JP2006301175A - Lamp chamber door device and projector with the lamp chamber door device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a product high in safety inexpensively by providing a lamp chamber door to be freely rotated and by preventing the lamp chamber door from being rotated and opened unless a power cable is removed in an electronic apparatus product such as a projector. <P>SOLUTION: The lamp chamber door device includes: the lamp chamber door 3 disposed so as to be freely opened or closed by a rotating mechanism that has a rotation control shaft 5 formed from a door support part 5a and a polygonal part 5b; and a movable member 6 having a locking part 6a for locking the lamp chamber door 3 in a closed position, and a cover part 6b for covering a socket 1c provided for the power source supply cable. The lamp chamber door 3 is unlocked and opened by sliding the movable member 6 to be away from the lamp chamber door 3. The cover part 6b covers the socket 1c provided for the power supply cable, thereby preventing connection with the power supply cable. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lamp chamber door device and a projector including the lamp chamber door device, and more particularly, in an electronic device such as a projector, the power supply cable is removed when replacing a lamp unit housed in the lamp chamber. To avoid danger to the human body such as electric shock and fire and damage to the equipment due to work mistakes, and reduce the number of electronic components that make up the electronic equipment such as projectors. The present invention relates to a lamp chamber door device and a projector including the lamp chamber door device.

  In an electronic device having a built-in light source such as a projector, a lamp such as a halogen lamp or a high-pressure mercury lamp is used as a light source for projecting and displaying an image on a screen or the like. The lamp life is reduced due to the decrease. For this reason, it is necessary to replace the lamp unit periodically or at an appropriate time, and the opening of the lamp chamber in which the lamp unit is housed can be opened and closed in an electronic device such as a projector so that the lamp unit can be easily replaced. It is equipped with a lamp chamber door for replacing the lamp unit. Since replacement of the lamp unit is often performed by a general consumer, when replacing the lamp unit, foreign matters such as screws may be dropped into the projector housing due to an operation error.

FIG. 7 is a perspective view showing a procedure for replacing the lamp unit in a conventional projector having a lamp chamber door for replacing the lamp unit. FIG. 7A shows a state in which the projector is inverted when the lamp unit is replaced. FIG. 7B shows a state where the lamp chamber door is removed, and FIG. 7C shows a state where the lamp unit is removed.
As shown in FIG. 7A, the conventional lamp unit replacement procedure is performed by inverting the projector main body 101 and then detachably installing it in the lamp chamber opening of the bottom surface portion 102 as shown in FIG. 7B. Loosen the fixing screw 103e of the lamp unit door 103 for replacing the lamp unit and remove it from the bottom surface part 102, thereby removing the lamp unit 108 from the lamp chamber and replacing it with a new lamp unit as shown in FIG. It is possible to do. After replacing the lamp unit 108, the lamp unit 108 is assembled in the reverse order of removal.
In any work performed by replacing the conventional lamp unit as described above, it is not necessary to remove the power supply cable 109 from the power supply cable socket provided in the projector main body 101.

8 is a top view showing a conventional projector, FIG. 9 is a partial sectional view taken along the line AA of the projector shown in FIG. 8, and FIG. 9A shows the lamp chamber door in the closed state shown in FIG. FIG. 9B shows a case where the lamp chamber door is in the open state of FIG. 7B.
In a conventional projector provided with a lamp chamber door 103 that closes the lamp chamber opening, the lamp chamber door 103 has a bottom surface 102 so as to close the lamp chamber opening of the projector body 101 as shown in FIG. The lever 110a of the door detection switch 110 installed inside the projector main body 101 is pushed up by the switch operating piece 103g protruding from the inner surface of the lamp chamber door 103, and the door detection switch 110 is turned on. Thus, an electronic circuit housed in the projector main body 101 is connected, and the projector can be used.

  9A, when the fixing screw 103e is loosened and the lamp chamber door 103 is removed from the bottom surface portion 102 of the projector main body 101, the switch operating piece 103g escapes as shown in FIG. 9B. As a result, the lever 110a of the door detection switch 110 is pushed back in the reverse direction, the door detection switch 110 is turned off, and the electronic circuit housed therein is shut off. At this time, since the lamp unit 108 can be replaced without removing the plug provided on the power supply cable 109 from the power supply cable socket provided on the projector main body 101, power is supplied to some electronic circuits. Continue to be supplied.

In addition to the safety device at the time of replacing the lamp unit as described above, Patent Document 1 discloses that the interlocking member is locked with the inlet closed when the lid is open, and the interlocking member is moved by hand. Thus, a “double safety device for a liquid crystal projector” is disclosed in which the inlet of the inlet cannot be opened, and Patent Document 2 can prevent the user from touching the light source section that has become hot and replace the light source. A "projection type display apparatus" that can reduce the waiting time required until the time is disclosed. Patent Document 3 includes a lock unit that locks the light source unit and the cover when the light source unit is at a predetermined temperature or higher. A “projection display device” is disclosed, and Patent Document 4 discloses a “display device” in which the power source is not activated unless the lamp unit is inserted into the lamp unit insertion portion and the open / close lid is closed. A “video projector” is disclosed in which a lamp unit in which a power input terminal of a lamp and a lamp is integrally formed can be externally attached to the rear part of the projector main body, and electrical connection is made simultaneously with the mounting of the lamp unit. Yes.
JP-A-11-202407 JP 2002-139797 A JP 2002-333668 A JP 2003-149737 A Japanese Patent Laid-Open No. 5-5948

  In the projector having the lamp chamber door for replacing the conventional lamp unit as described above, it is possible to replace the lamp unit while power is continuously supplied to some electronic circuits as shown in FIGS. For this reason, foreign objects such as screws may fall into the equipment due to work mistakes, resulting in danger to human bodies such as electric shock and fire, and damage to electronic equipment such as projectors.

  The present invention has been made to solve the problems of conventional electronic devices such as projectors. The lamp chamber door is provided so as to be rotatable by a rotating mechanism, and the power supply cable to the projector main body must be removed. It is intended to ensure safety when replacing the lamp unit by preventing the lamp chamber door from rotating and opening.

  In addition, the power supply cable cannot be connected to an electronic device such as a projector unless the lamp unit door for replacing the lamp unit is rotated and closed. The purpose is to reduce the cost of electronic devices such as projectors by reducing the number of electronic components that can be configured to prevent danger to the human body such as electric shocks and fires and damage to the devices when they fall. And

  A first technical means of the present invention is a movable having a lamp chamber door that opens and closes the lamp chamber opening by a rotating mechanism, a lock portion that locks the lamp chamber door in a closed state, and a cover portion that covers a power supply cable socket. The lock portion is separated from the lamp chamber door to release the lock of the lamp chamber door so that the lamp chamber door can be opened, and the cover portion connects the socket for the power supply cable. It is a lamp chamber door device that covers and prevents connection of a power supply cable.

  According to a second technical means, in the lamp chamber door device of the first technical means, the rotation mechanism has a rotation control shaft formed with a lamp chamber door support portion and a polygonal portion, and the rotation control shaft. When the movable member to which the lamp is fixed slides so as to come in contact with and separate from the lamp chamber door, the polygonal portion is inserted into or removed from the polygonal portion insertion hole formed in the lamp chamber door. Features.

  According to a third technical means, in the lamp chamber door device of the first or second technical means, the movable member has a door lock convex portion, and the door lock convex portion is formed on the lamp chamber door. The lamp chamber door is locked by engaging with a locking recess.

  According to a fourth technical means, in the lamp chamber door device according to any one of the first to fourth technical means, the movable member is substantially L-shaped, and one piece follows a surface on which the lamp chamber door is provided. The other piece slides along the surface on which the socket for the power supply cable is provided.

  According to a fifth technical means, in the lamp chamber door device of the third or fourth technical means, the lamp chamber door has a movable member stopper, and the door is formed on the movable member when the lamp chamber door is opened. It is characterized in that the locking projection comes into contact.

  A sixth technical means is a projector including the lamp chamber door device of any one of the first to fifth technical means.

  According to the lamp chamber door device of the present invention, the movable member is provided with a cover for blocking the lamp chamber door locking structure and the power supply cable, and the movable member can be slid unless the power supply cable is removed. Because the lamp chamber door cannot be unlocked, power is not supplied to the internal electronic circuit when replacing the lamp unit. Even if foreign objects such as screws fall due to a mistake in the work, they can be replaced safely. It is possible to eliminate the need for electronic components such as a switch that operates in conjunction with the opening and closing of the lamp chamber door, thereby reducing the cost of electronic equipment such as a projector.

  In addition, according to the lamp chamber door device of the present invention, since the movable member has a stopper that prevents the movable member from operating when the lamp chamber door is pivoted open, the movable member operates in a delusion when the lamp unit is replaced. Therefore, it is possible to safely replace the lamp unit.

In the lamp chamber door device of the present invention and an electronic device such as a projector equipped with the lamp chamber door device, a lamp chamber door for replacing the lamp unit is provided rotatably, and a power supply cable for the electronic device such as a projector is provided. If the lamp is not removed, the lamp chamber door will not rotate and will not open, and if the lamp replacement door is not closed and closed, the power supply cable cannot be connected to an electronic device such as a projector. The purpose of this is to provide a product with high performance at low cost, and the structure of the lamp chamber door device for that purpose is rotated by a rotation mechanism having a rotation control shaft formed with a lamp chamber door support portion and a polygonal portion. A movable member having a lamp chamber door provided freely, a lock portion that locks the lamp chamber door in a closed state, and a cover portion that covers a socket for a power supply cable The lock portion slides away from the lamp chamber door, thereby unlocking the lamp chamber door and enabling the lamp chamber door to be opened, and the cover portion includes the power supply cable. The power socket is covered to prevent connection of the power supply cable.
Hereinafter, the lamp chamber door device and the projector of the present invention will be described based on examples.

  FIG. 1 is a perspective view showing a procedure for replacing a lamp unit housed in a lamp chamber in a projector having a lamp chamber door according to a first embodiment of the present invention. FIG. 1 (B) shows a state where the power supply cable is removed, FIG. 1 (C) shows a state where the lock mechanism of the lamp chamber door is released, and FIG. 1 (D) shows a state where FIG. 1 (E) shows the state when the lamp chamber door is rotated by 90 ° when the lamp unit is replaced, FIG. 1 (E) shows the state when the lamp chamber door is rotated by 90 °, and FIG. 1 (F) shows the lamp unit. The state where is removed is shown.

  In the projector provided with the lamp chamber door 3, the general procedure for replacing the lamp unit housed in the lamp chamber is as shown in FIGS. 1 (A) to 1 (F). In FIG. After the reversal, the power supply cable 9 is detached from the projector main body 1 in FIG. Next, the fixing screw 3e of the lamp chamber door 3 that is rotatably attached to cover the lamp chamber opening 2b formed in the bottom surface portion 2 of the projector main body 1 is loosened, and the movable member 6 is moved in FIG. Move in the arrow direction X to disengage the locking recess 3 c formed on the lamp chamber door 3 from the locking projection 6 c formed on the movable member 6. At this time, the power supply cable socket 1c is covered with the cover 6b of the movable member 6 at the same time as the lock is released, and the plug 9a of the power supply cable 9 cannot be connected. Next, the lamp chamber door 3 is rotated and opened in FIG. 1D, and the lamp chamber door 3 is rotated to a predetermined position in FIG. Then take out the lamp unit 8 and replace it with a new lamp unit.

FIG. 2 is a top view illustrating the projector according to the first embodiment, and FIG. 3 is a bottom view illustrating the projector according to the first embodiment with the projector reversed and the lamp chamber door and the movable member being disassembled.
The projector according to the first embodiment includes a lamp unit, an optical unit, an optical modulation element such as a DMD (Digital Micromirror Device), a liquid crystal panel, a circuit board, a projection lens, and the like in the projector main body 1. 2 has a height adjusting leg 2a, and a lamp chamber opening 2b is formed corresponding to the position of the lamp unit. The lamp chamber opening 2b is opened when the lamp unit 8 housed in the lamp chamber is replaced. A lamp chamber door 3 is provided so as to be openable and closable around one side. Further, a projection lens 1a is provided on the front plate of the projector body 1, and a power supply cable socket 1c for connecting a power supply cable 9 for supplying power to the projector in a recessed portion 1b formed on the rear plate. Is provided.

The configuration of the lamp chamber door device for replacing the lamp unit of the projector according to the first embodiment will be described.
FIG. 4 is an enlarged perspective view showing the lamp chamber door device when the lamp chamber door is rotated by 60 °.
The lamp chamber door device connects a lamp chamber door 3 that closes a lamp chamber opening 2b formed in the bottom surface portion 2 of the projector body 1, a lock portion 6a that locks the lamp chamber door 3 in a closed state, and a power supply cable 9. It consists of the movable member 6 which has the cover part 6b made impossible. The lamp chamber door 3 protrudes and retracts from a rotation shaft hole 3a for inserting the rotation shaft 4 along one side and a polygonal portion 5b (eg, hexagon) of the door rotation control shaft 5 described later. It has a polygonal part insertion hole 3b for free insertion, and one end side is rotatably supported on the bottom surface part 2 by a rotating shaft 4 and an E ring 4a, and the other end side of the door rotation control shaft 5 is provided. While being supported by the door support portion 5a, the polygonal portion 5b is removably inserted into the polygonal portion insertion hole 3b of the lamp chamber door 3, and is attached rotatably. Therefore, when the door rotation control shaft 5 is pulled out from the polygon portion insertion hole 3 b of the lamp chamber door 3, the lamp chamber door 3 is rotatable with respect to the door rotation control shaft 5.
Further, a locking recess 3c is formed adjacent to the polygonal portion insertion hole 3b on the surface of the lamp chamber door 3, and a lamp chamber door fixing screw 3e for fixing the lamp chamber door 3 to the bottom surface portion 2 is fixed to the lamp chamber door. It is held by an E-ring 3f for preventing screw dropout.

The movable member 6 has a substantially L-shaped cross section, a lock portion 6a that is one piece is attached to the bottom surface portion 2, and a cover portion 6b that is the other piece is provided with a power supply cable socket 1c. Attached to a recessed portion 1b provided on the back surface of the socket is slidably attached between a position where the socket 1c is covered and a position where the socket 1c is not covered. The lock portion 6a is provided with a door lock convex portion 6c, and the door lock convex portion 6c engages with a lock concave portion 3c formed in the lamp chamber door 3 at the time of locking.
Further, a portion of the lock portion 6a corresponding to the rotation center of the lamp chamber door 3 is bent in a convex shape to attach the door rotation control shaft 5, and a fixing screw for the door rotation control shaft is provided in this portion. A door rotation control shaft 5 is attached using 5c. Therefore, when the movable member 6 is slid, the door rotation control shaft 5 slides with respect to the lamp chamber door 3 simultaneously with the movable member 6.

  The movable member 6 slides along the bottom surface portion 2 of the projector body 1 so as to be able to come into contact with and separate from the lamp chamber door 3, and the sliding mechanism at that time is formed with two long holes 2 c in the bottom surface portion 2. The two movement amount adjusting spacers 7 are inserted into the two rows of long holes 2c from the inside of the projector body 1 and fixed to the back surface side of the movable member 6 using the spacer fixing screws 7a. The movement amount adjusting spacer 7 is used to hold the bottom surface portion 2 and adjust the movement amount of the movable member 6.

FIG. 4 is an enlarged partial perspective view showing the relationship among the lamp chamber door, the movable member, and the power supply cable when the lamp chamber door is rotated by 60 °.
As shown in FIG. 4, when the lamp chamber door 3 is rotated and opened, the door lock convex portion 6 c remains on the back side of the lamp chamber door 3 even if the movable member 6 is returned to the original closed position. It is possible to prevent the plug 9a of the power supply cable 9 from being inserted into the power supply cable socket 1c and connected to the movable member stopper 3d. After replacing the lamp unit 8, the lamp chamber opening 2b is closed by the lamp chamber door 3 in the reverse procedure, and the movable member 6 is slid to move the cover 6b from above the power supply cable socket 1c. The projector 9 is assembled by inserting the plug 9a of the power supply cable 9 into the power supply cable socket 1c.

FIG. 5 is a partial cross-sectional view when the projector is inverted with the lamp chamber door locked, FIG. 5A shows a partial cross-section BB in FIG. 2, and FIG. A CC partial cross section is shown.
6 is a partial cross-sectional view of the projector when the lamp chamber door is unlocked, and FIG. 5A is a partial cross-sectional view taken along the line BB in FIG. 2, and FIG. The CC partial cross section in is shown.

  As shown in FIG. 5A, in the normal operation state or the power supply cable connection state, the polygonal portion 5b (for example, hexagonal shape) of the rotation control shaft 5 is the polygonal portion insertion hole 3b of the lamp chamber door 3. And the door lock projection 6c rides on the lock recess 3c of the lamp chamber door 3 and is locked so that the lamp chamber door 3 cannot be rotated and opened.

  Here, in order to rotate and open the lamp chamber door 3, the movable member 6 is slid in the arrow direction X as shown in FIG. The polygonal portion 5b of the rotation control shaft 5 escapes from the rectangular portion insertion hole 3b, but the movement amount of the lamp chamber door support portion 5a is controlled by the movement amount adjusting spacer 7 from the rotation shaft hole of the lamp chamber door 3. Therefore, the lock projection 6c is disengaged from the lock recess 3c, so that the lamp chamber door 3 can be rotated.

It is a perspective view which shows the procedure which replaces | exchanges the lamp unit accommodated in the lamp chamber in the projector provided with the lamp chamber door of Example 1 of this invention. 1 is a top view illustrating a projector according to Embodiment 1. FIG. FIG. 3 is a bottom view showing the lamp chamber door and the movable member in an exploded manner by inverting the projector according to the first embodiment. It is a perspective view which expands and shows a lamp chamber door apparatus when a lamp chamber door is rotated 60 degrees. It is a fragmentary sectional view when a projector is reversed in the locked state of a lamp chamber door. It is a fragmentary sectional view when a projector is reversed in the unlocking state of a lamp chamber door. It is a perspective view which shows the procedure which replaces | exchanges a lamp unit in the projector provided with the conventional lamp chamber door. It is a top view which shows the conventional projector. It is an AA cross-section partial view of the projector shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector main body, 1a ... Projection lens, 1b ... Concave part, 1c ... Power supply cable socket, 2 ... Bottom part, 2a ... Height adjustment leg, 2b ... Lamp chamber opening, 3 ... Lamp chamber door, 3a ... Time Moving shaft hole, 3b ... Polygon part insertion hole, 3c ... Locking recess, 3d ... Moving member stopper, 3e ... Fixing screw, 3f ... Fixing screw drop-off prevention E-ring, 4 ... Rotating shaft, 4a ... E-ring, 5 ... door rotation control shaft, 5a ... door support, 5b ... polygon, 5c ... control shaft fixing screw, 6 ... movable member, 6a ... lock part, 6b ... cover part, 6c ... locking convex part, 7 ... moving amount adjusting spacer, 7a ... spacer fixing screw, 8 ... lamp unit, 9 ... power supply cable, 9a ... plug, 110 ... door detection switch, 110a ... lever.

Claims (6)

  A lamp chamber door that opens and closes the lamp chamber opening by a rotation mechanism; a movable member having a lock portion that locks the lamp chamber door in a closed state; and a cover portion that covers a socket for a power supply cable. The lamp chamber door is unlocked by being separated from the chamber door, the lamp chamber door can be opened, and the cover portion covers the power supply cable socket to prevent connection of the power supply cable. A lamp chamber door device characterized by that. The lamp chamber door device according to claim 1,
The rotation mechanism has a rotation control shaft formed with a lamp chamber door support portion and a polygonal portion, and the movable member to which the rotation control shaft is fixed contacts and separates from the lamp chamber door. The lamp chamber door device, wherein the polygonal portion is inserted into or removed from a polygonal portion insertion hole formed in the lamp chamber door by sliding. The lamp chamber door device according to claim 1 or 2,
The movable member has a door lock convex portion, and the door lock convex portion engages with a lock concave portion formed in the lamp chamber door to lock the lamp chamber door. Lamp room door device. The lamp chamber door device according to any one of claims 1 to 3,
The movable member is substantially L-shaped, one piece slides along the surface where the lamp chamber door is provided, and the other piece slides along the surface where the power supply cable socket is provided. Lamp room door device characterized by. The lamp chamber door device according to claim 3 or 4,
The lamp chamber door device has a movable member stopper, and the door lock convex portion formed on the movable member contacts when the lamp chamber door is opened.   6. A projector comprising the lamp chamber door device according to claim 1.

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