JP4347026B2 - Projector and method of fixing projection object - Google Patents

Description

  The present invention relates to a projector for projecting an image on a projection surface such as a screen, and a projection target fixing method for fixing a projection target projected on the projection surface.

  Conventionally, as a projector, an image input from an external device can be projected onto a projection surface, and can be used like an overhead projector (OHP) for projecting a document to be projected onto a projection surface. A projector is disclosed (for example, see Patent Document 1).

  This type of conventional projector includes a projection unit for projecting an image on a projection surface such as a screen, and an imaging unit for photographing a subject such as a document projected on the projection surface. And the mounting area | region in which a to-be-photographed object is mounted is provided in the top | upper surface part of the housing | casing in which the projection part was provided.

In the conventional projector configured as described above, the document placed on the placement area is photographed by the photographing unit, the image of the document is sent from the photographing unit to the projection unit, and the document is projected on the projection surface by the projection unit. Is projected.
Japanese Patent Laid-Open No. 2002-14316 (FIG. 2)

  By the way, since the conventional projector including the above-described photographing unit only has a document placed on the placement area, when photographing a subject, the air conditioner in the room, the air flow by the user's operation, etc. There is an inconvenience that the subject easily moves in the placement area and the projected image moves.

  Accordingly, an object of the present invention is to provide a projector and a method for fixing a projection target that can prevent a positional deviation from occurring in the projection target.

In order to achieve the above-described object, a projector according to the present invention includes a housing provided with a projection unit for projecting an image on a projection surface, an intake unit provided in the housing, and a housing. And an exhaust means provided. The top surface portion of the housing is provided with a placement area on which the projection target projected by the projection section is placed. In this placement area, the exhaust means creates a negative pressure in the housing to project the projection target. An adsorption opening for adsorbing is provided. The exhaust amount by the exhaust means is made larger than the intake amount by the intake means.

  According to the projector of the present invention configured as described above, the negative pressure is generated in the casing by the exhaust unit, and the projector is mounted on the mounting area by the suction force that sucks air into the casing from the suction opening. The projected object is attracted and fixed. Therefore, according to the projector of the present invention, since the projection target placed on the placement area is fixed, it is possible to prevent the projection target projected by the projection unit from moving and causing a positional shift.

  In addition, the projector according to the present invention may include an imaging unit that is provided outside the housing and captures the projection target. This prevents the projection target imaged by the imaging unit from moving and causing a positional shift.

  Moreover, it is preferable that the housing | casing with which the projector which concerns on this invention is provided is provided with the cover member for opening and closing the suction opening. This prevents dust from entering the housing from the suction opening when the projection target is not placed on the placement area.

  Moreover, it is preferable that the housing | casing with which the projector which concerns on this invention is provided is provided with the filter member for preventing dust from approaching into a housing | casing at the opening for adsorption | suction. This prevents dust from entering the housing from the suction opening when the projection target is not placed on the placement area.

  In addition, the projection target fixing method according to the present invention has a negative effect in the casing by exhausting the air in the casing in which the projection unit for projecting the image on the projection surface is provided outside. A pressure is generated, and a projection target projected by the projection unit is sucked and fixed by a suction opening provided on the top surface portion of the housing.

  Further, in the method for fixing a projection target according to the present invention, the projection target may be a subject photographed by a photographing unit provided outside the housing.

  Note that the projection target in the present invention refers to a document such as a sheet material or a film material.

  As described above, according to the present invention, the mounting area on which the projection target is mounted is provided with the housing provided with the suction opening for sucking the projection target, thereby being mounted on the mounting area. Since the projection target is fixed, it can be prevented that the projection target projected by the projection unit moves and the position shift occurs.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  The projector according to the present embodiment projects an image input from an external device onto a projection surface, and an object to be projected is placed on a placement area of a housing like an overhead projector (OHP). It is a projector that can project a subject on the projection surface as a projected image. The subject refers to a document such as a document in which characters and images are described on a sheet material, a film material, or the like.

  As shown in FIG. 1, the projector 1 includes a projection unit 5 for projecting an image on a projection surface such as a screen, a photographing unit 6 for photographing a document 3 to be projected, and the projection unit 5 and the photographing unit 6. A CPU (Central Processing Unit) (not shown) for controlling, the projection unit 5, and a casing 8 covering the CPU are provided.

  The projector 1 includes a cooling mechanism 10 for discharging heat generated by the projection unit 5 and the like to the outside of the housing 8. The cooling mechanism 10 includes an intake portion 21 for taking air from the outside into the housing 8 and an exhaust portion 22 that is an exhaust means for exhausting the air inside the housing 8 to the outside. Yes.

  The projection unit 5 includes a projection lens 11 for projecting an image on a projection surface, a liquid crystal display unit 12 that displays an image to be projected, a video control unit 13 that controls an image displayed on the liquid crystal display unit 12, and And a light source unit 14 having a lamp 15 for irradiating the liquid crystal display unit 12 with projection light.

  Note that the projection unit 5 may be configured to include a DMD (digital micromirror device) that reflects incident light from the light source unit 14 as an image instead of the liquid crystal display unit 12.

  The photographing unit 6 is provided at a position facing the top surface portion of the housing 8, and is for illumination for illuminating an image sensor such as a CCD (Charge-Coupled Device) and the document 3 photographed by the image sensor. And a lamp (not shown). A support column 17 that supports the imaging unit 6 is erected at the corner of the top surface of the housing 8, and the imaging unit 6 is provided at the tip of the support column 17. The photographing unit 6 is electrically connected to the projection unit 5 and the CPU, and sends the photographed image of the document 3 to the video control unit 13 of the projection unit 5. The image of the document 3 sent to the video control unit 13 is displayed on the liquid crystal display unit 12 as a video, so that the video of the document 3 is projected on the projection surface.

  The casing 8 is provided with a flat placement area on the top surface where the document 3 is placed. As shown in FIGS. 1 and 2, a plurality of suction holes 20, which are suction openings for sucking air from the outside into the housing 8, pass through the center of the placement area. ing. The document 3 placed on the placement area is sucked and fixed by the suction force that sucks air into the housing 8 from the suction holes 20. Of course, the opening shape, the number, and the arrangement of the suction holes may be changed as needed.

  The intake portion 21 has an intake port 24 provided on a side surface portion of the housing 8, an intake fan 25 provided in the vicinity of the intake port 24, and a motor (not shown) that rotationally drives the intake fan 25. is doing.

  The exhaust unit 22 includes an exhaust port 26 provided on the bottom surface of the housing 8, an exhaust fan 27 provided in the vicinity of the exhaust port 26, and a motor (not shown) that rotationally drives the exhaust fan 27. is doing. The exhaust unit 22 is configured such that the exhaust amount is set to be larger than the intake amount by the intake unit 21, and the inside of the housing 8 is favorably set to a negative pressure.

  Although not shown, for example, by operating the operation button or the like, for example, by temporarily stopping the intake section 21 and increasing the rotational speed of the exhaust fan 27 to forcibly increase the exhaust amount, the casing 8 The internal negative pressure may be increased so that the original 3 is adsorbed satisfactorily.

  Although not shown, a cover member for closing the suction hole 20 may be slidably or detachably provided on the top surface portion of the housing 8 when the document 3 is not projected. It is possible to prevent dust from entering the housing 8 from the suction hole 20 by a simple cover member. Further, if necessary, a dustproof filter for preventing dust from entering the housing 8 from the outside may be provided on the top surface of the housing 8 so as to close the suction hole 20. Good.

  With respect to the projector 1 configured as described above, an operation of sucking the document 3 placed on the placement area will be described.

  In the projector 1, the document 3 is placed on the placement area so as to cover the suction hole 20 of the housing 8, and air is sucked from the suction hole 20 by the negative pressure generated in the housing 8 by the exhaust unit 22. Then, the original 3 is attracted and fixed on the placement area by this suction force.

  When the document 3 is replaced with another document 3, the placed document 3 is easily removed against the suction force, and similarly, the other document 3 is attracted and fixed on the placement region. .

  As described above, according to the projector 1, the plurality of suction holes 20 for sucking the document 3 are provided in the top surface portion of the housing 8, so that the light source unit 14 in the housing 8 is cooled by the cooling mechanism 10. The heat generated from the above is discharged to the outside of the housing 8, and the document 3 placed in the placement area is fixed by the suction force by the suction hole 20. For this reason, according to the projector 1, when the document 3 is photographed by the photographing unit 6, the document 3 is moved in the placement area due to the air conditioning in the room or the air flow caused by the user's operation. Can be prevented. That is, the projector 1 can project the projection image of the document 3 satisfactorily without causing a positional shift in the projection image of the document 3 projected on the projection surface.

  In the projector 1 according to the above-described embodiment, the suction hole 20 is provided in the top surface portion of the housing 8. For example, when the suction hole is provided in the side surface portion of the housing and a document is projected. In addition, the document may be placed on the side surface portion by rotating the housing and positioning the side surface portion provided with the suction holes vertically upward.

  Further, the projector according to the present invention is not limited to the above-described projector, and may be applied to an overhead projector configured to project a projection light transmitted through a transparent document on a projection surface. Is preferred.

1 is a side view schematically showing an overall configuration of a projector according to the present invention. It is a top view which shows the said projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 3 Original document 5 Projection part 6 Image | photographing part 8 Case 10 Cooling mechanism 11 Projection lens 12 Liquid crystal display part 13 Image | video control part 14 Light source part 15 Lamp 17 Support | pillar 20 Adsorption hole 21 Intake part 22 Exhaust part 24 Intake port 25 Intake fan 26 Exhaust port 27 Exhaust fan

Claims (8)

A housing provided with a projection unit for projecting an image on the projection surface;
Air intake means provided in the housing;
An exhaust means provided in the housing,
The top surface portion of the housing is provided with a placement region on which the projection target projected by the projection unit is placed, and the exhaust means creates a negative pressure in the housing in the placement region. An adsorption opening for adsorbing the projection target is provided ,
The projector according to claim 1, wherein an exhaust amount by the exhaust unit is larger than an intake amount by the intake unit .   The projector according to claim 1, further comprising a photographing unit that is provided outside the housing and photographs the projection target. The suction opening, the projector according to claim 1 or 2 comprising a plurality of suction holes. The exhaust means, the projector according to any one of claims 1 is provided on the bottom surface facing the top surface portion of the housing 3. The projector according to any one of claims 1 to 4 , wherein the casing is provided with a cover member for opening and closing the suction opening. Wherein the suction opening, the projector according to any one of the to housing dust inside a filter member claims 1 provided in order to prevent the ingress 5. A projection unit for projecting an image on the projection surface sucks air into a casing provided inside, and exhausts the air in the casing to the outside of the casing, so that the exhaust amount is larger than the intake amount. A method of fixing a projection target, in which a negative pressure is generated in the casing, and a projection target projected by the projection unit is sucked and fixed by a suction opening provided on a top surface portion of the casing. The method of fixing a projection target according to claim 7 , wherein the projection target is a subject photographed by a photographing unit provided outside the casing.

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