JP5704443B2 - Projector device - Google Patents

Description

  The present invention relates to a projector apparatus, and more particularly to a projector apparatus that projects an image light beam on a screen by a projection optical system.

  A projector is known as an apparatus that displays an image or video by projecting it onto a screen or the like. There are various types of projectors, but in recent years, a relatively large number of liquid crystal projectors that use liquid crystals to enlarge and project images. When using a projector such as a liquid crystal projector, when projecting an image on a projection surface such as a screen, the projected image may be misaligned, distorted, or out of focus depending on the installation position and projection angle of the projector. .

  In addition, among the misalignment, distortion, and focus unevenness of the projection screen, there is a problem associated with each other such that the projection position is shifted when the distortion of the screen is corrected.

  There is so-called trapezoidal distortion as a distortion of a typical projected image, but this trapezoidal distortion is canceled by distorting the original image into an electronic technique using image processing, that is, a trapezoidal distortion symmetrical to the generated trapezoidal distortion. Thus, a relatively large number of keystone corrections for correcting trapezoidal distortion are performed (see, for example, Patent Document 1).

  In addition, for example, in Patent Document 2, a movement amount when a projection device such as a projector is moved is measured, a projection state such as an optimum projection direction at the position is calculated, and the optimum projection state is obtained. Calculating a change amount from the current projection state of the projector, and changing a projection state such as a projection direction, a light amount, an in-focus position, and an angle of view of an image to an optimal state based on the calculated change amount of the projection state Is disclosed.

  By the way, if the keystone correction using the electronic control method is used to correct the trapezoidal distortion of the projection image, the display image becomes partially rough, which is not preferable from the viewpoint of image quality. Further, if the movement amount is measured and the change amount to the optimum projection state is calculated in the projection image generation unit, the device such as the image generation unit or the projection lens unit becomes complicated, leading to an increase in the cost of the device.

  The present invention has been made under such circumstances, and an object of the present invention is to provide a projector device that can easily adjust the distortion of a projected image, in particular, without using an electronic control method. .

According to the first aspect of the present invention, there is provided a projector device that projects an image light beam onto a screen by a projection optical system, and includes a base part, the projection optical system, and the screen with respect to the base part. A projector main body rotatable about a first axis parallel to a line of intersection with a horizontal plane, wherein the projection optical system includes a reflective optical member that reflects the image light beam toward the screen, and the projector Due to the rotation of the main body about the first axis, from the middle point of the lower edge of the outer peripheral outline of the projected image on the screen in the first axis direction of the upper end where the image light beam enters the reflective optical member The center point rotates around the first axis with the distance as a radius so that the distance to the center point can be kept constant, and the height position of the lower side of the outer peripheral outline is changed. Do not let The symmetrical trapezoidal distortion in the vertical asymmetrical projected image projector apparatus, wherein a is corrected, is provided.

  Here, the outer peripheral outline frame line of the projected image means an outline line of an image serving as a boundary line between the image on the screen and its periphery. For example, when a rectangular image as a whole is projected on the screen, the outer peripheral outline frame line becomes a rectangular frame-like line. In this specification, the term “outer outline frame line” of the projected image is used in this sense.

  According to this, by rotating (swinging) the projector main body around the first axis with respect to the base while viewing the projection screen on the screen, Without changing the position of the lower side in the height direction, it is possible to correct a trapezoidal distortion that is asymmetrical in the vertical direction of the projected image.

It is a figure for demonstrating the structure of the projector apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the projector main-body part and housing | casing which a projector apparatus has. It is a figure for demonstrating the image production | generation apparatus and lens part in a projector main-body part. It is a figure for demonstrating the projector main-body part and support apparatus which a projector apparatus has. It is a figure for demonstrating an example of the projection method using a projector apparatus. FIG. 6A to FIG. 6C are diagrams for explaining an example of distortion of a projected image. It is FIG. (1) for demonstrating the correction method of the projection image using an adjustment apparatus. It is FIG. (2) for demonstrating the correction method of the projection image using an adjustment apparatus. It is FIG. (3) for demonstrating the correction method of the projection image using an adjustment apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an external perspective view of a projector apparatus 1000 according to an embodiment. In the following, the vertical axis, that is, the surface on which the projector apparatus 1000 is placed (for example, the upper surface of the table TB (see, for example, FIG. 5) or the floor surface) is assumed to be parallel to the horizontal plane, and the vertical axis orthogonal to the horizontal plane is assumed. The description will be made assuming that the direction is the Z-axis direction, the direction in the horizontal plane parallel to the longitudinal direction of the lower casing 1200 described later is the Y-axis direction, and the direction orthogonal to the Z-axis and the Y-axis is the X-axis direction.

  As shown in FIG. 1, the projector device 1000 includes a lower housing 1200, an upper housing 1100, a reflection mirror 130, and a projection mirror 140.

  FIG. 2 is an exploded perspective view in which the upper housing 1100 and the lower housing 1200 are separated from the remaining portions. The upper housing 1100 is a substantially box-shaped member (a rectangular parallelepiped hollow member) having an open bottom surface (surface on the −Z side). The upper housing 1100 has a circular opening serving as an image light exit on the upper surface (+ Z side) and an opening for allowing the reflecting mirror 130 and its support mechanism 170 (not shown in FIG. 2, see FIG. 1) to pass therethrough. Have. The upper housing 1100 has a mirror cover 190 that accommodates most of a support mechanism 180 (not shown in FIG. 2; see FIG. 1) for supporting a projection mirror 140 described later on the −X side surface. On the upper and lower surfaces of the mirror cover 190, openings for allowing the projection mirror 140 to pass are provided.

  The lower housing 1200 is a hollow rectangular parallelepiped member having an open upper surface and is placed on a floor surface or a table surface.

  In addition to the upper housing 1100 and the lower housing 1200, the projector apparatus 1000 will be described later with respect to the projector main body 100 housed in most of the housings 1100 and 1200, and the projector main body 100. And a support mechanism 200 that rotatably supports the first axis, the second axis, and the third axis. Actually, the projector main body 100 and the upper casing 1100 can rotate around the three axes with respect to the lower casing 1200.

The projector main body 100 includes a main body 110, a reflection mirror 130 that reflects image light (light beam) emitted from a projection lens unit 120 built in the main body 110, and a light beam reflected by the reflection mirror 130 to be projected on a screen or the like. It includes a projection mirror 140 that reflects onto the surface. Each of the reflection mirror 130 and the projection mirror 140 is attached to the main body 110 via the support mechanisms 170 and 180 described above.

  The projector main body 100 is disposed such that the exit end of the projection lens unit 120 disposed on the upper surface (+ Z side) of the main body 110 corresponds to the circular opening of the upper housing 1100. In FIG. 2, the support mechanisms 170 and 180 for holding the reflection mirror 130 and the projection mirror 140 are omitted for convenience.

  Further, as shown in FIG. 3, the projector main body 100 includes, for example, an illumination optical system 100a including a light source, an image forming panel 100b, a lens system 100c including a projection lens unit 120, and a main system that controls them. A control device 100d and the like are included. Main controller 100d is connected to an external device 2000 such as a personal computer. The main controller 100d is connected to an operation unit 3000 including various operation buttons.

  The projector main body 100 controls the illumination optical system 100a and the image forming panel 100b by the main control device 100d according to the information related to the image received from the external device 2000, so that the projection light (light beam) corresponding to the necessary image is obtained. Is emitted toward the reflection mirror 130 via the lens system 100c (projection lens unit 120).

  The lens system 100c is composed of, for example, a plurality of optical elements, and some of the optical elements are movable. The main control device 100d enlarges / reduces and focuses the image projected on the projection surface by moving the movable optical element in the direction of the optical axis, for example, in accordance with a command input from the operation unit 3000. In other words, the image is zoomed and focused.

  As illustrated in FIG. 4, the support mechanism 200 includes a holding member 220, a first relay board 230, a second relay board 240, an installation table 250, and the like. The support mechanism 200 is housed together with the main body 110 in the upper housing 1100 and the lower housing 1200.

  The holding member 220 includes a bottom wall portion 221 having a rectangular shape in plan view, and two rising portions 222a and 222b that rise in the Z-axis direction from both ends of the bottom wall portion 221 in the Y-axis direction, as viewed from the −X side. It consists of a member which has U shape. The holding member 220 is fixed to the main body 110 so as to sandwich the main body 110 in the Y-axis direction. One (−Y side) rising portion 222a is longer than the other (+ Y side) rising portion 222b, and is approximately twice as long. The other rising portion 222b is provided with one circular screw hole 223, and the one rising portion 222a is provided with two circular screw holes 223 separated by a predetermined distance in the Z-axis direction. The screw hole 223 below the rising portion 222a is located coaxially with the screw hole 223 of the rising portion 222b (positioned on the same straight line in the Y-axis direction).

  The first relay board 230 includes a bottom wall portion 231 having a rectangular shape in plan view, two rising portions 232a and 232b rising in the Z-axis direction from the vicinity of the center in the X-axis direction at both ends of the bottom wall portion 231 in the Y-axis direction, And a pair of side wall portions 234 that rise in the Z-axis direction from almost the entire region of both end portions of the wall portion 231 in the X-axis direction. One (−Y side) rising portion 232a is longer than the other (+ Y side) rising portion 232b, and is approximately twice as long. Here, in one rising portion 232a, two arc-shaped first groove portions (penetrating grooves) 236 corresponding to the two screw holes 223 formed in the rising portion 222a are formed. An arc-shaped first groove portion (through groove) 236 corresponding to the screw hole 223 formed in the rising portion 222b is formed in the other rising portion 232b facing the groove portion 236. Screws formed at the tip portions of the three pins 224 through the three first groove portions 236 are screwed into the opposing screw holes 223, so that the first relay substrate 230 holds the holding member 220 in the Y-direction. It is attached to the main body 110 of the projector main body 100 so as to be sandwiched in the axial direction. Here, in a state where the first relay board 230 is attached to the holding member 220 and the main body 110 by the three pins 224, the holding member 220 and the main body 110 have the three first pins via the three pins 224. The holding member 220 and the first relay board 230 are connected so as to have some play (backlash) in the Y-axis direction so that they are driven along the groove 236.

  In addition, the pair of side wall portions 234 prevents each side wall portion 234 and the bottom wall portion 221 of the holding member 220 from interfering even when the holding member 220 is driven along the first groove portion 236 via the pin 224. The height is set. The pair of side wall portions 234 are provided with a pair of second groove portions (penetrating grooves) 238 facing each other. The shapes of the first groove 236 and the second groove 238 will be described in detail later.

  The second relay substrate 240 includes a bottom wall portion 244 having a rectangular shape in plan view having three third groove portions 242 and a pair of side wall portions 246 that are folded back across the entire X-axis direction both ends of the bottom wall portion 244. Yes. The three third groove portions 242 are respectively disposed at a position in the + X side half near the center in the Y axis direction of the bottom wall portion 244 and a position in the vicinity of both ends in the Y axis direction in the −X side half. In addition, semicircular convex portions are provided opposite to each other at both ends in the Y-axis direction of the pair of side wall portions 246. Circular holes 248 are formed coaxially on the convex portions facing each other. Each circular hole 248 is provided at a position that can face each of the four second groove portions 238 of the first relay substrate 230.

  The second relay substrate 240 is connected to the first relay substrate 230 by pins 249 that pass through the circular holes 248 of the pair of side wall portions 246 and the second groove portions 238 of the pair of side wall portions 234 of the first relay substrate 230. . Two pins 249 are used corresponding to the arrangement of the circular holes 248 and the second grooves 238. Each pin 249 has a length that communicates from the −X side circular hole 248 to the + X side circular hole 248 facing the circular hole 248, and connects the first relay board 230 and the second relay board 240. In such a state, for example, nuts (not shown) are attached to both ends to prevent them from coming off. Therefore, the first relay substrate 230 is driven along the four second groove portions 238 via the two pins 249 that communicate the circular hole 248 and the second groove portion 238. Here, the first relay board 230 and the second relay board 240 are connected to each other by the pins 249 so that the first relay board 230 is driven along the second groove 238. The second relay board 240 is connected so that there is some play (backlash) in the X-axis direction. The shape of the third groove part 242 of the bottom wall part 244 will be described in detail later.

  The installation base 250 is made of a plate member having a rectangular shape in plan view, and has a plurality of (for example, three) screw holes 252 through which the pins 210 penetrate at positions facing the third groove portions 242. The pin 210 has a thread groove at the tip, and is screwed into the screw hole 252 of the installation base 250 so as to sandwich the second relay substrate 240. Here, the second relay board 240 has three pins so that there is some play (backlash) in the Z-axis direction so that the second relay board 240 is moved along the third groove portion 242. 210 is connected to the installation table 250.

  The bottom surface of the installation base 250 is fixed to the upper surface of the lower housing 1200. As a method of fixing the installation base 250 and the lower casing 1200, for example, adhesion with an adhesive may be used. A screw hole that is screwed into a screw groove provided at the tip of the pin 210 is formed in the lower casing 1200. It may be provided at a position corresponding to 252 and connected together with the installation table 250. The installation base 250 is not necessarily provided. For example, a screw hole is provided in the lower housing 1200 at a position corresponding to the pin 210, and the second relay substrate 240 and the lower housing are screwed to the pin 210. 1200 may be connected.

  Next, as an example, an operation when correcting distortion of an image projected on the screen 2100 that is the projection surface shown in FIG. 5 will be described. In this embodiment, it is only necessary to change (adjust) the posture (rotation, tilt) of the projector main body 100 when correcting the distortion. For this purpose, for example, a cam mechanism or other mechanism is incorporated in the support mechanism 200 described above, and an operation (not shown) is performed. The posture (rotation, inclination) of the projector main body 100 may be changed (adjusted) via a button or the like. For example, the cam device may drive a gear connected to the cam device by driving an operation button (rotating a knob) so that the attitude of the projector main body 100 can be manually changed (adjusted). By driving the operation button, the motor connected to the cam device may rotate so that the attitude of the projector main body 100 can be changed (adjusted). Since these mechanisms for driving the projector main body 100 have little relation to the essence of the present invention, in the following, in order to simplify the description, it is assumed that the user of the projector device 1000 directly moves the projector main body 100. The explanation will be given as a premise. Actually, both of these move around the three axes with respect to the lower casing 1200 in a state where the upper casing 1100 is attached to the projector main body 100. The description will be made assuming that 100 moves.

  FIG. 5 shows an example of a usage state of the projector apparatus 1000 according to the present embodiment. As shown in FIG. 5, the projector device 1000 is placed on the upper surface of a table TB facing the screen 2100 and parallel to the XY plane. Here, it is assumed that the screen 2100 is arranged exactly parallel to the YZ plane. The trapezoidal distortion described later actually occurs even when the screen 2100 is inclined with respect to the YZ plane, but in the following description, the trapezoidal distortion is caused only by the factor on the projector device 1000 side. Shall occur.

  Based on image information input from an external device 2000 such as a personal computer, projection light (light beam) corresponding to an image generated by an image panel inside the projector device 1000 is reflected via the projection lens unit 120 of the lens system 100c. The light is emitted toward the mirror 130. The light beam is reflected by the reflection mirror 130, then reflected by the projection mirror 140, and projected onto the screen 2100. As a result, an image is projected on the screen 2100. That is, in the present embodiment, a projection optical system that includes the lens system 100c, the reflection mirror 130, and the projection mirror 140, and projects the image light beam on the screen is configured.

  Here, the projection image may be distorted into a trapezoid as shown in FIGS. 6A and 6B depending on the installation position and the projection angle of the projector apparatus 1000. In the following, the vertical asymmetric and left-right symmetrical trapezoidal distortion of the projected image 2200 shown in FIG. 6A is referred to as “vertical trapezoidal distortion”, and the vertically symmetrical left-right asymmetric trapezoid of the projected image 2200 shown in FIG. The distortion is referred to as “horizontal trapezoidal distortion”. In the following, for convenience of explanation, the outer peripheral outline frame line of the projection image will be described using the same reference numeral 2200 as that of the projection image.

  6A shows a projection image 2200 in which the projector device 1000 is displaced from the proper position around the Y axis, and FIG. 6B shows a projection image 2200 in which the projector device 1000 is displaced from the proper position around the Z axis. It is shown. FIG. 6C shows a projection image 2200 in which the projector device 1000 is displaced from the proper position around the X axis. In the following, the midpoint of the lower side of the outer peripheral outline frame line 2200 of the projection image shown in FIG. 7 is “A point”, and the upper end point where the reflected light beam from the reflection mirror 130 on the reflection surface of the projection mirror 140 is incident ( The center position of the + Z side) in the Y axis direction is “D point”, the distance from point A to D point is the projection distance “R”, and the axis passing through point A and parallel to the Y axis is “first”. The first axis, the axis passing through point A and parallel to the Z axis is called “second axis”, and the straight line passing through point D and projecting the normal of the reflecting surface of the projection mirror 140 onto the horizontal plane is called “third axis”.

  As shown in FIG. 8, when the four vertices (on the −Y side surface) of the main body 110 of the projector main body portion 100 are at the positions a, b, c, and d, respectively, when viewed from the −Y direction. Assume that the height direction (Z-axis direction) position of the outer peripheral outline frame line 2200 of the projected image projected on the screen 2100 is located at the B point and the lower end at the A point. At this time, the projected image projected on the screen is projected at the position shown in FIG. 6A, and vertical trapezoidal distortion occurs. Here, the projector main body 100 in FIG. 8 is shown without supporting mechanisms 170 and 180 for supporting the mirror in order to prevent complication of the drawing.

  In order to correct the vertical trapezoidal distortion of the projection image 2200, the user observes the image on the screen so that the upper and lower lengths of the outer peripheral outline 2200 of the projection image are substantially the same length. The rotation angle around an axis parallel to the Y axis is adjusted. In this case, the projector main body 100 is configured to be movable along the first groove 236 via the holding member 220, the first relay substrate 230, and the pin 224, so that the moving direction of the projector main body 100 is the first groove 236. Set by shape. In the present embodiment, the shape of the first groove portion 236 is such that when the projector apparatus 1000 is disposed at a predetermined position, the projector body portion 100 can be rotated even if the projector main body portion 100 is rotated about an axis parallel to the Y axis via the support mechanism 200. It is designed so that the projection distance R can be kept constant without changing the position (without changing the height of the lower end of the outer peripheral outline frame line 2200 of the projection image). That is, when correcting the vertical trapezoidal distortion, the point D is rotated by the radial projection distance R around the first axis. That is, the first groove 236 is formed in an arc shape that is a part of a circle having the center as the first axis so that the projector main body 100 can rotate around the first axis. Therefore, the apexes a, b, c, and d on the −Y side surface of the projector device 1000 are moved along the first groove portions to be a ′, b ′, c ′, and d ′ positions, respectively, and are projected onto the screen 2100. As for the position in the height direction of the outer peripheral outline frame line 2200 of the image, the upper end is the B ′ point, and the lower end is the A point position.

  Next, as shown in FIG. 9, when the four vertices (on the + Z side surface) of the main body 110 of the projector main body 100 are at the positions e, f, g, and h, respectively, in a plan view as viewed from the + Z direction. The projected image 2200 projected on the screen 2100 is projected at the position shown in FIG. 6B, and horizontal trapezoidal distortion occurs.

  In order to correct the horizontal trapezoidal distortion of the projection image 2200, the user observes the video on the screen so that the left and right lengths of the outer peripheral outline frame 2200 of the projection image are substantially the same length. The rotation angle around the axis parallel to the Z axis is adjusted. In this case, the projector main body 100 is configured to be movable along the third groove portion 242 via the holding member 220, the first relay board 230, the second relay board 240, and the pin 210. , Set by the shape of the third groove 242. In the present embodiment, the shape of the third groove 242 is such that when the projector device 1000 is disposed at a predetermined position, the projector main body 100 can be rotated on an axis parallel to the Z axis via the support mechanism 200. The projection distance R is designed to be constant without changing the position (point A position) of the center line in the left-right direction of the outer peripheral outline frame line 2200 of the projected image. That is, when correcting the horizontal trapezoidal distortion, the point D is rotated around the second axis by a radial projection distance R (strictly, the length of projection of the line segment AD on the XY plane). That is, the third groove portion 242 is formed in an arc shape that is a part of a circle whose center is the second axis so that the projector body 100 can be rotated about the second axis. Therefore, the vertices e, f, g, and h on the + Z side surface of the projector apparatus 1000 are moved along the third groove portion to be positions e ′, f ′, g ′, and h ′, respectively. The position of the center line in the left-right direction of the line 2200 (position of point A) remains constant.

  Further, when the projection image 2200 is tilted as shown in FIG. 6C, the user can adjust the tilt of the projection image 2200 in the screen plane while viewing the video on the screen. The main body 100 is rotated around the third axis. In this case, the projector main body 100 is configured to be movable along the second groove 238 via the holding member 220, the first relay substrate 230, and the pin 249. The moving direction is set by the shape of the second groove portion 238. As an example, the shape of the second groove portion 238 causes the projector main body 100 to move along the second groove portion 238 when the projector device 1000 is disposed at a predetermined position. It is designed to rotate around the third axis without changing the position of point D even when driven.

  As described above, according to the projector device 1000 according to the present embodiment, the user rotates the projector main body 100 about the first axis, the second axis, and the third axis while viewing the screen 2100. Thus, distortion (vertical trapezoidal distortion, horizontal trapezoidal distortion, rotational distortion) of the image projected onto the screen 2100 can be adjusted. Therefore, according to the projector apparatus 1000, the distortion of the projected image can be easily adjusted without using the electronic control method.

  In the present embodiment, the vertical trapezoidal distortion is corrected without changing the position of the lower side of the outer peripheral outline frame line of the projected image on the screen 2100 by the rotation of the projector main body 100 around the first axis. The For this reason, in the present embodiment, since the projected light beam is projected at a large angle (projecting at a sharp angle with respect to the screen surface), a simple tilt change of the device is a large change in the projected image. It is more suitable when applied to a close-up projector. In the case of a general close-up projection projector, if the tilt of the projector body is changed to correct vertical trapezoidal distortion, for example, the lower side of the projection screen tends to change, and the upper side tends to change greatly. This is because such a change can be prevented in a close-projection projector to which is applied.

  In addition, at least vertical trapezoidal distortion correction and horizontal trapezoidal distortion and rotational distortion correction are independent adjustment items, so vertical trapezoidal distortion, horizontal trapezoidal distortion and rotational distortion are corrected independently ( Adjustment). Therefore, the present embodiment is effective when applied to a close-projection projector that is difficult to adjust.

  Further, in the correction of the projected image in the present embodiment, the keystone correction by electronic control is not performed, and the projector main body 100 including the projection lens unit 120, the reflection mirror 130, and the projection mirror 140 is moved by a predetermined amount to correct the image. Since the correction is performed, the correction can be performed without causing deterioration of the projected image.

  In the present embodiment, when the movement direction of the projector main body 100 is restricted by the shapes of the first groove 236, the second groove 238, and the third groove 242, that is, the arc-shaped or linear groove and the groove Although the case where the mechanism which combined the pin-shaped member fitted to is used was demonstrated, this invention is not limited to this. For example, a guide or the like for driving in a predetermined movement direction may be provided so that the projector main body 100 is moved around the first axis to the third axis.

  In the present embodiment, the projector main body 100 is included so as to be sandwiched between the upper housing 1100 and the lower housing 1200. However, the projector main body 100 is contained in one housing with an openable / closable lid on the upper surface or the lower surface. It may be included in.

  Further, in the above embodiment, the light beam from the projection lens unit 120 of the projector main body unit 100 may be directly projected on the screen 2100, or reflected by the projection mirror 140 without passing through the reflection mirror 130 and projected on the screen 2100. May be.

  In the present embodiment, the projection image correction method using the support mechanism 200 has been described with respect to correcting each of vertical trapezoidal distortion, horizontal trapezoidal distortion, and rotational distortion. It may be corrected. Also in this case, similarly to the above-described embodiment, similarly to the correction of the vertical trapezoidal distortion, the horizontal trapezoidal distortion, and the rotational distortion, the projector main body unit 100 is connected to the first axis, the second axis, and the third axis. What is necessary is just to turn around in order.

  Further, in the present embodiment, the support mechanism 200 supports the projector device 1000 so as to be rotatable around the three axes of the first, second, and third axes. Instead of the support mechanism 200, a support mechanism that supports the first axis and the second axis, or the first axis and the third axis so as to be rotatable about the two axes may be supported. It may be provided.

  As described above, the projector device of the present invention is suitable for correcting distortion of a projected image.

  DESCRIPTION OF SYMBOLS 100 ... Projector main-body part, 120 ... Projection lens part, 130 ... Reflection mirror, 140 ... Projection mirror, 220 ... Holding member, 230 ... 1st relay board, 240 ... 2nd relay board, 250 ... Installation stand, 1000 ... Projector apparatus 2100 ... screen.

Japanese Patent No. 3382045 JP 2008-083414 A

Claims (8)

A projector device that projects image light onto a screen by a projection optical system,
The foundation,
A projector main body having the projection optical system, rotatable with respect to the base portion around a first axis parallel to a line of intersection of the screen and a horizontal plane;
The projection optical system includes a reflective optical member that reflects the image light beam toward the screen,
The first axis at the upper end where the image light beam is incident on the reflective optical member from the middle point of the lower edge of the outer peripheral outline of the projected image on the screen by the rotation of the projector main body about the first axis The center point rotates around the first axis with the distance as a radius so that the distance to the center point in the direction can be kept constant, and the position in the height direction of the lower side of the outer peripheral outline line A projector device characterized in that a vertically and asymmetrical trapezoidal distortion of the projected image is corrected without changing the angle. The projector main body portion is further rotatable about a second axis parallel to the vertical axis with respect to the base portion,
By the second axis of rotation of the projector body portion, the distance to be able to maintain a constant, as a radius the length of the projection point of the center with respect to the horizontal plane of the distance around the second axis rotated, without changing the center line in the lateral direction of the front Kigai circumferential contour border, projector according to claim 1, asymmetric trapezoidal distortion in the vertical symmetry of the projected image, characterized in that it is corrected apparatus. The projector main body is rotatable about the third axis that projects a light beam directed from the projection optical system toward the midpoint of the lower edge of the outer peripheral outline of the projection image onto the horizontal plane with respect to the base.
By the third axis of rotation of the projector main body, the projector device according to claim 1, wherein the projected image, characterized in that it is rotated in the plane of the screen. The projector main body is rotatable about the third axis that projects a light beam directed from the projection optical system toward the midpoint of the lower edge of the outer peripheral outline of the projection image onto the horizontal plane with respect to the base.
By the third axis of rotation of the projector main body, the projector device according to claim 2, wherein the projected image, characterized in that it is rotated in the plane of the screen. The projector body has a zoom function capable of changing the size of the projected image,
By the zoom function, wherein when the conducted changes the size of the projected image even in the rotation of the first axis and the second axis of the projector main body, the center of the lower side of the outer contour frame line of the projection image The projector apparatus according to claim 4, wherein trapezoidal distortion of the projection image is corrected without changing a point.   6. The projector device according to claim 4, further comprising a support mechanism that supports the projector main body so as to be rotatable about three orthogonal axes of the first axis, the second axis, and the third axis with respect to the base part. . The support mechanism includes a first support member attached to the projector main body, a second support member mounted to be movable along an arc around the said second axis to said base portion, said second A third support member attached to the support member so as to be movable along an arc centered on the third axis and supporting the first support member so as to be movable along an arc centered on the first axis The projector device according to claim 6 having. In order to move each of the first, second, and third support members along the arc, a mechanism that combines an arc-shaped or linear groove and a pin-shaped member that fits into the groove is used. The projector device according to claim 7.

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