JP2014112781A - Image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection device which, when enlarging and projecting a book teaching material, is capable of simply enlarging and projecting only a predetermined specific questions among the questions of the book teaching material.SOLUTION: An image projection device 1 comprises: a mask 10 which covers a target page 5A of the book teaching material 5 and has at least one windows W1 to W6 for exposure of arbitrary projection target contents B1 to B6 within the target page 5; a document camera 2 for imaging the projection target contents B1 to B6 exposed in the windows in the mask 10; and a projector 3 which enlarges a projection target content imaged by the document camera 2 to enlarge and project on a screen T as an enlarged projection content F1.

Description

  The present invention relates to an image projection apparatus for projecting a specific problem such as a book teaching material on a screen or the like.

  When explaining how to solve problems in elementary school learning, it is effective to project and expand the contents of book materials that contain problems using ICT (Information and Communication Technology) equipment. is there. This ICT device is a means for effectively achieving learning objectives aiming at an “understanding” class, and its utilization is focused.

  An apparatus for enlarging and projecting the contents of such a book teaching material is disclosed in Patent Document 1. In the technique of Patent Document 1, a document that is a subject and the attribute information of the subject are photographed on the same screen by an imaging device and captured in a computer (see Patent Document 1).

JP 2005-31912 A

  By the way, when multiple adjacent problems (or part of the problems) listed in the book materials are shown on the same screen, the child is confused without knowing which problem is selected and tackled. End up. In primary education, when teachers teach children, it is important how to concentrate them and tackle problems. For this reason, if an unnecessary part other than the selected problem appears in the same screen, the concentration of the child is significantly reduced.

  In addition, if it takes time to adjust the ICT device to enlarge and project the problem of the book teaching material, the concentration of the child is reduced, so it is necessary to instantly enlarge the problem of the book teaching material.

  However, in teaching instruction in elementary school, teachers decide the problem to be enlarged (problems to be taught / explained) according to the reaction (understanding level) of the students in the class. Etc.) and device settings are difficult to prepare in advance.

  The present invention has been made in view of the above, and an object of the present invention is to simplify only a predetermined specific projection target content among the projection target contents of the book teaching material when enlarging and projecting the book teaching material. An object of the present invention is to provide an image projection apparatus capable of enlarging and projecting.

  In order to achieve the above object, an image projection apparatus according to claim 1, a mask having at least one window for covering a target page of a book teaching material and exposing an arbitrary projection target content in the target page. A document camera that captures the projection target content exposed in the window of the mask, and the projection target content captured by the document camera is enlarged and projected as an enlarged projection content on the projection target. The main point is to have a projector.

  In the image projection apparatus according to the first aspect, the document camera can enlarge only the projection target content appearing in the window portion of the mask and display it on the projection target. For this reason, when enlarging and projecting a book teaching material, it is possible to easily enlarge and project only a predetermined specific projection target content (for example, a problem) in the projection target content of the book teaching material.

  The image projection apparatus according to claim 2, wherein the mask includes a plurality of the window portions, and the window portion moves any of the projection target contents by moving the mask along the target page. The gist is that the mask is disposed so as to be exposed. For this reason, if the mask moves along the target page, when the book teaching material is enlarged and projected, only the problem that is the specific projection target content that appears in the predetermined mask window of the book teaching material problem Can be easily enlarged and projected.

  The gist of the image projection apparatus according to claim 3 is that the window is formed in a rectangular shape to expose the contents of the projection target. For this reason, since the window part should just be formed in a simple rectangular shape, a mask can be made at low cost.

  The gist of the present invention is that the mask is made of a paper material, and the window portion of the mask is formed by cutting the paper material. For this reason, the mask window can be made at low cost by cutting paper.

  6. The image projection apparatus according to claim 5, wherein the mask is made of a plastic material, the window portion of the mask is formed in the plastic material, and the mask is subjected to an antireflection treatment. And For this reason, the window portion of the mask can be made at low cost by cutting a plastic material, and reflection from the mask can be prevented when the document camera takes an image.

  ADVANTAGE OF THE INVENTION According to this invention, when enlarging and projecting a book teaching material, the image projection apparatus which can carry out simply an enlarging projection of only the predetermined specific projection object content of the projection object content of a book teaching material can be provided.

It is a figure which shows 1st Embodiment of the image projector of this invention. It is a figure which shows a mode that the expansion projection content described in the book teaching materials is enlarged and projected on a screen as expansion projection content. It is a figure which shows a mode that another enlarged projection content described in the book teaching material is enlarged and projected as a magnified projection content on a screen. It is a figure which shows the example of a shape of the mask shown in FIG. 2 and FIG. It is a figure which shows the example of the target page of a library teaching material. It is a figure which shows the operation | movement which a teacher expands only the expansion projection content of the object page of the target material of a library teaching material using a mask, and projects on a screen. It is a figure which shows the operation | movement which a teacher expands only the expansion projection content of the object page of the target material of a library teaching material using a mask, and projects on a screen. It is a figure which shows the operation | movement which a teacher expands only the expansion projection content of the object page of the target material of a library teaching material using a mask, and projects on a screen. It is a figure which shows the operation | movement which a teacher expands only the expansion projection content of the object page of the target material of a library teaching material using a mask, and projects on a screen. It is a figure which shows the operation | movement which a teacher expands only the expansion projection content of the object page of the target material of a library teaching material using a mask, and projects on a screen. It is a figure which shows the example of another mask in 2nd Embodiment of the image projector of this invention. It is a figure which shows the object page of the arithmetic book material. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the object page of the book teaching material of another arithmetic. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the object page of the book teaching material of another arithmetic. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the object page of the book teaching material of another arithmetic. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the object page of the book teaching materials for reading a clock. It is a figure which shows the state which mounted the mask on the object page shown in FIG. It is a figure which shows the example of the mask for Japanese languages in other embodiment which concerns on this invention. It is a figure which shows the example of the mask for arithmetic in other embodiment which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a first embodiment of an image projection apparatus of the present invention.

  An image projection apparatus 1 shown in FIG. 1 is an ICT device for effectively achieving a learning target for an “understanding” class. The image projector 1 is also called a real projector, and has a document camera 2, an image projector 3, and a mask 10.

  The document camera 2 is an imaging device for capturing, as color images, a book teaching material 5 placed on a stage 4, for example, a desk 4, and a mask 10 placed on the book teaching material 5. The mask 10 is also referred to as a mask sheet. The document camera 2 has, for example, a CCD (charge coupled device) imaging unit 6, a support 7 that supports the CCD imaging unit 6, and a base 8.

  The base 8 is placed on the desk 4, and the lower part of the support 7 is fixed to the base 8. A CCD imaging unit 6 is fixed on the support 7. For example, the support 7 can freely rotate the direction of the CCD image pickup unit 6 in the R1 direction around the central axis G1 and freely rotate in the R2 direction around the central axis G2.

  A power switch button 9 and the like are arranged on the base 8 shown in FIG. The support body 7 has a zoom adjustment operation unit 7A, and the teacher performs zoom adjustment of the CCD image pickup unit 6 by rotating the zoom adjustment operation unit 7A in the R3 direction about the central axis G3. be able to. Further, the focus adjustment can be performed by pressing the focus button 7F. The base 8 is connected to a commercial AC power source AC using a power cable C.

  The base 8 is connected to the image projector 3 using an RGB cable CB. The image projector 3 is placed on, for example, another desk 4F. The image projector 3 can display, as an example, the enlarged projection content F1 on the screen T as a projection target, based on the video signal S sent from the document camera 2. . The enlarged projection content F1 can be displayed on the screen T with an aspect ratio of 16: 9 or 4: 3, but is not particularly limited.

  FIG. 2 shows a state in which the projection target content B1 (problem) described on the target page of the Japanese language learning material 5 is enlarged and projected on the screen T as the enlarged projection content F1. Similarly, FIG. 3 shows a state in which the projection target content B2 (problem) described on the target page of the book teaching material 5 is enlarged and projected on the screen T as the enlarged projection content F2. .

  The mask 10 shown in FIG. 2 has a window portion W1. The projection target content B1 in FIG. 2 is exposed in the window portion W1 of the mask 10. Similarly, the mask 10 shown in FIG. 3 has a window portion W2. The projection target content B2 in FIG. 3 is exposed in the window W2 of the mask 10.

  As shown in FIGS. 2 and 3, the imaging range SS that can be captured and captured by the document camera 2 is adjusted by the teacher by operating the zoom adjustment operation unit 7A shown in FIG. By performing the above, it is set to be larger than the window portions W1 and W2 by matching with the window portions W1 and W2 of the mask 10, respectively. The document camera 2 can reliably capture and capture the projection target content B1 in the window W1 and the projection target content B2 in the window W2.

  As a result, as shown in FIG. 2, the projection target content B <b> 1 described on the target page of the book teaching material 5 is captured as a color image by the document camera 2, and the video signal S is sent from the document camera 2 to the image projector 3. Send. Based on the video signal S, the image projector 3 can enlarge and project the horizontal and vertical sizes on the screen T as the enlarged projection content F1.

  As shown in FIG. 3, the projection target content B <b> 2 described on the target page of the book teaching material 5 is captured as a color image by the document camera 2, and a video signal S is sent from the document camera 2 to the image projector 3. send. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T as the enlarged projection content F2.

  FIG. 4 shows an example of the shape of the mask 10 shown in FIGS. This mask 10 is a thin plate-like member, and as shown in FIG. 1, it is necessary to prevent unnecessary portions other than the selected problem from appearing on the same screen on the target page 5A of the book teaching material 5. It has a role to cover areas other than the part. As shown in FIG. 1, by using the mask 10 on the target page 5A of the book teaching material 5, the adjacent problem (or part thereof) described in the target page 5A of the book teaching material 5 can be displayed within the same screen. For example, it is possible to clearly identify which problem the child has selected and tackled. Therefore, for example, in primary education, it is possible to increase learning efficiency by concentrating children at the time of teaching and addressing problems.

  The mask 10 shown in FIG. 4 can use an opaque paperboard or a plastic board. When the paperboard mask 10 is used, it is easy for a teacher to handle the paperboard mask 10, and it is easy to understand which part of the target page 5 </ b> A of the book teaching material 5 should be hidden intuitively using the mask 10. When the window portions W1 to W6 are formed in the paper mask 10, the window portion is formed by forming an opening in the mask 10. Further, for example, it is possible to publish an advertisement or the like on the back surface by changing to four colors.

  When the plastic plate mask 10 is used, the material can be manufactured at low cost by using, for example, a PP (polypropylene) sheet, but is not particularly limited. When the mask 10 for the PP sheet is made, the transparent part of the PP sheet can be formed in the windows W1 to W6 by printing the blank part in white on the transparent film to make it opaque. The plastic plate mask 10 is subjected to antireflection treatment on the surface thereof, and when the projection target contents B1 and B2 described in the book teaching material 5 are captured as color images by the document camera 2, irregular reflection from the mask 10 occurs. Can be captured and clear images can be captured.

  The mask 10 illustrated in FIG. 4 is a rectangular member, for example, and has rectangular windows W1 to W6. The window portion W1 is already shown in FIG. 2, and the window portion W2 is already shown in FIG. Each of the windows W1 to W6 has a predetermined horizontal and vertical size, and is arranged in the order of windows W1, W3, W4, W2, W5, and W6 from the right side 10R to the left side 10L of the mask 10. ing. When imaging a certain window, the periphery of each window W1, W3, W4, W2, W5, W6 can be secured, for example, by ensuring a margin with an aspect ratio of 16: 9 or 4: 3. Adjacent windows can be prevented from entering.

  Since the aspect ratio is 4: 3 or 16: 9 depending on the document camera, the required window size is different. In this embodiment, both aspect ratios are used. However, the margin may be narrowed so that only one of the margins can be accommodated.

  FIG. 5 shows an actual example of the target page 5A of the book teaching material 5, and the target page 5A of the book teaching material 5 is used for learning kanji. The target page 5A of the book teaching material 5 includes, for example, projection target contents B1, B2, B3, B4, and B5. Specifically, for example, the projection target content B1 indicates a Chinese character “Festival”, and the projection target content B2 indicates an idiom that uses “Festival”. The projection target content B3 indicates how to write “festival”, and the projection target content B4 indicates how to use “festival”. The projection target content B5 indicates the formation of “Festival”, and the projection target content B6 indicates the number of strokes of “Festival”.

  Next, referring to FIGS. 6 to 10, the teacher uses the mask 10 to enlarge only the projection target contents B1, B2, B3, B4, and B5 of the target page 5A of the book teaching material 5 to the screen T. An operation example for projection will be described. 6 to 10, the mask 10 is placed on the target page 5A of the book teaching material 5 with the upper end of the mask 10 aligned with the upper end of the target page 5A. When the teacher changes the projection target content, the mask 10 is used while being shifted in the arrow Y direction on the target page 5A of the book teaching material 5.

  First, referring to FIG. 6, the projection target content B1 of the target page 5A shown in FIG. 5 corresponds to the window W1 of the mask 10 and is exposed to the window W1. An imaging range SS of the document camera 2 shown in FIG. 2 indicates a range that can be projected, and has an aspect ratio of 4: 3, for example. The imaging range SS of the document camera 2 is imaged so as to include the window portion W1 by adjusting the zoom of the CCD imaging unit 6. As a result, as shown in FIG. 2, the projection target content B <b> 1 described in the book teaching material 5 is captured as a color image by the document camera 2, and a video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can project the screen T with an enlarged vertical and horizontal size as the enlarged projection content F1.

  Next, the target page 5A is shifted parallel to the Y direction, and the mask 10 of FIG. 6 is shifted parallel to the Y direction on the target page 5A, thereby positioning the mask 10 at the position shown in FIG. The projection target content B3 of the target page 5A shown in FIG. 5 corresponds to the window W3 of the mask 10 and is exposed to the window W3. The imaging range SS of the document camera 2 is imaged so as to include the window portion W3 by adjusting the zoom of the CCD imaging unit 6. Thereby, the projection target content B3 described in the book teaching material 5 is captured as a color image by the document camera 2, and the video signal S is transmitted from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  Next, by shifting the target page 5A parallel to the Y direction and further shifting the mask 10 of FIG. 7 on the target page 5A further parallel to the Y direction, the mask 10 is positioned at the position shown in FIG. The projection target content B4 of the target page 5A shown in FIG. 5 corresponds to the window W4 of the mask 10 and is exposed to the window W4. The imaging range SS of the document camera 2 is imaged so as to include the window W4 by adjusting the zoom of the CCD imaging unit 6. As a result, the projection target content B 4 described in the book teaching material 5 is captured as a color image by the document camera 2, and the video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  Next, by shifting the target page 5A parallel to the Y direction and further shifting the mask 10 of FIG. 8 on the target page 5A further parallel to the Y direction, the mask 10 is positioned at the position shown in FIG. The projection target content B2 of the target page 5A shown in FIG. 5 corresponds to the window W2 of the mask 10 and is exposed to the window W2. The imaging range SS of the document camera 2 is imaged so as to include the window portion W2 by adjusting the zoom of the CCD imaging unit 6. Thereby, the projection target content B2 described in the book teaching material 5 is captured as a color image by the document camera 2, and a video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can project the screen T with the vertical and horizontal sizes enlarged as the enlarged projection content F2, as shown in FIG.

  In this case, the projection target content B2 described in the book teaching material 5 shown in FIG. 3 is smaller in size than the projection target content B1 described in the book teaching material 5 shown in FIG. The enlarged projection content F2 projected on the screen T and the enlarged projection content F1 projected on the screen T shown in FIG. This is the same for the case where the projection target contents B1 to B5 shown in FIGS. 6 to 10 are enlarged and projected.

  Next, by shifting the target page 5A parallel to the Y direction and further shifting the mask 10 of FIG. 9 further parallel to the Y direction on the target page 5A, the mask 10 is positioned at the position shown in FIG. The projection target content B5 of the target page 5A shown in FIG. 5 corresponds to the window W5 of the mask 10 and is exposed to the window W5. The imaging range SS of the document camera 2 is imaged so as to include the window W5 by adjusting the zoom of the CCD imaging unit 6. As a result, the projection target content B5 described in the book teaching material 5 is captured as a color image by the document camera 2, and a video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  Similarly, by shifting the target page 5A parallel to the Y direction and further shifting the mask 10 of FIG. 9 further parallel to the Y direction on the target page 5A, the projection target content B6 of the target page 5A shown in FIG. , Corresponding to the window portion W6 of the mask 10, and exposed to the window portion W6. The imaging range SS of the document camera 2 is imaged so as to include the window W6 by adjusting the zoom of the CCD imaging unit 6. As a result, the projection target content B 6 described in the book teaching material 5 is captured as a color image by the document camera 2, and a video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  In this way, the teacher shifts the target page 5A in parallel to the Y direction, and also shifts the mask 10 on the target page 5A in parallel to the Y direction, so that the projection target contents B1, B3, B4 shown in FIG. It can position to window part W1, W3, W4, W2, W5, and W6 in order of B2, B5, and B6, respectively. For this reason, the unnecessary part other than the required specific projection target content can be covered using the mask 10. The size of the imaging range SS of the document camera 2 can be adjusted to an area including the windows W1, W3, W4, W2, W5, and W6 by zoom adjustment of the CCD imaging unit 6 in FIG. Even if the sizes of B1 to B6 are various, they can be projected on the screen T shown in FIG.

  This prevents adjacent problems (or parts of them) listed in the book materials from appearing on the same screen, so that students can clearly see which problem they are selecting and working on. Can be. Therefore, for example, in primary education, it is possible to increase learning efficiency by concentrating children at the time of teaching and addressing problems.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment of the present invention, the image projection apparatus 1 of the first embodiment of the present invention shown in FIGS. 1 to 3 is used. As shown in FIG. 10, the shape of the mask 100 is the mask shown in FIG. Different from 10 shapes. This mask 10 is used for, for example, a mathematical learning material 105 different from the national language learning material 5 shown in FIG. The mask 100 is a rectangular member made of the same material as the mask 10, and has rectangular windows H1 to H6.

  FIG. 12 shows the target page 105A of the arithmetic book material 105. On the target page 105A of the book teaching material 105, a mathematical sentence problem is listed as the content to be projected.

  When the mask 100 of FIG. 11 is placed on the target page 105A of FIG. 12, for example, the mask 100 is as shown in FIG. In FIG. 13, for example, the projection target content BR6 that is an arithmetic sentence problem of the target page 105 </ b> A is exposed in the window H <b> 6 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H6 by zoom adjustment of the CCD imaging unit 6 of FIG. As a result, the projection target content BR6 described in the book teaching material 105 is captured as a color image by the document camera 2, and the video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  FIG. 14 shows a target page 205A of a book material 205 of another arithmetic. The target page 205A has a multiplication problem of arithmetic. When the mask 100 in FIG. 11 is placed on the target page 205A, for example, it becomes as shown in FIG. In FIG. 15, for example, the projection target content CR <b> 1, which is a multiplication problem of the target page 205 </ b> A, is exposed in the window H <b> 1 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H1 by zoom adjustment of the CCD imaging unit 6 of FIG. Thereby, the projection target content CR1 described in the book teaching material 205 is captured as a color image by the document camera 2, and the video signal S is sent from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  FIG. 16 shows a target page 305A of a book material 305 of another arithmetic. The target page 305A shows an example of multiplication of fractions together with figures. When the mask 100 in FIG. 11 is placed on the target page 305A, for example, the mask is as shown in FIG. In FIG. 17, for example, the projection target content DR <b> 1, which is an example of multiplication of the fraction of the target page 305 </ b> A, is exposed in the window H <b> 5 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H5 by zoom adjustment of the CCD imaging unit 6 of FIG. Accordingly, the projection target content DR1 described in the book teaching material 305 is captured as a color image by the document camera 2, and the video signal S is transmitted from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  FIG. 18 shows the target page 305A of the arithmetic book material 305, and the mask 100 of FIG. 11 is placed on the target page 305A. In FIG. 18, for example, the projection target content DR <b> 2, which is a fraction multiplication problem of the target page 305 </ b> A, is exposed in the window H <b> 4 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H4 by zoom adjustment of the CCD imaging unit 6 of FIG. Thereby, the projection target content DR2 described in the book teaching material 305 is captured as a color image by the document camera 2, and the video signal S is transmitted from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  FIG. 19 shows a target page 405A of a book material 405 of another arithmetic. The target page 405A has an addition problem and a subtraction problem. When the mask 100 of FIG. 11 is placed on the target page 405A, for example, as shown in FIG. In FIG. 20, for example, the subtraction problem projection target content ER1 of the target page 405A is exposed in the window H2 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H2 by zoom adjustment of the CCD imaging unit 6 of FIG. Thereby, the projection target content ER1 described in the book teaching material 405 is captured as a color image by the document camera 2, and the video signal S is transmitted from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  FIG. 21 shows a target page 505A of a book teaching material 505 for reading a clock. When the mask 100 of FIG. 11 is placed on the target page 505A, for example, it becomes as shown in FIG. In FIG. 22, for example, the projection target content FR1 of the target page 505A is exposed to the window H3 of the mask 100. The imaging range SS of the document camera 2 is imaged so as to include the window H3 by zoom adjustment of the CCD imaging unit 6 of FIG. Accordingly, the projection target content FR1 described in the book teaching material 505 is captured as a color image by the document camera 2 and sends a video signal S from the document camera 2 to the image projector 3. Based on the video signal S, the image projector 3 can enlarge and project the vertical and horizontal sizes on the screen T of FIG.

  As described above, the mask 100 according to the second embodiment of the present invention shown in FIG. 11 includes the target page 105A of the arithmetic teaching material 105, the target page 205A of the different arithmetic teaching material 205, and the other arithmetic book teaching material. It can be used in common for the target page 305A of 305, the target page 405A of the book teaching material 405 of another arithmetic, and the target page 505A of the book teaching material 505 for reading the clock. Thereby, even if the content of the book teaching material is different, the single mask 100 can be used in common, so that the teacher can use it more easily.

  As described above, the image projection apparatus 1 shown in FIG. 1 uses the mask 10 shown in FIG. 4 or the mask 100 shown in FIG. 11 as a necessary part (problem) in the contents of the target page of the book teaching material. Therefore, it is possible to surely prevent other unnecessary parts from appearing in the projected image. That is, only the specific problem that the teacher wants in the contents of the target page of the book teaching material can be projected on the screen. If some of the adjacent problems are reflected, the child may be confused.

  As already described, by providing a window on the mask 10 or 100 according to the basic layout of a book teaching material such as a repetitive calculation drill, for example, only one necessary question can be enlarged and projected. When teachers give guidance on calculations, it is important to project only the necessary parts compared to other teaching materials because the students will be confused if extra figures appear in the projected image on the screen. is there.

  In the mask 100 shown in FIG. 11, the window portions H1, H2 in the first row, the window portions H3, H4, H5 in the second row, and the window portion H6 in the third row are arranged, so the sentence problem shown in FIG. For the graphic problem shown in FIG. 16, it is possible to arrange a relatively large window at the lower part of the mask to cope with the basic layout of an irregular book teaching material. As shown in FIG. 11, the largest window is preferably formed below the mask in order to project irregular contents.

  In the mask 10 shown in FIG. 4 and the mask 100 shown in FIG. 11, the window portion is rectangular. However, when a plastic material such as polypropylene is used as the mask material, the strength of the mask can be ensured compared to the paper material. Therefore, the shape of the mask window part can be lowered by cutting off the notch at the bottom of the mask. You may make it become a reverse U-shape which opened in.

  The mask can easily hide surrounding problems in the target page of the book. Therefore, the teacher can enlarge and project only the problem (contents to be projected) immediately required on the spot from the target page of the book teaching material on the screen. It should be noted that the peripheral portion of the window portion of the mask is adjacent to a problem in a certain window portion when the margin within the window portion is enlarged by ensuring a margin with an aspect ratio of 16: 9 (or 4: 3). The problem in the window can be hidden.

  By simply moving the book teaching material to the window on the mask, and adjusting the equipment such as the document camera, you can make settings to instantly enlarge and project by simply performing the zoom operation and the focus operation as necessary. it can. For example, in the case of a horizontally long problem (projection target content), it is possible to maximize the magnified projection content that is magnified and projected on the screen simply by zooming all the way to the right and left. Further, in the case of a vertically long problem (projection target content), it is possible to maximize the magnified projection content that is magnified and projected on the screen simply by zooming all the way up and down. For this reason, there is no need to adjust the aspect ratio and position.

  By providing a window on the mask in accordance with the paper layout of the target page of the book teaching material, only the necessary problem (contents to be projected) can be instantly projected by simply covering the target page of the book teaching material. By optimizing the layout of the mask window for each library material, the teacher only needs to align the position of the window for the problem to be magnified.

  In an embodiment of the image projection apparatus of the present invention, a mask having at least one window for covering an object page of a book teaching material and exposing an arbitrary projection object content in the object page, and the window of the mask A document camera that captures the content of the projection object exposed to the screen, and a projector that magnifies and projects the projection target content captured by the document camera as an enlarged projection content on the projection object. Therefore, the document camera can enlarge only the projection target content appearing in the mask window and display it on the projection target. For this reason, when enlarging and projecting the book teaching material of the book teaching material, only a predetermined specific projection target content (for example, a problem) among the projection target contents (for example, a plurality of problems) of the book teaching material is easily enlarged and projected. be able to.

  The mask has a plurality of window portions, and the window portions are arranged on the mask so as to expose arbitrary contents to be projected by moving the mask along the target page. For this reason, if the mask moves along the target page, when the book teaching material is enlarged and projected, only a specific problem appearing in the window portion of the predetermined mask among the problems of the book teaching material can be easily enlarged. Can be projected.

  The window is formed in a rectangular shape so as to expose the content of the projection target. For this reason, since the window part should just be formed in a simple rectangular shape, a mask can be made at low cost.

  Since the mask is made of paper and the window portion of the mask is formed by cutting the paper material, the mask window can be made at low cost by cutting the paper material. .

  The mask is made of a plastic material, the window portion of the mask is formed of a plastic material, and the mask is subjected to antireflection treatment. For this reason, the window portion of the mask can be made at low cost by cutting a plastic material, and reflection from the mask can be prevented when the document camera takes an image.

  FIG. 23 is a view showing an example of a mask for Japanese language in another embodiment of the image projection apparatus according to the present invention. In the mask for Japanese language, the shape and arrangement of the window are considered so that the user can intuitively know which window should be selected. A guide for selecting a window portion is illustrated in a margin portion other than the window portion and its margin, with a part of the drill as a legend. For example, in the legend shown here, the window portion indicating the target Chinese character is indicated by (1) (indicated by 1 in the circle), and the window portion indicating the writing order of the Chinese character is indicated by (2) (in the drawing). What is indicated by 2) is shown in correspondence with each number.

  FIG. 24 is a diagram showing an example of an arithmetic mask in another embodiment of the image projection apparatus according to the present invention. This arithmetic mask is created with a mask similar to the national language mask shown in FIG. 23, that is, a patterned window portion, because the arithmetic drill is configured with various types of paper patterns. There are times when you can't. Therefore, in the mask for arithmetic shown in FIG. 24, the window portion is properly used in approximately several lines. Specifically, the “three-column arrangement problem” is a window portion used when the arrangement of the drill is three rows, and the right side and the left side are properly used depending on the size of the three rows. The same applies to the “two-column arrangement problem” and the “one-column arrangement problem”.

  The present invention has been described with reference to the embodiments. However, each embodiment is an example, and the scope of the invention described in the claims can be variously modified without departing from the scope of the invention. .

DESCRIPTION OF SYMBOLS 1 Image projector 2 Document camera 3 Image projector 5 Book teaching material 5A Target page 6 of book teaching material CCD camera 10 Mask 100 Mask B1 to B6 Content of projection object (problem as an example)
F1, F2 Enlarged projection contents W1 to W6 Window parts H1 to H6 Window part T Screen (example of projection object)

Claims (5)

A mask having at least one window for covering the target page of the library teaching material and exposing any projection target content in the target page;
A document camera that captures the projection target content exposed in the window of the mask;
A projector that projects the projection target content imaged by the document camera as an enlarged projection content on a projection target object;
An image projection apparatus comprising:   The mask has a plurality of the window portions, and the window portions are arranged on the mask so as to expose arbitrary projection target contents by moving the mask along the target page. The image projection apparatus according to claim 1.   The image projection apparatus according to claim 1, wherein the window portion is formed in a rectangular shape so as to expose the content of the projection target.   The image projection apparatus according to claim 1, wherein the mask is made of a paper material, and the window portion of the mask is formed by cutting the paper material.   4. The mask according to claim 1, wherein the mask is made of a plastic material, the window portion of the mask is formed in the plastic material, and the anti-reflection treatment is applied to the mask. The image projection apparatus described.