the inlet, the power supply connector is pressed against a side surface of the slide plate to move the slide plate,
When the power connector is removed from the inlet, the sliding plate is moved by the urging force of the first urging means to close the second opening and unlock the lid. The safety device for a liquid crystal projector according to claim 1 or 2, wherein: 4. The sliding plate has an insertion hole through which the power connector is inserted, and when the power connector is attached to the inlet, the power connector is pressed against a side surface of the insertion hole to slide the power connector. 4. A safety device for a liquid crystal projector according to claim 3, wherein the plate is moved. 5. The sliding plate is made of a first material such as a spring or rubber.
The locking member slides back and forth along a second guide pin provided inside the rear surface of the housing, and a second bias such as a spring or rubber is provided. When the power connector is pulled out of the inlet by the means, the sliding plate is moved by the urging force of the first urging means to close the second opening. When the lid is unlocked and the lid is removed, the locking member is moved by the urging force of the second urging means to lock the sliding plate. The safety device for a liquid crystal projector according to claim 1 or 2.