JP2010197874A - Image projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the protecting property of a reflecting mirror in a proximity projection type image projection device while further reducing the size and weight in no use. <P>SOLUTION: The projector 1 includes a movable cover 9 provided on the upper surface of a casing 2, and when the movable cover 9 is slid to the left, a reflecting mirror member 5 having a reflecting mirror 12 is automatically protruded out of the casing 2 by an interlocking mechanism no shown to lay the projector in a use state. When the movable cover 9 is returned, the reflecting mirror member 5 is also automatically returned and perfectly housed in the casing 2. The casing 2 has a rectangular parellelepiped-like compact outer shape, and the upper surface of the casing 2 is substantially closed to prevent intrusion of dust or the like in a non-use state where the reflecting mirror 5 is housed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video projection device (including a concept of an image display device, a projector, etc.) that projects video light produced by modulating light from a light source onto a projection surface. The present invention relates to a proximity projection type image projection apparatus that is used in the vicinity of the projector.

Projectors are rapidly spreading as a tool for meetings and home theaters using personal computers. Recently, small projectors that are convenient to carry along with notebook computers have been developed, and it has become possible to effectively carry out presentations and meetings on the go. Since it is small in size, it has an advantage that display information can be viewed by a large number of people anytime and anywhere regardless of the installation location.
In this type of close-projection type small projector, constituent elements such as a light source and a projection optical system are accommodated in a casing, thereby achieving compactness and portability (portability and portability).

For example, in Patent Document 1, as shown in FIG. 5, a front projection type in which a reflection mirror 101 is disposed so as to protrude below an optical axis 102 in a box-shaped housing 100 and image light is projected onto a screen 103. Projectors are described.
In Patent Document 2, a mirror mechanism section including a reflecting mirror is rotatably provided outside the projector main body, and when not in use, the mirror mechanism section is folded so as to overlap the projector main body, thereby reducing the bulk of the overall shape and compact. The structure which acquires property and portability is described.

In the above-mentioned proximity projection type small projector, in view of its usage, it is better that the outer size of the housing is smaller from the viewpoints of portability, handling, space saving, and the like.
However, in the method of fixing the reflecting mirror in a state of being completely housed in the box-shaped housing as in the invention described in Patent Document 1, as shown in FIG. 5, a useless space is generated below the lens group. Compactness cannot be promoted by reducing the height T of the housing.
In addition, as in the invention described in Patent Document 2, etc., in the system in which the mirror mechanism is provided outside the projector main body, the mirror mechanism can be improved due to an unexpected force, although it can be made compact when not in use and the portability can be improved. May cause mechanical damage to the mirror, or dust may enter through the gap of the rotating mechanism and the mirror surface may become dirty.

  An object of the present invention is to provide a video projection apparatus that can realize further reduction in size and weight when not in use and can improve the protection of a reflecting mirror.

  In order to achieve the above object, according to the first aspect of the present invention, a light source, a video display element that modulates light from the light source to generate video light, and an optical system that enlarges and projects a video from the video display element In a video projection device in which the optical system includes a lens group, and a reflection mirror member whose reflection surface for modulating the projection direction of the image is an aspherical surface, The reflection mirror member is configured to be movable, is set to a use position that protrudes out of the casing when the apparatus is used, and can be stored in the casing when the apparatus is not used.

According to a second aspect of the present invention, in the video projection device according to the first aspect, the casing is capable of opening and closing a part of the casing, and moves to an open position to move the reflecting mirror member from the lens group. A movable cover that forms a passage space for light rays to the movable body, the movable cover is moved to the open position, and the reflective mirror member is moved to the use position, thereby being in a usable state. And
According to a third aspect of the present invention, in the video projection device according to the second aspect, the amount of movement of the movable cover can project the image projection light reflected in the housing outside the housing when the device is in use. The amount of movement is such that the opening can be formed.

According to a fourth aspect of the present invention, in the video projection device according to the second or third aspect, when the device in which the reflection mirror member is housed in the housing and the movable cover is in a closed position is not used, A side surface of the housing having the movable cover is substantially sealed and substantially flat.
According to a fifth aspect of the present invention, in the video projection device according to any one of the second to fourth aspects, the movable cover and the reflective mirror member are connected so as to be interlocked, and the reflective mirror member is the movable cover. It protrudes out of the casing as it moves to the open position, and is housed in the casing as the movable cover moves to the closed position.

According to a sixth aspect of the present invention, in the video projection apparatus according to any one of the second to fifth aspects, the movement of the movable cover is linked to a power switch of the apparatus body, and the open position of the movable cover The power switch is turned on and turned off when the movable cover is retracted from the open position.
According to a seventh aspect of the present invention, in the video projection apparatus according to the fifth aspect, the video projection apparatus includes a driving unit that drives the movable cover, and the movable cover moves to an open position when the power switch of the apparatus body is turned on, and the reflection is performed. A mirror member projects out of the casing, and the movable cover moves to a closed position when the mirror member is turned off, and the reflection mirror member is housed in the casing.
According to an eighth aspect of the present invention, in the video projection device according to any one of the second to fourth aspects, an external force in a storing direction is applied to the reflective mirror member when the reflective mirror member protrudes out of the housing. When is added, only the reflection mirror member is retracted into the casing, and the movable cover is not moved.

  According to the present invention, it is possible to further reduce the size and weight when not in use, and to enhance the protection of an optical system such as a reflecting mirror.

It is a principal part schematic sectional drawing in the non-use state of the video projector which concerns on one Embodiment of this invention. It is a principal part schematic sectional drawing in use condition. It is a principal part detailed sectional view in a non-use state. It is a principal part detailed sectional view in use condition. It is a schematic block diagram which shows an example of the conventional projector.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a main part of a projector as a video projection apparatus according to the present embodiment. The projector 1 includes a housing 2 having a rectangular parallelepiped box shape as a whole, and a light source (not shown) in the housing 2 and a video display (not shown) that modulates light from the light source to generate video light. An element and an optical system 3 for enlarging and projecting an image from the image display element are accommodated.
The optical system 3 includes a lens group (lens unit) 4, a reflection mirror member 5 having a reflection mirror whose reflection surface is aspherical for modulating the projection direction of an image, and a reflection mirror 6 whose reflection surface is a plane. It is composed of Reference numeral 7 denotes an optical axis.

An opening 8 is formed in the upper surface 2-1 of the housing 2, and the opening 8 can be opened and closed by a movable cover 9 provided on the upper surface and slidable in the left-right direction (arrow M direction) in the figure. ing. The movable cover 9 moves on the stepped portion formed on the upper surface 2-1, and the position where the tip of the movable cover 9 abuts on the stepped surface 2-1a is the open position of the movable cover 9. In FIG. 1, the movable cover 9 is located at a closed position that closes the opening 8.
The reflection mirror member 5 includes a shaft 10 supported between both side plates of the housing 2, a mounting member 11 that is rotatably supported via the shaft 10, and a reflection fixed to the inner surface of the mounting member 11. And a mirror 12.
A surface that forms a part of the upper surface of the housing 2 and covers the outside of the reflection mirror member 5 serves as a mirror cover 2-2 that rotates together with the reflection mirror member 5.
With the movable cover 9 covering the opening 8, the tip of the mirror cover 2-2 is in contact with or close to the end surface of the movable cover 9, whereby the entire upper surface of the housing 2 is substantially sealed. Yes. FIG. 1 shows a non-use state of the projector 1 in which the reflection mirror member 5 is housed in the housing 2.

When the projector 1 is used, as shown in FIG. 2, the movable cover 9 is moved (slid) to the left side in the drawing to set the open position. The reflecting mirror member 5 is rotated upward in conjunction with the operation of opening the movable cover 9 and protrudes outward from the housing 2, and is set to a prescribed optical position (use position). The interlocking mechanism will be described later.
When the movable cover 9 is moved, a light passing space from the lens group 4 to the reflection mirror 12 is formed. The amount of movement (sliding amount) of the movable cover 9 is such that the opening that can project the image projection light reflected in the housing 2 (also simply referred to as “image light”) to the outside of the housing 2 is the distance from the reflection mirror member 5. The amount of movement that can be formed between them.
The image light that has passed through the lens group 4 is reflected by the reflecting mirror 12, which is an aspheric reflecting mirror, and then by the reflecting mirror 6, and is projected to the outside of the device through the paths abc, a′-b′-c ′. To the screen 15.
As apparent from FIG. 2, when the projector 1 is used, the reflection mirror member 5 protrudes outward from the housing 2, so that the outer shape is bulky.

Based on FIG.3 and FIG.4, the interlocking mechanism (it abbreviate | omits in FIG.1, 2) of the movable cover 9 and the reflective mirror member 5 is demonstrated in detail.
FIG. 3 is a schematic diagram when the projector 1 is not used. The interlocking mechanism 16 includes a mirror lever 18 rotatably supported via a pin 17 (point B) supported on one side surface of the housing 2, and an attachment member that rotates about a shaft 10 (point A). 11, a pin 19 (point E) that contacts and engages with the protruding edge 18a of the mirror lever 18, a mirror spring 20 that urges the mounting member 11 in a direction protruding outward of the housing 2, and a pin 17 In the same manner as described above, a cover lever 22 that is rotatably supported via a pin 21 supported on one side surface of the housing 2 and a front end portion 22 a of the cover lever 22 provided on the movable cover 9 are brought into contact with and engaged with each other. A pin 23 (point D), a cover lever spring 24 that urges the cover lever 22 in the closing direction of the movable cover 9, a pin 25 (point G) provided on the mirror lever 18, and a pin provided on the cover lever 22 26 (point F) and mirror lever 1 And a relay lever 27 and the like for connecting the cover lever 22 between.
A switch SW for turning on and off the power of the projector 1 is provided in the housing 2, and the convex portion 22 b (point H) formed on the cover lever 22 presses the switch terminal SW-1 in the switch SW. (ON).

In this non-use state, the movable cover 9 and the mirror cover 2-2 that open and close the opening of the housing 2 including the opening 8 are closed. In this state, the reflection mirror 12 (not shown) is a mirror. It is in a state of being housed in the main body together with the mounting member 11 restricted at the point E by the restriction of the lever 18.
Due to the substantially sealed state of the housing 2, the reflection mirrors 6 and 12, the lens group 4 and other mechanism portions are shielded from external dust and the like.

Next, the operation when the projector 1 is used will be described with reference to FIG.
When the user slides the movable cover 9 to the open position, the reflection mirror member 5 protrudes outward from the housing 2 via the interlocking mechanism 16 and is set to the use position. That is, an opening that can automatically project the image light to the outside of the housing 2 is formed by the sliding operation of the movable cover 9.
The operation (sliding) of the movable cover 9 in the left direction is performed by rotating the cover lever 22 that is engaged at the point D and biased in the clockwise direction counterclockwise around the C point. The mirror lever 18 rotatably mounted at the point G is rotated counterclockwise around the point B through the relay lever 27 rotatably mounted at the point F.
The mounting member 11 engaged at the point E with the mirror lever 18 rotating in the counterclockwise direction is pivotally supported at the point A and urged in the clockwise direction by the mirror spring 20, and the mirror lever 18 rotates in the counterclockwise direction. It rotates in the clockwise direction, and the reflection mirror 12 (reflection mirror member 5) protrudes.
Although not shown, the open side stop position (regulation at the use position) of the reflection mirror 12 is determined by the positional relationship between the attachment member 11 and the main body (housing).

When the movable cover 9 is set to the open position, the projection 22b presses the switch terminal SW-1, and the power source of the projector 1 is turned on.
By operating an operation panel (not shown) in such a state, the projector 1 can be used.
When the use is finished and the movable cover 9 is returned to the closed position, the reflection mirror member 5 is automatically moved in the storing direction by the reverse operation of the interlocking mechanism 16 and becomes in the non-use state shown in FIG. Is automatically turned off.

In the present embodiment, the reflecting mirror member 5 protrudes outward only when in use and is completely stored in the housing in a folded state when not in use, so that the reflecting mirror shown in FIG. 5 is in use. Compared with the prior art such as Patent Document 1 that is housed in the housing as it is, it is possible to eliminate a useless space due to the reflection mirror protruding in the housing.
Thereby, the height (T in FIG. 5) of the housing | casing 2 can be made still smaller, and the compactness at the time of non-use, the ease of carrying around, the handleability, etc. can be aimed at. Installation instability due to the optical axis being positioned above the casing as in Patent Document 1 can also be eliminated.
Moreover, since all the outer surfaces of the housing | casing 2 can be made into a flat surface (cuboid shape), maintaining size reduction and weight reduction, portability, the storing property to a bag etc. can be improved further.
Further, when not in use, the casing 2 can be substantially sealed while the reflecting mirror member 5 is completely accommodated in the casing 2, so that an optical system such as a reflecting mirror can be used as compared with the external installation method disclosed in Patent Document 2 and the like. The protective property can be further improved.
Since the reflection mirror member 5 is automatically opened / closed only by operating the movable cover 9 and the power is turned on / off, the mirror mechanism portion, which is a large member provided outside, as in Patent Document 2 and the like, is operated. The operability can be improved as compared with the above.

In the above embodiment, the reflection mirror member 5 is automatically opened and closed by manually operating the movable cover 9, and the power supply of the projector 1 is automatically turned ON / OFF. However, the present invention is not limited to this. is not.
For example, when the user makes an intention to use the projector 1 (pressing a key on the operation panel), the movable cover 9 is automatically opened and closed by a driving source (such as a small motor) (not shown). You may make it set to. The key in this case may be a power ON / OFF key.
In the above-described power ON / OFF method based on the movement of the movable cover 9, the structure is mechanically performed using the rotation of the cover lever 22. However, the displacement of the movable cover 9 to the open position is optically detected. May be turned ON / OFF.

Although the movable cover 9 is configured to slide along the outer surface of the housing 2, the movable cover 9 may be configured to rotate in the vertical direction (automatic or manual).
The movable cover 9 may be moved in the circumferential direction of the housing 2 with flexibility. In this case, the reflection mirror member 5 may be manually opened and closed.
In the above embodiment, the mirror cover 2-2 that forms a part of the outer surface of the housing 2 is rotated together with the reflection mirror member 5, but the reflection mirror member 5 may also serve as the mirror cover 2-2. . In this case, the attachment member 11 and the reflection mirror 12 may be integrated with each other without forming separate members, and a mirror surface may be formed on the inner surface of the integrated structure.
The movable cover 9 and the reflection mirror member 5 may be individually opened and closed without providing the interlocking mechanism 16 described above. In this way, even when an external force is unexpectedly applied in the direction in which the projector 1 is housed with respect to the reflecting mirror member 5 while the projector 1 is in use, it is possible to avoid the problem of automatically turning off the power and ending the image projection. Can do.
In the above embodiment, the projector 1 is used by placing it on a flat surface such as a desktop. However, the projector 1 may be temporarily fixed to a vertical wall surface or ceiling surface by a magnetic force or the like.

2 Housing 3 Optical system 4 Lens group 5 Reflecting mirror member 9 Movable cover 12 Reflecting mirror SW Power switch

JP 2006-235516 A JP 2006-259252 A JP 2008-134350 A

Claims (8)

In a video projection apparatus in which a light source, a video display element that modulates light from the light source to generate video light, and an optical system that magnifies and projects a video from the video display element are housed in a box-shaped casing ,
The optical system includes a lens group and a reflecting mirror member whose reflecting surface for modulating the projection direction of an image is an aspheric surface, and the reflecting mirror member is configured to be movable. An image projection apparatus which is set at a use position protruding outside the body and can be stored in the housing when the apparatus is not used. The image projection apparatus according to claim 1,
The housing has a movable cover that can open and close a part of the housing and forms a light passing space from the lens group to the reflection mirror member by moving to a position where the movable cover is open. An image projection apparatus which is in a usable state by moving to an open position and moving the reflection mirror member to the use position. The image projection apparatus according to claim 2,
The moving amount of the movable cover is a moving amount capable of forming an opening that can project the image projection light reflected in the housing to the outside of the housing when the device is used. In the video projection device according to claim 2 or 3,
When the apparatus in which the reflection mirror member is housed in the housing and the movable cover is in the closed position is not used, the side surface of the housing having the movable cover is substantially sealed and becomes a substantially flat surface. A video projection device characterized by the above. In the video projection device according to any one of claims 2 to 4,
The movable cover and the reflection mirror member are connected so as to be interlocked, and the reflection mirror member protrudes out of the housing with the movement of the movable cover to the open position, and with the movement of the movable cover to the closed position. And a video projection device housed in the housing. In the video projection device according to any one of claims 2 to 5,
The movement of the movable cover is linked with the power switch of the apparatus main body, the power switch is turned on at the open position of the movable cover, and is turned off by the retreating movement from the open position of the movable cover. Video projection device. The video projection device according to claim 5,
Drive means for driving the movable cover is provided. When the power switch of the apparatus main body is turned on, the movable cover moves to the open position and the reflection mirror member protrudes out of the housing, and when turned off, the movable cover moves to the closed position. And the reflection mirror member is housed in the housing. In the video projection device according to any one of claims 2 to 4,
In an operating state where the reflection mirror member protrudes out of the housing, when an external force in the storage direction is applied to the reflection mirror member, only the reflection mirror member retreats into the housing, and the movable cover moves. A video projection device characterized by not accompanying.

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