JP2007178475A - Image projection device and image projection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image projection device, arranged inexpensively in a simple configuration so that the projection surface of a screen and a reference line, orthogonal to the optical path of a projection lens are parallel. <P>SOLUTION: The image projector 1 comprises a projection machine 2 comprising a projection means 21 having an image generating part 21c and a light source unit 21a, a body case 22 storing the projection means 21, and the projection lens 23 protruded from the body case 22; and the screen 3, on which images generated by the projection means 21 are projected via the projection lens 23. The projection machine 2 is further provided with a screen surface parallelism adjustment means 6, extending to the projection surface 31 of the screen 3. When the images are projected to the screen 3 by the projection machine 2, the projection machine 2 is previously adjusted so that the reference line SL in X direction orthogonal to the optical axis L of the projection lens 23 and the projection surface 31 are made parallel by the screen surface parallelism adjustment means 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image projecting apparatus that projects an image on a screen by a projector such as an image projecting projector, and an image projecting method using the image projecting apparatus.

  Conventionally, based on image data from a playback device such as a personal computer or an optical disk, an image is formed in the image generation unit using light emitted from the light source unit by a projection unit having a light source unit and an image generation unit, There is a projector that projects the image onto a screen by a projection lens. In order to project an enlarged image on a screen using such a projector, for example, it is necessary to arrange the projector and the screen as shown in FIG. FIG. 14 is a plan view showing the positional relationship between the projector and the screen. That is, an axis SL (hereinafter referred to as a reference line) in the X direction (left and right direction when viewed from the front side of the projection lens 23) orthogonal to the optical axis L of the projection surface 31 of the screen 3 and the projection lens 23 of the projector 2 is used. ) To be parallel to each other, it is necessary to arrange the projector 2 and the screen 3.

  As shown in FIG. 15, the projector 2 may be arranged so that the optical axis L of the projection lens 23 is inclined upward (Z direction) with respect to the horizontal axis F (α angle). FIG. 15 is a side view showing the positional relationship between the projector and the screen. In this case, the image projected on the screen 3 is an inverted trapezoidal image with a large upper part. Generally, this image correction is performed in software corresponding to the inclination angle α. Yes. Therefore, in the present invention, image distortion in the Z direction is not considered.

  Conventionally, for example, it has a movable carriage that can move on a rail with respect to a projector installed in a hall, and a screen attached to the movable carriage. When projecting from the projector onto the screen, the movable carriage is moved. In some cases, the screen has a predetermined positional relationship with respect to the projector (see, for example, Patent Document 1).

In addition, an image generating unit that generates an image of a basic pattern, a projecting unit that projects an image generated by the image generating unit on a screen, an imaging unit that captures an image projected on the screen, and an image captured by the imaging unit There is provided a measuring unit that measures a distortion amount with respect to an image in which a basic pattern image is generated, and an image correction unit that corrects an image projected by the image projection unit according to the distortion amount (for example, Patent Documents). 2).
Japanese Patent Laid-Open No. 7-23449 Japanese Patent Laid-Open No. 10-200836

  However, in the configuration described in Patent Document 1, it is necessary to lay a movable carriage and a rail on which a screen is placed, and the configuration becomes extremely large, the equipment configuration becomes expensive, and a large hall is limited. Only available. Further, in the configuration described in Patent Document 2, the image projected by the image generating unit that generates the image of the basic pattern, the imaging unit, the measuring unit that measures the distortion amount with respect to the image generated by the basic pattern image, and the image projecting unit are corrected. Therefore, there is a problem in that an image correction unit or the like is separately required, and the configuration of the projector is complicated and expensive.

  The present invention has been made to solve the above-described problems, and is arranged with a simple configuration and at a low cost so that the projection surface of the screen and the reference line orthogonal to the optical axis of the projection lens are parallel to each other. An object of the present invention is to provide an image projection apparatus capable of performing the above.

  In order to achieve such an object, in the present invention, a projection unit including an image generation unit and a light source unit, a main body case that houses the projection unit, a projection lens that is derived from the main body case, and a projection unit. In the image projection apparatus comprising a screen for projecting the generated image via a projection lens, the projector is portable, further comprising screen surface parallel adjustment means mounted on the main body case, and the screen surface The parallel adjustment means has a pair of adjustment tools that can be expanded and contracted with respect to the projection surface of the screen. When projecting an image onto the screen by the projector, the adjustment tool is previously brought into contact with the screen, and the light of the projection lens is adjusted. Adjustment is made so that the reference line in the X direction orthogonal to the axis is parallel to the projection plane.

  According to this configuration, the reference line in the X direction perpendicular to the optical axis of the projection lens and the projection plane are set such that the adjustment tool of the screen plane parallel adjustment means is extended to the screen side and the tip thereof is in contact with the screen. If you adjust it so that it is parallel, you can set the screen and the portable projector very easily. Moreover, it is only necessary to provide on the projector side a screen surface parallel adjustment means having a pair of adjusters that can expand and contract with respect to the projection surface of the screen, and the configuration becomes extremely simple and inexpensive.

  In the present invention, a projection unit including an image generation unit and a light source unit, a main body case housing the projection unit, a projection lens derived from the main body case, and an image generated by the projection unit And a screen that projects the image through a projection lens. The projector further includes screen surface parallel adjustment means that extends with respect to the projection surface of the screen, and projects the image onto the screen by the projector. The screen surface parallel adjustment means is previously adjusted so that the reference line in the X direction orthogonal to the optical axis of the projection lens is parallel to the projection surface.

  According to this configuration, by adjusting the reference plane in the X direction orthogonal to the optical axis of the projection lens and the projection plane so that the tip of the screen plane parallel adjustment means is in contact with the screen, Setting the screen and projector is very easy. Moreover, it is only necessary to provide the screen surface parallel adjustment means on the projector side, and the configuration becomes extremely simple and inexpensive.

  In the present invention, the screen surface parallel adjustment means is detachably attached to the main body case.

  According to this configuration, the screen surface parallel adjustment means is detachably attached to the main body case. Therefore, if a plurality of types of screen surface parallel adjustment means are prepared as required, it can be selected as appropriate according to the application, and it is convenient because it is not bulky when carrying.

  In the present invention, the adjustment tool forms a mark so that when the adjustment tool expands and contracts in the direction of the projection plane, the extension length of the adjustment tool can be determined.

  According to this configuration, since the adjustment tool is marked, the extension / contraction length can be easily determined. Therefore, the adjustment can be easily performed, which is convenient.

  In the present invention, the adjustment tool is composed of a plurality of pipe-shaped relatively short adjustment members having different diameters, and the adjustment member is formed by combining the adjustment members so that they can be extended and contracted with a small diameter inside.

  According to this configuration, the adjustment tool is composed of a plurality of pipe-shaped relatively short adjustment members having different diameters, and the adjustment members are combined so as to be stretchable with the small diameter inside. Therefore, the adjustment tool can be stored in a compact manner like a swing basket, which is convenient.

  In the present invention, the adjustment tool is composed of an expandable tape-shaped adjustment member having a curved plane, and the adjustment member is formed so as to be retractable in the storage case.

  According to this configuration, the adjustment tool is composed of an extendable tape-shaped adjustment member having a curved plane, and the adjustment member is housed in the housing case so as to be drawn out. Therefore, the adjustment member can be stored compactly in the storage case, and a longer adjustment member can be easily created, which is convenient.

  In the present invention, a hook-shaped engagement piece is formed at the tip of the adjustment member.

  According to this configuration, since the hook-shaped engagement piece is formed at the tip of the adjustment tool, for example, the screen is fixed by engaging the engagement piece with the engagement portion provided on the screen side. be able to. Therefore, it is convenient that a small screen that is not fixed does not move during projection under the influence of convection such as indoor air conditioning.

  Further, in the present invention, the screen surface parallel adjustment means includes a pair of relatively meshing gears, and an adjustment tool that is attached to each of the gears and can be expanded and contracted in the direction of the projection surface. Along with the rotation of the gear, it is formed so as to be rotatable in the opposite direction at the same angle with the optical axis as the center.

  According to this configuration, the screen surface parallel adjustment means includes the pair of gears that are relatively meshed with each other, and the adjustment tool that is attached to each of the gears and that can expand and contract in the direction of the projection surface. With the rotation of the optical axis, the optical axis is formed to be rotatable in the opposite direction at the same angle with the optical axis as the center. Therefore, if the pair of adjusters is moved, the pair of adjusters spread out on the screen side in the opposite direction at the same angle if one adjuster is moved. convenient.

  The screen surface parallel adjustment means includes a pair of gears that are relatively meshed with each other, a rotating piece that is pivotally supported by a fixed shaft, and an adjusting tool that is attached to the rotating piece and is extendable in the direction of the projection surface. And a belt for connecting the gear and the rotating piece, and the adjuster is formed to be rotatable in the opposite direction around the optical axis at the same angle as the gear rotates.

  According to this configuration, the pair of relatively meshing gears, the rotating piece pivotally supported on the fixed shaft, the adjustment tool mounted on the rotating piece and extendable in the direction of the projection surface, The adjustment tool is formed so as to be rotatable in the opposite direction at the same angle around the optical axis as the gear rotates. Therefore, if one adjustment tool is moved, the other adjustment tool moves in the opposite direction at the same angle via the rotating piece, the belt, and the gear. As a result, the adjustment tool can be further expanded toward the screen side, so that a screen having a wide width in the horizontal direction can be handled. In addition, the screen and projector can be set with higher accuracy, which is convenient.

  Further, according to the present invention, an image projection comprising a projection unit having an image generation unit and a light source unit, a main body case that houses the projection unit, a projection lens derived from the main body case, and a screen. In the image projecting method for projecting an image generated by the projecting unit onto the screen through the projection lens using the apparatus, the projector further includes a screen surface parallel adjusting unit extending with respect to the projection surface of the screen, and the projection When projecting an image on a screen by a machine, the screen surface parallel adjustment means adjusts in advance so that the reference line in the X direction orthogonal to the optical axis of the projection lens is parallel to the projection surface, and also projects the image. Sometimes the screen is fixed by means of screen surface parallel adjustment.

  According to this configuration, when the image is projected onto the screen by the projector, the reference plane in the X direction orthogonal to the optical axis of the projection lens and the projection plane are made parallel by the screen plane parallel adjustment unit in advance. While adjusting, the screen is fixed by the screen surface parallel adjustment means at the time of image projection. Accordingly, it is convenient that an unfixed small screen or the like does not move during projection by convection such as indoor air conditioning.

  According to the present invention, it is possible to obtain an image projection apparatus that can be arranged with a simple configuration at a low cost so that the projection surface of the screen and the reference line orthogonal to the optical axis of the projection lens are parallel to each other.

(First embodiment)
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram showing a component configuration of a projector used in an image projection apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of the projector shown in FIG. 1, and FIGS. 3 and 4 are FIG. 3 is a perspective view of the projector shown in FIG. 3. FIG. 3 shows a state in which the screen surface parallel adjustment means is housed, and FIG. 4 shows a state in which the screen surface parallel adjustment means is extended to the screen side. FIG. 5 is a schematic configuration diagram illustrating an example of the screen surface parallel adjustment unit, and FIG. 6 is a plan view illustrating a schematic configuration of the image projection apparatus.

  As shown in FIG. 6, the image projection apparatus 1 includes, for example, a portable projector 2 that can be easily moved, and a screen 3 that projects an image from the projector 2. As shown in FIG. 1, the projector 2 includes a projection unit 21, a main body case 22 that houses the projection unit 21, a projection lens 23 derived from the front side of the main body case 22, a power supply 24, the projection unit 21, and the like. It comprises a cooling fan 25 for cooling the air and a control board 26 for controlling them. The projection means 21 is formed of a light tunnel 21b that guides and emits light emitted from the light source unit 21a, and an image generation unit 21c that forms an image using light emitted from the light tunnel 21b.

  In addition to the above-described configuration, the projector 2 includes a control unit 4 that controls the projection unit 21, the power supply unit 24, the cooling fan 25, and the like, as shown in FIG. This control means 4 has a memory 41 for temporarily storing programs for controlling various operations and data from the outside. The control unit 4 is connected to an input unit 5 for a user to input various commands. The control means 4 is mounted on the control board 26 shown in FIG.

  As shown in FIGS. 3 and 4, for example, on the bottom surface side of the main body case 22, the reference line SL in the X direction orthogonal to the optical axis L (see FIG. 6) of the projection lens 23, the projection surface 31 of the screen 3, The screen surface parallel adjustment means 6 for adjusting so as to be parallel is detachably mounted. The screen surface parallel adjustment means 6 has a pair of adjusters 61 that can expand and contract with respect to the projection surface 31 of the screen 3 that is in the same Y direction as the optical axis L, for example, extends parallel to the optical axis L. For example, as shown in FIG. 5, the adjustment tool 61 includes a plurality of pipe-shaped relatively short adjustment members 61 a, 61 b, 61 c having different diameters, and a tip member 61 d, and the adjustment members 61 a, 61 b, 61c is formed so as to be able to expand and contract with the small diameter inside, and is formed into a swinging hook shape. For example, the distance from the front surface of the main body case 22 is marked as a measure so that the adjustment tool 61 can determine the extension length of the adjustment tool 61 when the projection surface 31 extends and contracts in the Y direction. 7 is formed.

  Next, a case where the projector 2 and the screen 3 are set in the present embodiment having the above configuration will be described. First, the projector 2 equipped with the screen surface parallel adjustment means 6 and the screen 3 are set in advance at predetermined positions as shown in FIG. Thereafter, the pair of adjusting tools 61 of the screen surface parallel adjusting means 6 are extended in the Y direction so as to contact the screen 3. At this time, the mark 7 of each adjustment tool 61 is confirmed, the adjustment tools 61 are adjusted to have the same length, the reference line SL in the X direction orthogonal to the optical axis L of the projection lens 23, and the projection Adjustment is made so that the surface 31 is parallel.

  When the screen 3 is, for example, a small suspension type and the lower end is not fixed and the screen moves during projection by convection such as indoor air conditioning, after setting, that is, when projecting an image Also, the adjustment tool 61 is extended to the screen 3 side and fixed, for example, in a state where the tip thereof is in contact with the screen 3.

  With this configuration, the screen 3 is fixed by the screen surface parallel adjustment means when the image is projected. Therefore, the screen 3 does not move due to convection such as air conditioning in the room at the time of image projection, which is convenient.

  In the present embodiment having the above-described configuration, the adjustment tool 61 of the screen surface parallel adjustment means 6 extends to the screen 3 side, and its tip abuts against the screen 3, so that the X direction orthogonal to the optical axis L of the projection lens 23 is obtained. If the reference line SL and the projection surface 31 are adjusted to be parallel to each other, there is an effect that the screen 3 and the portable projector 2 can be set very easily. Moreover, it is only necessary to provide the screen surface parallel adjustment means 6 having a pair of adjusting tools 61 that can be expanded and contracted with respect to the projection surface 31 of the screen 3 on the projector 2 side, and the configuration becomes extremely simple and inexpensive. Become.

  The screen surface parallel adjustment means 6 is detachably attached to the main body case 22. Therefore, if a plurality of types of screen surface parallel adjustment means 6 are prepared as required, it can be selected appropriately according to the application, and it is convenient because it is not bulky when carried.

  In addition, since the adjustment tool 61 has the mark 7, the extension / contraction length can be easily determined. Therefore, the adjustment can be easily performed, which is convenient.

  The adjusting tool 61 is composed of a plurality of pipe-shaped relatively short adjusting members 61a, 61b, 61c having different diameters, and the adjusting members 61a, 61b, 61c are retractable with a small diameter inside. Combined. Therefore, the adjustment tool 61 can be housed in a compact manner like a swing basket, which is convenient.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a schematic perspective view showing the main part of the adjustment tool of the screen surface parallel adjustment means in the image projection apparatus according to the second embodiment of the present invention, FIG. 8 is a front view showing an example of the screen, and FIG. FIG. 9 is a side view of the screen shown in FIG. 8. 7 to 9, the portions denoted by the same reference numerals as those in FIGS. 1 to 6 described above are substantially the same, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described embodiment will be mainly described.

  In the present embodiment, as shown in FIG. 7, the adjustment tool 61 is composed of a telescopic tape-shaped adjustment member 61 e having a curved plane, and the adjustment member 61 e can be drawn into the storage case 62, for example, as shown in the figure. It is formed so that it is always stored in a wound state by a spring force that does not. For example, a hook-shaped engagement piece 63 is formed at the tip of the adjustment member 61e. For example, when the screen 3 is fixed, the engaging piece 63 is provided in the case 32 that houses the projection curtain that forms the projection surface 31 of the screen 3 shown in FIGS. 8 and 9 as in the embodiment described above. The engaging portion 33 is engaged. Although not shown, the adjustment tool 61 may be provided with a stoper function so that the adjustment member 61e can be maintained in a state where the adjustment member 61e is extended to a predetermined length.

  According to the present embodiment having the above-described configuration, the adjustment tool 6 includes the telescopic tape-shaped adjustment member 61e having a curved plane, and the adjustment member 61e is accommodated in addition to the same effects as the above-described embodiment. The case 62 is housed so that it can be pulled out. Therefore, the adjustment member 61e can be conveniently stored in the storage case 62, and a longer one can be easily created as the adjustment member 61e.

  Further, since the hook-shaped engagement piece 63 is formed at the tip of the adjustment member 61e, for example, by engaging the engagement piece 63 with the engagement portion 33 provided on the screen 3 side, the screen 3 Can be fixed easily. Therefore, it is convenient that the small screen 3 that is not fixed does not move during projection by convection such as indoor air conditioning.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a schematic configuration diagram showing the main part of the adjustment tool of the screen surface parallel adjustment means in the image projection apparatus according to the third embodiment of the present invention, and FIG. 11 is a side view of the screen surface parallel adjustment means shown in FIG. It is. 10 and 11, the portions denoted by the same reference numerals as those in FIGS. 1 to 9 described above are substantially the same, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described embodiment will be mainly described.

  In this embodiment, as shown in FIGS. 10 and 11, the screen surface parallel adjustment means 6 is attached to each of a pair of gears 64 and gears 64 that are relatively meshed with each other, and can be expanded and contracted in the direction of the projection surface 31. For example, it has the adjustment tool 61 as shown in FIG. 5 used by 1st Embodiment mentioned above. The adjusters 61 are integrally fixed to the gears 64, respectively, and are configured to rotate in opposite directions around the optical axis L at the same angle as the gear 64 rotates.

  According to the present embodiment having the above-described configuration, the screen surface parallel adjustment means 6 is mounted on each of the pair of gears 64 and the gears 64 that are relatively engaged, in addition to the same effects as the above-described embodiment. An adjustment tool 61 that can be expanded and contracted in the direction of the projection surface is formed, and the adjustment tool 61 is formed to be rotatable about the optical axis L at opposite angles at the same angle as the gear 64 rotates. Accordingly, when the one adjustment tool 61 is moved, the adjustment tool 61 spreads in a fan shape toward the screen side in opposite directions at the same angle, so that the screen and the projector 2 can be more accurately arranged. Can be set up conveniently.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a schematic configuration diagram showing the main part of the adjustment tool of the screen surface parallel adjustment means in the image projection apparatus according to the fourth embodiment of the present invention, and FIG. 13 is a side view of the screen surface parallel adjustment means shown in FIG. It is. In FIGS. 12 and 13, the portions denoted by the same reference numerals as those in FIGS. 1 to 11 described above are substantially the same, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described embodiment will be mainly described.

  In the present embodiment, as shown in FIGS. 12 and 13, the screen surface parallel adjustment means 6 includes a pair of gears 64 that are relatively meshed with each other and a rotating piece 66 that is rotatably supported by a fixed shaft 65. And an adjustment tool 61 that is attached to the rotation piece 66 and can be expanded and contracted in the direction of the projection surface 31, and a belt 67 that connects the gear 64 and the rotation piece 66. With the rotation of the optical axis L, the optical axis L can be rotated in the opposite direction at the same angle.

  According to this embodiment having the above-described configuration, the same effect as the above-described embodiment can be obtained. In addition, the pair of adjusting tools 61 can move the rotating piece 66, the belt 67, and the gear 64 by moving one adjusting tool 61. Accordingly, the other adjustment tool 61 moves in the opposite direction at the same angle. As a result, the adjustment tool 61 can be greatly expanded toward the screen side, so that it is possible to deal with a screen that is wider in the horizontal direction than in the third embodiment described above. In addition, the screen and the projector can be set with higher accuracy, which is convenient.

  The above-described embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the mobile screen in which the projection curtain is suspended from the column supported by the tripod has been described as the screen 3, but for example, a fixed type in which the projection curtain is suspended from a wall or the like. Of course, the present invention may be applied to such a case.

It is a block diagram which shows the components structure of the projector used for the image projector which concerns on one Embodiment of this invention. It is a block diagram of the projector shown in FIG. It is a perspective view of the projector shown in FIG. 1, and shows the state which accommodated the screen surface parallel adjustment means. It is a perspective view of the projector shown in FIG. 1, and shows the state which extends a screen surface parallel adjustment means to the screen side. It is a schematic block diagram which shows an example of a screen surface parallel adjustment means. It is a top view which shows schematic structure of the image projector which concerns on one Embodiment of this invention. It is a schematic structure perspective view which shows the other example of the principal part of the adjustment tool of the screen surface parallel adjustment means in the image projector which concerns on 2nd Embodiment of this invention. It is a front view which shows an example of a screen. It is a side view of the screen shown in FIG. It is a schematic block diagram which shows the principal part of the adjustment tool of the screen surface parallel adjustment means in the image projector which concerns on 3rd Embodiment of this invention. It is a side view of the screen surface parallel adjustment means shown in FIG. It is a schematic block diagram which shows the principal part of the adjustment tool of the screen surface parallel adjustment means in the image projector which concerns on 4th Embodiment of this invention. It is a side view of the screen surface parallel adjustment means shown in FIG. It is a top view which shows the arrangement | positioning relationship between a projector and a screen. It is a side view which shows the arrangement | positioning relationship between a projector and a screen.

Explanation of symbols

L Optical axis SL Reference line 1 Image projector 2 Projector 21 Projector 21a Light source unit 21c Image generator 22 Main body case 23 Projector lens 3 Screen 31 Projection surface 33 Engagement unit 6 Screen surface parallel adjustment means 61 Adjuster 61a Adjustment member 61b Adjustment member 61c Adjustment member 61e Adjustment member 62 Storage case 63 Engagement piece 64 Gear 65 Fixed shaft 66 Rotation piece 67 Belt 7 Mark

Claims (10)

A projector comprising an image generator and a light source unit; a main body case housing the projection means; a projection lens derived from the main body case; and an image generated by the projection means, In an image projection apparatus comprising a screen that projects through a projection lens,
The projector is portable, and further includes a screen surface parallel adjustment unit mounted on the main body case, and the screen surface parallel adjustment unit is a pair of adjusters that can expand and contract with respect to the projection surface of the screen. And when the image is projected onto the screen by the projector, the adjustment tool is previously brought into contact with the screen, and a reference line in the X direction perpendicular to the optical axis of the projection lens, and the projection surface And an image projecting apparatus that adjusts to be parallel to each other. A projection unit including an image generation unit and a light source unit; a main body case that houses the projection unit; a projection lens derived from the main body case; and an image generated by the projection unit. In an image projection apparatus comprising a screen that projects through a lens,
The projector further includes screen surface parallel adjustment means extending with respect to the projection surface of the screen, and when projecting an image onto the screen by the projector, the projection surface of the projection lens is previously adjusted by the screen surface parallel adjustment means. An image projection apparatus, wherein adjustment is performed so that a reference line in the X direction orthogonal to the optical axis is parallel to the projection plane.   The image projection apparatus according to claim 1, wherein the screen surface parallel adjustment unit is detachably attached to the main body case.   The image projection according to claim 1, wherein the adjustment tool is formed with a mark so that when the adjustment tool expands and contracts in the direction of the projection surface, the extension length of the adjustment tool can be determined. apparatus.   The adjustment tool is composed of a plurality of pipe-shaped relatively short adjustment members having different diameters, and the adjustment members are combined so as to be stretchable with a small diameter inside. The image projection device according to claim 1, claim 2, or claim 4.   The said adjustment tool consists of an expansion-contraction-type tape-shaped adjustment member with which the plane was curved, The said adjustment member is accommodated in the storage case so that extraction | drawer is possible, The claim 1, 2 or Claim characterized by the above-mentioned. Item 5. The image projection device according to any one of Items 4 to 5.   The image projection apparatus according to claim 5, wherein a hook-shaped engagement piece is formed at a tip of the adjustment member.   The screen surface parallel adjustment means includes a pair of relatively meshing gears, and an adjustment tool that is attached to each of the gears and can be expanded and contracted in the direction of the projection surface. 4. The image projection apparatus according to claim 1, wherein the image projection apparatus is formed to be rotatable in opposite directions at the same angle with the optical axis as a center along with the rotation. 5.   The screen surface parallel adjustment means includes a pair of relatively meshing gears, a rotating piece pivotally supported on a fixed shaft, and attached to the rotating piece, and is extendable in the direction of the projection surface. An adjustment tool, and a belt connecting the gear and the rotating piece, and the adjustment tool can rotate in the opposite direction around the optical axis at the same angle as the gear rotates. The image projection apparatus according to claim 1, wherein the image projection apparatus is formed as described above. Using a projection unit having an image generation unit and a light source unit, a main body case housing the projection unit, a projector including a projection lens derived from the main body case, and an image projection apparatus including a screen, In an image projection method for projecting an image generated by a projection unit onto the screen via the projection lens,
The projector further includes screen surface parallel adjustment means extending with respect to the projection surface of the screen, and when projecting an image onto the screen by the projector, the projection surface of the projection lens is previously adjusted by the screen surface parallel adjustment means. The image is adjusted so that a reference line in the X direction orthogonal to the optical axis is parallel to the projection surface, and the screen is fixed by the screen surface parallel adjustment means when the image is projected. Projection method.