JP3528522B2 - LCD projector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector using a liquid crystal light valve, and more particularly to a safety mechanism which allows a lamp unit to be attached and detached only when AC (commercial power) input is cut off.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid crystal projector in which an image of a liquid crystal light valve is enlarged and projected to obtain a large screen image.

FIG. 5 is a diagram showing a main part structure of the liquid crystal projector, and is a rear perspective view (a) of the appearance and a perspective view (b) showing attachment / detachment of the lamp unit and the plug. Figure 5 (a)
The external rear perspective view shown in FIG. 1 is a liquid crystal projector in which an image of the liquid crystal light valve housed in the case 1 is enlarged and projected forward by the projection lens 2 to obtain a large screen image on a screen (not shown). A lamp unit for irradiating the liquid crystal is provided inside the storage chamber cover 3 provided at the rear portion of 1 or the like.

As shown in FIG. 5B, a lamp unit 4 including a light source, such as a metal halide lamp, and a reflecting mirror having a parabolic surface is provided in a storage chamber provided in a rear portion of the case 1 or the like. Be attached to. Specifically, for example,
With the power plug 5a provided on the rear part of the lamp unit 4 connected to the inlet 5b provided on the wall 11 in the storage room,
The lamp unit 4 is fixed in the storage chamber. And
As shown in FIG. 5A, the entrance of the storage chamber is covered with the storage chamber cover 3.

By the way, in order to obtain a bright magnified projection image, it is necessary for a metal halide lamp or the like to maintain a predetermined high brightness. However, the luminance of a metal halide lamp or the like decreases with the lapse of time. Therefore, the lamp unit 4, which is the light source, must be regularly replaced every predetermined use time. In the past, this replacement was to be performed by a service person specializing in liquid crystal projectors from the viewpoint of safety standards, and electric shock accidents were prevented. Alternatively, the liquid crystal projector is sent to the manufacturer and the lamp unit 4 is replaced there.

Therefore, the conventional liquid crystal projector has a problem that the replacement cost of the lamp unit 4 is high and the maintenance cost is high. In addition, there was a problem that the liquid crystal projector could not be used while sending it to the manufacturer.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal projector capable of preventing electric shock and allowing replacement of a lamp unit.

[0008]

To achieve the above object, in a liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering an entrance of the chamber is attached to the case, the chamber is provided. A cover that covers the inlet of the case covers the inlet provided in the same case, and an insertion hole having a size substantially equal to the outer shape of the inlet opening is provided in the cover, and a power plug having a protrusion at the rear part is provided through the insertion hole. Connect to the inlet.

Further, in a liquid crystal projector in which a chamber for mounting the lamp unit is provided in the case, and a cover for covering the entrance of the chamber is attached to the case, the chamber for mounting the lamp unit in the case is substantially rectangular. A concave groove is provided along the upper part of the entrance of the cover, and the upper side of the substantially rectangular cover has a U-shaped cross section, and the lower side has a stepwise shape that bends forward. An insertion hole having an outer shape substantially equal to the opening outer shape of the inlet is provided at a position corresponding to the inlet, and the power plug is connected to the inlet through the insertion hole.

Further, in a liquid crystal projector in which a chamber for mounting a lamp unit is provided in the case, and a cover for covering the entrance of the chamber is attached to the case, the chamber for mounting the lamp unit in the case is substantially rectangular. A downward groove is provided along the upper part of the entrance of the cover, and the upper side of the substantially rectangular cover is bent in a stepwise manner, and a substantially square concave inlet is provided immediately below the cover at the lower edge of the entrance, and the lower end of the cover is formed. Is provided with a stopper having a substantially U-shaped cross-section sandwiched between the upper wall surface and an upper surface having a two-step thickness and a protrusion at the lower surface tip, and a power plug is attached to the inlet so that the stopper has a two-step thickness. The thick portion pushes up the cover, and the top end of the cover is loosely inserted into the groove above the entrance of the lamp unit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION With the above construction, the projection on the rear of the power plug connected to the inlet hits the insertion hole of the cover that covers the entrance of the chamber in which the lamp unit is mounted. You can open the cover after removing it.

Further, the power plug connected to the inlet hits the insertion hole of the cover for covering the entrance of the chamber in which the lamp unit is mounted, and the vertical movement of the cover is restricted. Therefore, the cover is removed after removing the power plug. Can be opened.

Further, the power plug connected to the inlet pushes the stopper forward, and the two-step thick portion of the stopper pushes up the cover and restricts the downward movement of the cover. The cover can be opened after removing the plug.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal projector according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged view of a main part (a) showing a first embodiment of a liquid crystal projector according to the present invention,
It is a principal part sectional view (B) from the A direction. A storage chamber 4a for mounting the lamp unit is provided in the case 1 of the liquid crystal projector, and a cover 3 for covering the entrance of the storage chamber 4a is provided.
In addition to covering the inlet 6b provided in the case 1, the cover 3 is provided with an insertion hole having a size substantially equal to the outer shape of the inlet opening, and a power plug 6a provided with a projection 6c at the rear portion is provided in the inlet 6b through the insertion hole. Connecting.

A concave groove 10 is provided along the upper portion of the entrance of the storage chamber 4a of the case 1 having a substantially rectangular shape, and the upper side of the substantially rectangular cover 3 is formed into a U-shaped cross section 30 and the lower side is bent forward. The stepped portion is formed, and an insertion hole having an outer shape substantially equal to the opening outer shape of the inlet 6b is provided at a position corresponding to the inlet 6b, and the power source plug 6a is connected to the inlet 6b through this insertion hole. Therefore, inlet 6b
The projection 6c at the rear of the power plug 6a connected to the
Since it hits the insertion hole of the cover 3 covering the entrance of 4a, the cover can be opened after removing the power plug 6a.

Furthermore, since the power plug 6a connected to the inlet 6b hits the insertion hole of the cover 3 which covers the entrance of the storage chamber 4a and regulates the vertical movement (arrow) of the cover, the concave groove of the case 1 is formed. 10 and the U-shaped section 30 of the cover 3 are sandwiched, and the stepped part of the lower side of the cover 3 is locked to the corresponding part of the case 1. Therefore, it can be opened by removing the power plug 6a from the inlet 6b and then moving the cover 3 in the arrow direction.

FIG. 2 is an enlarged view (a) of a main part showing a second embodiment of the liquid crystal projector according to the present invention, and a cross-sectional view (b) of the main part from the A direction. Note that the same parts as those in FIG. A downward groove is provided along the upper part of the entrance of the storage chamber 4a of the case 1 having a substantially rectangular shape, and the upper side of the substantially rectangular cover 3 is formed as a stepped portion, and the lower side is a substantially L-shaped bottom surface that is bent forward. Along with
An insertion hole 31 is provided on the L-shaped bottom surface, a substantially square concave inlet 6b having an insertion hole is provided on the upper wall surface at the lower edge of the entrance, and the case 1 between the cover 3 and the inlet 6b is biased by a spring. Insert the shaft 7 into the insertion hole 31 of the L-shaped bottom surface.
Then, the inlet 6b was vertically installed so as to be inserted into and removed from the insertion hole of the upper wall surface.

Therefore, the step-shaped portion of the upper side of the cover 3 is sandwiched in the downward groove of the case 1, and the L-shaped bottom surface of the lower side of the cover 3 is placed on the case 1. In this state, insert the power plug 6a through the insertion hole.
When connected to 6b, the shaft 7 urged by a spring and hanging down from the inlet 6b is pushed up, and the tip of this shaft 7 is inserted into the insertion hole 31 of the L-shaped bottom surface of the cover 3,
The cover 3 is fixed to the case 1. Therefore, when the power plug 6a is removed from the inlet 6b, the spring-biased shaft 7 is removed from the insertion hole 31 of the L-shaped bottom surface, so that the cover 3 can be opened by rotating it in the arrow direction.

FIG. 3 is an enlarged view (a) of a main part showing a third embodiment of the liquid crystal projector according to the present invention, a cross-sectional view (b) of the main part from the A direction and a cross-sectional view (c) of the main part from the B direction. is there.
Note that the same parts as those in FIG. A downward groove is provided along the upper part of the substantially square entrance of the storage chamber 4a of the case 1, and a convex strip is provided at the lower part of the entrance as shown in FIG. The concave portion is formed by bending the corresponding position of the lower side forward while forming a stepped portion that is bent in the direction of. On the other hand, an inlet 6b having a substantially quadrangular concave shape is provided just below the cover 3 at the lower edge of the entrance, and the lower end of the cover 3 has a substantially U-shaped cross-section sandwiched between the upper wall surface of the inlet 6b and the upper surface is 2
A stopper 8 having a step thickness and having a protrusion on the lower end is provided.

Therefore, by mounting the power plug 6a on the inlet 6b, as shown in FIG. 3 (b), the two-step thick portion of the stopper 8 becomes the cover 3
And push the upper edge of the cover 3 loosely into the downward groove provided at the upper part of the entrance of the storage chamber 4a.
As shown in (c), the case 1
The ridges at the bottom of the entrance are pinched. Further, the cover 3 is fixed with screws. Therefore, when the power plug 6a is removed from the inlet 6b, the stopper 8 biased by the coil spring 8a is pushed outward and the stopper 8
Since the thin portion of the step is in a state immediately below the cover 3, remove the screw fixing the cover 3,
By moving the cover 3 downward, the tip of the upper side of the cover 3 is disengaged from the downward groove provided in the upper part of the entrance of the storage chamber 4a, and the concave part of the lower side is disengaged from the case 1, so that the cover 3 can be opened.

FIG. 4 is an enlarged view (a) of the main part of the liquid crystal projector according to the fourth embodiment of the present invention with the cover closed, and an enlarged view (b) of the main part with the cover open. Note that the same parts as those in FIG. Mount the lamp unit 4 in the storage room of the case 1,
A cover 3 for covering the entrance of the storage chamber is pivotally attached to the entrance of the storage chamber of the case 1 at a fulcrum 3a so as to be openable and closable.
On the cover 3 at the position corresponding to the inlet 6b in the closed state,
An insertion hole having an outer shape that is substantially the same as the outer shape of the opening of the inlet 6b is provided, and the power plug is connected to the inlet 6b through this insertion hole.

Therefore, the cover 3 is restricted in its rotational movement about the fulcrum 3a by the power plug connected to the inlet 6b through the insertion hole. Therefore, as shown in FIG. 4B, when the power plug is removed, the cover 3 can rotate (arrow) about the fulcrum 3a, and the lamp unit 4 can be taken out by pulling it out with the knob. it can. Further, as shown in FIGS. 4 (a) and 4 (b), a rotation stopper 1a for restricting the rotational movement of the cover 3 when the cover 3 is opened or closed is provided, and the rotation of the cover 3 is regulated by the rotation stopper. The inlet 6b should always be at least part of the inlet 6b in the locus of rotational movement.
Since the power plug can be attached and detached only when the cover of FIG. 4 (a) is closed, the power supply is always turned off when the lamp unit is replaced (the cover is open).

[0023]

As described above, the present invention provides a liquid crystal projector in which the power plug must be pulled out before the cover is opened to prevent electric shock and the lamp unit is replaced. Therefore, since a general user can safely replace the lamp unit in addition to a professional service person, the cost for replacing the lamp unit can be reduced and the maintenance cost can be reduced. In addition, since it can be replaced immediately on the spot, it is possible to increase the operating time of the liquid crystal projector.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part showing a first embodiment of a liquid crystal projector according to the present invention (a), a cross-sectional view of the main part from the direction A (b).
Is.

FIG. 2 is an enlarged view of a main part (a) showing a second embodiment of the liquid crystal projector according to the present invention, and a cross-sectional view of the main part from the direction A (b).
Is.

FIG. 3 is an enlarged view of a main part showing the third embodiment of the liquid crystal projector according to the present invention (a), a cross-sectional view of the main part from the direction A (b).
3A and 3B are cross-sectional views (C) of main parts from the B direction.

FIG. 4 is an enlarged view (a) of a main part of the liquid crystal projector according to a fourth embodiment of the present invention with a cover closed, and an enlarged view (b) of a main part with the cover open.

FIG. 5 is a diagram showing a main configuration of a liquid crystal projector,
It is an external back perspective view (a) and a perspective view (b) showing attachment and detachment of the lamp unit and the plug.

[Explanation of symbols]

1 case 1a 2 Projection lens 3 cover 3a fulcrum 4 lamp units 4a storage room 5a power plug 5b inlet 6a power plug 6b inlet 6c protrusion 7 shaft 8 stopper 8a coil spring 10 groove 11 walls 30 U-shaped section 31 insertion hole

Claims (8)

(57) [Claims] 1. A liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering the entrance of the chamber is attached to the case, and a cover for covering the entrance of the chamber is provided in the case. A liquid crystal projector, characterized in that, while covering the inlet, the cover is provided with an insertion hole having a size substantially equal to the outer shape of the inlet opening, and a power plug having a projection at the rear is connected to the inlet through the insertion hole. 2. A liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering an entrance of the chamber is attached to the case, wherein the chamber has a substantially rectangular shape for mounting the lamp unit. A concave groove is provided along the upper part of the entrance of the cover, the upper side of the approximately rectangular cover is bent in a U shape in section, and the lower side is bent in a stepwise shape, and at the position corresponding to the inlet, the outer shape of the inlet is formed. A liquid crystal projector characterized in that an insertion hole having a substantially equal outer shape is provided, and a power plug is connected to the inlet through the insertion hole. 3. A liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering an entrance of the chamber is attached to the case, wherein the chamber has a substantially rectangular shape for mounting the lamp unit. A downward groove is formed along the upper part of the entrance of the, and the upper side of the substantially rectangular cover is a stepped part that is bent forward.
The bottom side is formed into a substantially L-shaped bottom surface that is bent forward, an insertion hole is provided in the L-shaped bottom surface, and a substantially square concave inlet having an insertion hole is provided in an upper wall surface at a lower edge of the entrance, and the cover is provided. A shaft urged by a spring is provided in the case between the inlets so as to be inserted into and removed from the insertion hole of the L-shaped bottom surface and the insertion hole of the upper wall surface of the inlet, and the power plug is connected to the inlet through the insertion hole. Liquid crystal projector featuring. 4. A liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering an entrance of the chamber is attached to the case, wherein the chamber has a substantially rectangular shape for mounting the lamp unit. A downward groove is provided along the upper part of the entrance and a convex strip is provided on the lower part of the entrance, and the upper side of the substantially rectangular cover is bent in a stepwise manner, and the corresponding position of the lower side is bent forward to form a concave part, A substantially square concave inlet is provided directly below the cover at the lower edge of the entrance, and has a substantially U-shaped cross section sandwiched between the upper wall surface and the lower end of the cover. By providing a stopper having the stopper and attaching the power plug to the inlet, the two-step thick portion of the stopper pushes up the cover. Of the upper side front end with loosely inserted into the inlet upper portion of the groove of the lamp unit, a liquid crystal projector projecting strip entrance bottom with recesses of the lower side of the cover is characterized in that it is clamped. 5. The liquid crystal projector according to claim 4, wherein a spring for urging the stopper is provided at the tip of the upper surface of the stopper. 6. A liquid crystal projector in which a chamber for mounting a lamp unit is provided in a case, and a cover for covering the entrance of the chamber is attached to the case. The cover is axially attached so that the entrance can be opened and closed. At the same time, in a closed state, an insertion hole having an outer shape substantially equal to the opening outer shape of the inlet is provided at a corresponding position of the substantially square concave inlet provided on the periphery of the inlet, and the power plug is connected to the inlet through this insertion hole. A liquid crystal projector characterized by that. 7. The liquid crystal projector according to claim 6, wherein the case is provided with a rotation stopper that restricts a rotational movement of the cover when the cover is open or closed. 8. The liquid crystal projector according to claim 7, wherein the inlet is arranged so that at least a part of the inlet is covered by a cover in a state in which the rotation is restricted by a rotation stopper and the state is in an open state or a closed state.