JP2008250253A - Image projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image projection device designed so that a projection area where an image is projected can be moved as required, by freely moving the image projection device attached to a screen. <P>SOLUTION: The image projection device includes a light source and a projecting section that projects images by using light irradiated from the light source. This device is attached to the screen to which the images are projected. In the image projection device, a recess part is formed from the bottom of the image projection device to the position of its gravity center or to an area near the gravity center so as to engage with the upper edge of the screen. A power source circuit that supplies power to the light source and projecting section is provided. The power source circuit is disposed behind the screen instead of the recessed part. The projecting section is disposed in front of the surface side of the screen instead of the recessed part. The reflecting mirror of the projecting section that projects images onto the screen is disposed so as to freely move forward or backward relative to the screen. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image projection apparatus that enlarges and projects an image on a screen.

  2. Description of the Related Art Conventionally, there has been known an image projection apparatus such as a projector that displays image data input from a computer apparatus or the like on a liquid crystal display element and irradiates light on the liquid crystal display element to project an image on a screen. This image projection apparatus is usually installed on the upper surface of a table such as a desk provided in front of the screen and projects an image onto the screen.

As one form of such an image projection device, in an image projection device that projects an image on a screen having a sturdy frame such as a whiteboard or partition, the image projection device body is mounted on the upper edge of the screen, An image projection apparatus that projects an image from the upper front of the screen toward the screen has been proposed (see, for example, Patent Document 1).
JP 2006-276199 A

  However, when the image projection apparatus main body is mounted on the upper edge of the screen, there is a problem that the image projection apparatus cannot be moved.

  In particular, if the screen is a whiteboard, you may want to project an image while writing to the whiteboard as well as projecting an image on the whiteboard. In addition, when the image projection apparatus main body is mounted on the whiteboard, the writable area is limited, and the whiteboard cannot be effectively used.

  The present invention has been made to solve the above-described problems, and provides an image projection apparatus that allows an image projection apparatus mounted on a screen to be moved and a projection area on which an image is projected to be appropriately moved. It is.

  An image projection apparatus according to claim 1, comprising: a light source; and a projection unit that projects an image using light emitted from the light source, wherein the image projection apparatus is mounted on a screen that projects an image. A concave strip that engages with the upper edge of the screen is provided from below the projection device to the position of the center of gravity or the vicinity thereof.

  The image projection device according to claim 2 is the image projection device according to claim 1, wherein a power supply circuit for supplying power to the light source and the projection unit is provided, and the power supply circuit is arranged on the back side of the screen with respect to the groove portion. And the projection part was arrange | positioned rather than the groove part on the surface side of the screen.

  According to a third aspect of the present invention, in the image projection apparatus according to the second aspect, the reflection mirror of the projection unit that projects the image onto the screen is provided so as to be movable forward and backward.

  The image projecting device according to claim 4 is the image projecting device according to any one of claims 1 to 3, wherein the moving device moves the image projecting device along the upper edge of the screen to the concave portion. Was provided.

  According to a fifth aspect of the present invention, there is provided the image projection device according to any one of the first to fourth aspects, wherein the holding means for holding the screen is provided in the concave portion.

  The image projection apparatus according to claim 1, wherein the image projection apparatus includes a light source and a projection unit that projects an image using light emitted from the light source, and is mounted on a screen that projects the image. By providing a concave strip that engages with the upper edge of the screen from below the projection device to the position of the center of gravity or in the vicinity thereof, the image projection device can be installed in a balanced manner on the upper edge of the screen. Thus, the image projector can be moved safely.

  According to a second aspect of the present invention, in the image projection device according to the first aspect, a power source circuit for supplying power to the light source and the projection unit is provided, and the power source circuit is disposed on the back side of the screen from the concave portion. In addition, by arranging the projection unit on the surface side of the screen relative to the recess, the balance of the image projection device can be improved, and heat and noise emitted from the image projection device can be transferred to the back side of the screen. Since it can be released, it is possible to eliminate the possibility of feeling uncomfortable due to heat and noise emitted from the image projection apparatus.

  According to a third aspect of the present invention, in the image projection apparatus according to the second aspect, the reflection mirror of the projection unit that projects the image onto the screen is provided so as to be able to advance and retreat relative to the screen. Thus, the size of the image on the screen can be easily adjusted by advancing the reflecting mirror.

  The image projecting device according to claim 4, wherein in the image projecting device according to any one of claims 1 to 3, the moving means that moves the image projecting device along the upper edge of the screen to the concave portion. By providing this, the image projection apparatus can be moved safely and smoothly along the upper edge of the screen.

  The image projecting device according to claim 5, wherein in the image projecting device according to any one of claims 1 to 4, the upper edge of the screen is provided by providing a holding means for holding the screen in the recess. It is possible to improve the stability of the image projection apparatus installed in the projector.

  As shown in FIGS. 1 and 2, the image projection apparatus according to the present invention is used for image projection mounted on the upper edge of a screen S composed of a flat plate having sufficient strength such as a whiteboard W or a partition. Device A.

  As shown in FIG. 2, the image projection apparatus A has a light source 12 and a projection unit 13 that projects an image using light emitted from the light source 12 in a housing 11 having a predetermined shape. Furthermore, a power supply circuit 14 that supplies power to the light source 12 and the projection unit 13 and a control unit 15 that performs various controls are provided in the housing 11. The projection unit 13 is an LCD (Liquid Crystal Display) 13a that is irradiated with light that is emitted from the light source 12 and appropriately adjusted by the illumination optical system 16, and an image that magnifies and projects the light that has passed through the LCD 13a onto the screen S. It has an optical system 13b

  In particular, the casing 11 is provided with a concave strip 10 that is recessed upward at the bottom, extending in the left-right direction of the casing 11. That is, the concave strip 10 crosses the bottom of the casing 11 in the left-right direction, and the concave projection 10 is engaged with the upper edge of the screen S, so that the image projection apparatus A is connected to the upper edge of the screen S. It can be attached to.

  The concave strip 10 is provided over the position of the center of gravity of the image projection apparatus A or in the vicinity thereof. Therefore, when the image projection apparatus A is mounted on the upper edge of the screen S, the load of the image projection apparatus A can be applied along the vertical direction of the screen S, so that stress in a direction other than the vertical direction is applied to the screen S. It is possible to suppress the screen S from being damaged by suppressing the action of.

  In particular, in the image projection apparatus A, among the projection unit 13 and the power supply circuit 14 that are relatively heavy, the projection unit 13 is disposed on the surface side of the screen S with respect to the recess 10 and the power supply circuit 14 is disposed on the recess 10. Rather than the back side of the screen S. Therefore, the position of the center of gravity of the image projecting device can be easily positioned in the concave strip portion 10. Note that the ballast 17 may be appropriately disposed in the housing 11 as necessary.

  As described above, by appropriately arranging the projection unit 13 and the power supply circuit 14, it is possible to suppress the occurrence of weight deviation in the image projection apparatus A, and to position the center of gravity in the concave stripe part 10, thereby enabling the image projection apparatus. A can be installed in a balanced manner on the upper edge of the screen S, and can be safely moved along the upper edge of the screen S.

  In addition, since the power supply circuit 14 is arranged on the back side of the screen S, heat and noise emitted from the power supply circuit 14 when the image projection apparatus A is driven can be blocked by the screen S. Can eliminate the fear of feeling uncomfortable.

  In particular, the light source 12 having a large calorific value is also disposed on the back side of the screen S, and the cooling fan 18 provided for cooling the light source 12 is disposed at an upper position further rearward of the light source 12, thereby Even if the amount of operation becomes relatively large, it is possible to easily suppress the noise associated with the operation of the cooling fan 18 to a level that does not matter.

  The projection unit 13 of the image projection apparatus A is provided with a reflection mirror 13c that reflects the image projected by the imaging optical system 13b. The imaging optical system 13b temporarily projects the image in the forward direction of the screen S, Reflection projection is performed toward the screen S by the reflection mirror 13c arranged in the projection direction.

  The reflection mirror 13c is attached to the tip of a guide arm 13d that is attached to the housing 11 so as to be able to advance and retreat, and the size of the image projected on the screen S can be adjusted by adjusting the advancement amount of the guide arm 13d. It is said.

  That is, in the image projection apparatus A of the present invention, the power supply circuit 14 is arranged on the back surface side of the screen S with respect to the concave stripe portion 10, so that the projection arranged on the surface side of the screen S with respect to the concave stripe portion 10. While the amount of protrusion of the portion 13 from the surface of the screen S can be reduced to improve the compactness of the appearance, there is a possibility that the adjustment width of the image size may be reduced.

  That is, when the projection amount of the projection unit 13 from the surface of the screen S is small, it is possible to project a screen of a predetermined size onto the screen S by adjusting an image projected onto the screen S in advance. However, when the size of the projected image is changed, large trapezoidal distortion is likely to occur, so that the adjustment range of the image size has been reduced.

  Therefore, the image projected from the imaging optical system 13b is once projected in front of the screen S, reflected and projected toward the screen S by the reflecting mirror 13c, and the reflecting mirror 13c can be moved back and forth with respect to the casing 11. By adjusting the position to a desired image size by the guide arm 13d, it is possible to adjust the image size very easily without causing trapezoidal distortion, etc., and to increase the adjustment range. be able to.

  Note that the guide arm 13d may be moved forward and backward by remote operation using an appropriate drive motor or the like, and the inclination of the reflection mirror 13c may be arbitrarily adjusted according to the amount of advance of the guide arm 13d.

  The concave strip 10 provided in the housing 11 includes a bottom plate 10a that becomes the bottom of the concave strip 10, a front plate 10b that faces the front side of the screen S, and a rear plate that faces the back side of the screen S. In this embodiment, the bottom plate 10a is provided with a rolling roller 21 in contact with the upper edge of the screen S so as to be able to roll. The rotation axis of the rolling roller 21 is set to a direction orthogonal to the screen S.

  Accordingly, since the load of the image projection apparatus A acts on the whiteboard W constituting the screen S via the rolling roller 21, the load of the image projection apparatus can be applied along the vertical direction of the whiteboard W. The occurrence of damage can be suppressed.

  In addition, the image projection apparatus A can be smoothly moved along the upper edge of the screen S by rolling the rolling roller 21 along the width direction of the screen S. The rolling roller 21 preferably has the same length as the width of the upper end frame of the whiteboard W constituting the screen S. In addition, an appropriate driving roller is brought into contact with the rolling roller 21 or the output shaft of the driving motor is linked to the rotating shaft of the rolling roller 21 so that the driving roller can be driven. You can also run along the edge.

  Further, a load sensor or the like is attached to the rolling roller 21, and the load sensor detects that a predetermined load is applied to the rolling roller 21 by attaching the image projection apparatus A to the upper edge of the screen S. In this case, the main switch of the image projection apparatus A may be automatically turned on.

  The front plate 10b in the concave strip portion 10 is provided with a buffer 22 that is brought into contact with the surface of the screen S. The shock absorber 22 is made of an elastic material such as urethane, and prevents the screen S from being damaged by the front plate 10b coming into direct contact with the screen S with a predetermined distance between the front plate 10b and the screen S. is doing.

  It is desirable that the buffer 22 is brought into contact with the upper frame of the whiteboard W constituting the screen S, which has a relatively high strength. Instead of the buffer body 22, a rolling roller using a roller formed of an elastic body may be provided.

  The rear plate 10c in the concave strip portion 10 is provided with an abutting body 23 that abuts the back surface of the screen S so as to hold the screen S therebetween.

  As shown in an enlarged view in FIG. 3, the abutment body 23 is disposed in a housing portion 24 that is recessed in the rear side plate 10c. The abutment roller 23a has a rotating shaft directed in the vertical direction, and the abutment roller 23a. A stopper 23b that supports the contact roller 23a and a stopper stay 23d that supports the stopper 23b via a spring 23c are configured.

  The contact roller 23a is in contact with the upper frame of the whiteboard W constituting the screen S, which has a relatively high strength, like the buffer body 22. The contact roller 23a is preferably opposed to the buffer 22 with the screen S interposed therebetween. The contact roller 23a preferably has a roller portion made of an elastic body such as rubber.

  The stopper 23b is a bearing of the contact roller 23a, and further includes a bulging portion 25 that is opposed to the back surface of the screen S. The bulging portion 25 prevents the image projection device A from falling off when the image projection device A loses balance on the upper edge of the screen S and the bulging portion 25 comes into contact with the screen S. It is a body.

  The stopper stay 23d has a recess 23d-1 in which the stopper 23b is fitted on the front side, and a left frame 23d-2 and a right frame 23d-3 branched in a bifurcated shape on the rear side as shown in FIG. The left frame 23d-2 and the right frame 23d-3 are guided by the left side surface 11a and the right side surface 11b of the housing 11 so as to be able to advance and retreat in the front-rear direction of the housing 11.

  At the rear ends of the left frame 23d-2 and the right frame 23d-3, adjustment screws 26 pivotally attached to the rear side surface 11c of the casing 11 are respectively screwed. The stopper stays depending on the screw amount of the adjustment screws 26. The position of 23d can be adjusted.

  That is, after engaging the concave portion 10 of the image projection apparatus A with the upper edge of the screen S and placing it on the upper edge of the screen S, the adjusting screw 26 is rotated to advance the stopper stay 23d, and the contact roller By bringing 23a into contact with the upper end frame of the whiteboard W, the upper end frame of the whiteboard W is sandwiched between the contact roller 23a and the buffer 22 so that the image projection apparatus A can be firmly attached.

  The spring 23c urges the stopper 23b forward with respect to the stopper stay 23d, and after the contact roller 23a contacts the upper frame of the whiteboard W, the stopper stay 23d is moved until the spring 23c contracts to some extent. By moving forward, the upper end frame of the whiteboard W is clamped by the urging force of the spring 23c.

  When it is desired to move the image projection device A along the screen S, the stopper screw 23d is moved backward by rotating the adjustment screw 26, and the upper end frame of the whiteboard W is held between the contact roller 23a and the buffer body 22. By loosening the state, it can be easily moved in a desired direction. After the movement, the stopper stay 23d is advanced again, and the upper end frame of the whiteboard W is held between the contact roller 23a and the buffer body 22.

1 is a perspective view of an image projection apparatus according to an embodiment of the present invention. It is a longitudinal cross-sectional schematic diagram of the image projector which concerns on embodiment of this invention. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a principal part top view of FIG.

Explanation of symbols

W Whiteboard S Screen A Image projector
10 concave section
10a Bottom plate
10b Front plate
10c Rear side plate
11 Enclosure
12 Light source
13 Projector
13a LCD (Liquid Crystal Display)
13b Imaging optics
13c reflection mirror
19 Guide arm
14 Power supply circuit
15 Control unit
16 Illumination optics
17 Ballast
18 Cooling fan
21 Rolling roller
22 shock absorber
23 Abutment body
23a Contact roller
23b Stopper
23c spring
23d Stopper stay

Claims (5)

In an image projection apparatus comprising a light source and a projection unit that projects an image using light emitted from the light source, and mounted on a screen that projects the image,
An image projection apparatus comprising a concave portion that engages with the upper edge of the screen from the lower side of the image projection apparatus to the position of the center of gravity or the vicinity thereof. A power supply circuit for supplying power to the light source and the projection unit;
2. The image projection according to claim 1, wherein the power supply circuit is disposed on a rear surface side of the screen with respect to the concave stripe portion, and the projection portion is disposed on a front surface side of the screen with respect to the concave stripe portion. apparatus.   The image projection apparatus according to claim 2, wherein a reflection mirror of the projection unit that projects the image onto the screen is provided so as to be movable forward and backward with respect to the screen.   The image projection apparatus according to claim 1, wherein a moving unit that moves the image projection apparatus along the upper edge of the screen is provided in the concave portion. The image projecting device according to claim 1, wherein a clamping unit that clamps the screen is provided in the concave portion.

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