JP5741754B2 - Image projection device - Google Patents

Description

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

  In recent years, large-screen display devices have rapidly spread, and conferences, presentations, trainings, etc. using them have become common. There are various types of displays such as liquid crystal and plasma, and they are selected appropriately depending on the size of the place and the number of participants. Among them, projectors (hereinafter referred to as image projection devices) are relatively inexpensive and portable. It is the most widespread large screen display because it is excellent (ie, small and light and easy to carry).

  Against this backdrop, scenes and situations that require communication have increased more and more recently. For example, offices have many meeting spaces partitioned by small meeting rooms and partitions, and use image projection devices. Meetings and meetings have been held frequently. Along with this, even without a dedicated screen, many scenes are projected to be projected onto walls and whiteboards.

  In this way, when image projection apparatuses become widespread, a conventional general image projection apparatus requires a projection distance of several meters between a display medium such as a screen or a wall as a display medium, which is easy to use. Bad scenes are also increasing. Therefore, in order to eliminate such inconvenience, a so-called ultra-short focus type image projection apparatus capable of obtaining a large screen display at a very short projection distance has been put on the market.

  However, in such an ultra-short focus type image projection apparatus, if there is a slight error in the perpendicularity between the optical axis of the projection light and the projection surface, a large trapezoidal distortion occurs or the projection position is a desired position. There is a problem that comes off. Therefore, in order to solve such a problem, for example, by installing a plurality of projections from the image projection device and abutting them against the projection surface, the image projection device can be easily installed so that the image is not distorted. (See, for example, Patent Document 1).

  However, the technique disclosed in Patent Document 1 has no problem with a uniformly flat wall from the boundary with the ceiling to the boundary with the floor, for example, but becomes a problem in the case shown in FIG. . 1A and 1B are diagrams for explaining problems of a conventional image projection apparatus. FIG. 1A is a rear view, and FIG. 1B is a side view. In FIG. 1, reference numeral 100 denotes a whiteboard, 101 denotes an image projection apparatus disclosed in Patent Document 1, and 102 denotes an installation base. When an image is to be displayed on the whiteboard 100 due to the positional relationship between the whiteboard 100 and the image projection apparatus 101 in the form shown in FIG. 1, the protrusions 101 x coming out of the image projection apparatus 101 are below the whiteboard 100. Since the positional relationship is such that it penetrates the gap on the side, it cannot be abutted against the projection surface and cannot function.

This invention is made | formed in view of the above, and makes it a subject to provide the image projection apparatus with easy adjustment of the projection angle of a horizontal direction .

The image projection apparatus is an image projection apparatus that enlarges and projects an image on a projection surface, and a movable portion that adjusts a horizontal projection angle of the image with respect to the projection surface, and the movable portion moves. have a, an adjustment unit for adjusting the mobility of the movable part when you are, the adjustment unit, the movable portion, a first state in which it can continue to move the first force, the first of a second state in which it can force continue moving by greater than the second force, to be altered, the adjusting unit is a requirement Rukoto can maintain the first state of the movable portion.

According to the disclosed technology, it is possible to provide an image projection apparatus that can easily adjust the projection angle in the horizontal direction .

It is a figure for demonstrating the problem of the conventional image projector. It is a figure which illustrates the image projection apparatus which concerns on 1st Embodiment. It is a figure which shows roughly an example of the caster and brake mechanism of the image projector which concern on 1st Embodiment. It is a figure which illustrates the image projection apparatus which concerns on 2nd Embodiment. It is an example of the block diagram of the image projection apparatus which concerns on 2nd Embodiment. It is an example of the block diagram of the image projection apparatus which concerns on 3rd Embodiment. It is a figure which shows an example of the projection angle information displayed on a screen. It is a rear view which shows roughly an example of the caster and brake mechanism of the image projector which concern on 4th Embodiment. It is an example of the block diagram of the image projection apparatus which concerns on 4th Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

<First Embodiment>
2A and 2B are diagrams illustrating the image projection apparatus according to the first embodiment. FIG. 2A is a rear view, FIG. 2B is a side view, and FIG. 2C is a bottom view. . 2, for the sake of convenience, the major axis direction of the screen 90 is X, the normal direction is Y, and the minor axis direction is Z (the same applies to the following drawings). Further, for convenience, in the image projection apparatus 10, the surface facing the screen 90 is the front surface, the surface opposite to the front surface, the surface visible from the projection direction on the screen 90 is the back surface, and the surface facing the surface on which the image projection device 10 is placed. Is referred to as a side surface connecting the bottom surface, the front surface, the back surface, and the bottom surface (the same applies to the following drawings).

  Referring to FIGS. 2A to 2C, the image projection apparatus 10 includes, as main components, a main body 11, a projection unit including a projection mirror 12, a braking knob 13, and a main body support unit. 14 and a caster 15. For example, the image projection apparatus 10 is connected to an information device (not shown) such as a personal computer, converts an input image signal into projection light, and enlarges and projects it onto a projection surface such as a screen 90 or a wall. It has a function to display. The projection mirror 12 is a part of the projection unit and is particularly shown as an image for enlarging and displaying an image on a projection surface such as a screen 90 or a wall at a close distance.

  The main body 11 is supported by the main body support portion 14 and the casters 15. The caster 15 is attached to the inside of the main body 11, and a part of the caster 15 projects outward from the bottom surface of the main body 11 through the opening 11 x. The caster 15 is configured to be rotatable in the direction indicated by the arrow A, and is further configured to be rotatable in the direction indicated by the arrow B. Thereby, the image projection device 10 can be easily rotated in the direction indicated by the arrow C, and the horizontal projection angle of the image projection device 10 can be adjusted. The caster 15 is a typical example of the movable part according to the present invention.

  However, depending on the surface state of a mounting surface such as a table on which the image projection apparatus 10 is installed, the caster 15 may move too lightly, making it difficult to adjust the horizontal projection angle. In such a case, the projection angle in the horizontal direction can be easily adjusted by making the caster 15 difficult to move. Therefore, in the present embodiment, a brake mechanism that operates the braking knob 13 to apply appropriate braking to the caster 15 is provided inside the main body 11. In other words, the user can operate the brake knob 13 to apply appropriate braking to the caster 15 and adjust the horizontal projection angle by adjusting the force applied to the caster 15. The image projection apparatus 10 can be installed in a good state.

  3A and 3B are diagrams schematically illustrating an example of a caster and a brake mechanism of the image projection apparatus according to the first embodiment. FIG. 3A is a plan view of the caster, and FIG. 3B is a diagram of the caster. FIG. 3C is a side view of the caster and the brake mechanism. 3A to 3C, in the caster 15, a shaft 15b penetrating the support 15a is provided, two wheels 15c are attached to the respective wheels 15d, and the wheels 15d are shafts. 15b. Thereby, the wheel 15c can be rotated in the direction shown by the arrow A in FIG.

  One end of the column 15e is fixed at a predetermined position (not shown) inside the main body 11 of the image projection apparatus 10. The other end of the column 15e is received by a substantially hemispherical end surface 15f of the support 15a. Thereby, the direction of the caster 15 can be changed in the direction of arrow B in FIG.

  As described above, the caster 15 that is a movable portion is attached to the main body 11 of the image projection apparatus 10 in a rotatable state, and can be rotated in a plane parallel to the mounting surface on which the main body 11 is mounted. Can be rotated even in a plane perpendicular to the mounting surface on which is mounted. When the caster 15 which is a movable part rotates, the back side of the main body 11 rotates with respect to the front side of the main body 11 facing the projection surface such as the screen 90 (in the direction indicated by the arrow C in FIG. 2C). Rotate). Thereby, the horizontal projection angle of the image projection apparatus 10 can be adjusted.

  Next, the brake mechanism 20 will be described. The brake knob 13 is attached to the side surface of the main body 11 and can be operated by the user. The brake knob 13 controls the movement of the caster 15 via the brake mechanism 20.

  The brake mechanism 20 includes a screw portion 21, a spring portion 22, a transmission system 23, and a brake shoe 24. The brake knob 13 is directly connected to the screw portion 21, rotates integrally with the screw portion 21, and controls the force pushing the spring portion 22 connected to the tip. The force applied to the spring portion 22 is transmitted to the brake shoe 24 through the transmission system 23 connected to the tip of the spring portion 22, and the frictional force when the brake shoe 24 and the wheel 15 c come into contact with each other can be changed to improve the ease of movement of the caster 15. Be controlled. The brake shoe 24 is a typical example of the contact portion according to the present invention.

  That is, when the braking knob 13 and the screw portion 21 are integrally rotated to move the braking knob 13 in a direction approaching the main body 11, the force for pressing the spring portion 22 increases, and the brake shoe 24 and the wheel 15c Since the frictional force increases, the caster 15 becomes difficult to move. On the other hand, when the braking knob 13 and the screw portion 21 are integrally rotated and the braking knob 13 is moved away from the main body 11, the force pushing the spring portion 22 is reduced, and the brake shoe 24, the wheel 15c, Therefore, the caster 15 is easy to move. The brake mechanism 20 is a typical example of the movable part control means according to the present invention.

  As described above, the caster 15 rotates in the direction B in FIG. 2. However, if the size of the brake shoe 24 is large to some extent, the brake shoe 24 and the wheel even if the caster 15 rotates in the direction B in FIG. Since 15c contacts, the ease of movement of the caster 15 can be controlled. Further, it is more preferable if a mechanism that rotates the brake shoe 24 in the B direction together with the wheels 15c when the caster 15 rotates in the B direction in FIG. 2 is provided.

  As described above, according to the first embodiment, the caster 15 and the brake mechanism 20 that are movable parts are provided in the image projection apparatus 10, and the caster 15 can be easily moved via the brake mechanism 20 using the brake knob 13. I was able to control it. Therefore, the user can adjust the projection angle in the horizontal direction of the image projection apparatus 10 by adjusting the force according to his / her sense, and the usability of the image projection apparatus 10 can be improved.

<Second Embodiment>
FIG. 4 is a diagram illustrating an image projection apparatus according to the second embodiment. FIG. 4A is a plan view and FIG. 4B is a side view. Referring to FIG. 4, the image projection apparatus 30 is different from the image projection apparatus 10 (see FIG. 2) in that an imaging unit 31 and a display unit 32 are added. The imaging means 31 is arranged at a position where at least an area necessary for processing the display image of the main body 11 can be imaged, and takes a display image through the imaging opening 11y.

  The display part 32 is comprised by three LED (light emitting diode), for example. In the display unit 32, for example, when the horizontal projection angle is adjusted to such an extent that the user cannot recognize the distortion, the LED at the position “0” is lit, and when it enters a predetermined range close to the LED, Correspondingly, the LED at the position of “−” or “+” can be turned on. With regard to “−” and “+”, for example, “−” when the horizontal projection angle is shifted to the left side toward the screen 90, and “horizontal projection angle” is shifted to the right side. You can decide "+" or, of course, the opposite.

  FIG. 5 is an example of a block diagram of an image projection apparatus according to the second embodiment. In FIG. 5, an input image processing circuit 200 appropriately processes input image data input from an image source such as a personal computer according to the characteristics of the image projection device 30 and outputs it as display image data. As specific processing, for example, when the number of pixels that can be projected by the image projection device 30 is different from the number of pixels of the input image data, resolution conversion processing for matching them or data according to the color expression characteristics of the image projection device 30 is used. However, the present invention is not limited to these.

  In a normal use state, the display image data passes through the image switching circuit 201 at the next stage as it is and is transmitted to the image projection system 202 as projection image data. The image projection system 203 includes an image display panel (not shown), a projection unit such as a projection lens and a projection mirror 12, etc., and converts projection image data into projection light and projects it onto the screen 90.

  When it is desired to adjust the horizontal projection angle of the image projection apparatus 30, an adjustment start instruction signal is sent to the CPU 203 using an operation means such as a remote controller. Upon receiving the adjustment start instruction signal, the CPU 203 outputs an image switching instruction signal to the image switching circuit 201. The test image generation circuit 204 generates test image data for adjusting the horizontal projection angle and outputs the test image data to the image switching circuit 201. When receiving the image switching instruction signal from the CPU 203, the image switching circuit 201 switches the projection image data to the test image data. The test image generation circuit 204 is a typical example of test image generation means according to the present invention.

  For example, a CCD camera, a CMOS camera, or the like can be used as the imaging unit 31, and a display image of test image data is received and output as captured image data. The captured image processing circuit 205 grasps the outline of the display image from the input captured image data, and outputs horizontal projection angle data based on the result. The captured image processing circuit 205 can calculate, for example, the distortion of the external shape of the grasped display image, and convert the calculated distortion into horizontal projection angle data. At this time, a table, a conversion function, or the like that converts distortion into horizontal projection angle data can be used. The captured image processing circuit 205 is a representative example of captured image processing means according to the present invention. In the present embodiment, the projection angle detection unit is realized by the imaging unit 31 and the captured image processing circuit 205. However, the present invention is not limited to this, and other methods may be used.

  When the horizontal projection angle data is input, the CPU 203 outputs an LED drive signal to the LED drive circuit 206 based on the value, and the LED drive circuit 206 receives the LED drive signal 206 and drives the LED of the display unit 32. Outputs LED drive current. As a result, any LED of the display unit 32 is lit, and the user can easily know the direction in which the horizontal projection angle is shifted. The display unit 32 is a typical example of the projection angle information display unit according to the present invention.

  As described above, according to the second embodiment, since the horizontal projection angle of the image projection device 30 with respect to the screen 90 is detected and displayed on the display unit 32, the information displayed on the display unit 32 by the user is displayed. It is possible to adjust the horizontal projection angle of the image projection device 30 while watching, and the usability of the image projection device 30 can be further improved.

<Third Embodiment>
FIG. 6 is an example of a block diagram of an image projection apparatus according to the third embodiment. Referring to FIG. 6, the image projection apparatus according to the third embodiment (hereinafter referred to as image projection apparatus 40) does not have the LED drive circuit 206 and the display unit 32 unlike the image projection apparatus 30. . Instead, the image projection device 40 includes an OSD generation circuit 210 and an image composition circuit 211.

  The image projection device 40 has a function of displaying information such as brightness and contrast and displaying a so-called OSD menu on the screen 90 for guiding operations for adjusting the brightness and contrast. The horizontal projection angle information of the image projection device 40 is also included in the OSD menu and displayed on the screen 90.

  In the image projection apparatus 40, when receiving the horizontal projection angle data from the captured image processing circuit 205, the CPU 203 outputs a display instruction signal to the OSD generation circuit 210 and displays the current projection angle information on the screen 90. Instruct. The projection angle data in the horizontal direction is input to the OSD generation circuit 210 at the same time as being input to the CPU 203, and the OSD generation circuit 210 generates OSD data of the projection angle information in real time and outputs it to the image composition circuit 211. . The image composition circuit 211 synthesizes the selected image data and the OSD data and outputs them to the image projection system 202 as projection image data. The image projection system 203 converts the projection image data into projection light and projects it onto the screen 90.

  FIG. 7 is a diagram illustrating an example of projection angle information displayed on the screen. The projection angle information as shown in FIG. 7 is combined with the projection image and displayed on the screen 90 as a part of the OSD menu.

  Thus, according to the third embodiment, the horizontal projection angle of the image projection device 40 with respect to the screen 90 is detected and the projection angle information is displayed on the screen 90 as part of the OSD menu. However, it is possible to adjust the horizontal projection angle of the image projection device 40 while viewing the projection angle information displayed on the screen 90, and the usability of the image projection device 40 can be further improved.

<Fourth embodiment>
FIG. 8 is a rear view schematically showing an example of a caster and a brake mechanism of the image projection apparatus according to the fourth embodiment. Referring to FIG. 8, the image projection apparatus according to the fourth embodiment (hereinafter referred to as image projection apparatus 50) does not have the braking knob 13 like the image projection apparatus 10 or the like. Instead, the image projection device 50 includes a first gear 25, a second gear 26, a rotating shaft 27, and a motor 28. That is, the image projection device 50 is configured to perform brake control with a drive system including the first gear 25, the second gear 26, the rotating shaft 27, and the motor 28 instead of the braking knob 13.

  3 is concentrically attached to the first gear 25 and is driven by the first gear 25 in the same manner as the adjustment knob 13. The first gear 25 is meshed with a second gear 26 attached to the rotating shaft 27 of the motor 28, and the driving force from the motor 28 is transmitted via the second gear 26 to rotate. it can. As the motor 28, a DC motor, a pulse motor, or the like can be used.

  FIG. 9 is an example of a block diagram of an image projection apparatus according to the fourth embodiment. Referring to FIG. 9, the image projection device 50 does not have the LED drive circuit 206 and the display unit 32 unlike the image projection device 30. Instead, the image projection device 50 includes a motor drive circuit 220. In FIG. 9, when the CPU 203 receives horizontal projection angle data from the captured image processing circuit 205, it generates a motor drive signal based on the value and outputs it to the motor drive circuit 220. The motor drive circuit 220 outputs a motor drive current to the motor 28 based on the motor drive signal input from the CPU 203.

  For example, if the motor 28 is a DC motor, the output time of the motor drive current is controlled so that an appropriate braking force is applied to the wheels. If the motor 28 is a pulse motor, the number of pulses output to the motor 28 is controlled. Is done. In a range where the deviation of the horizontal projection angle is large, the braking force can be reduced so that the horizontal projection angle can be moved greatly. As the deviation of the horizontal projection angle becomes smaller, the braking force can be increased to make fine movements. Thus, it is preferable to perform control so that the braking force is maximized and maintained in a region where distortion is not recognized.

  As described above, according to the fourth embodiment, the optimum braking load corresponding to the projection angle in the horizontal direction of the image projection apparatus 50 with respect to the screen 90 is automatically applied to the caster 15 serving as the movable portion. The projection angle in the horizontal direction can be easily adjusted, and the usability of the image projection apparatus 50 can be further improved.

  The preferred embodiment has been described in detail above. However, the present invention is not limited to the above-described embodiment, and various modifications and replacements are made to the above-described embodiment without departing from the scope described in the claims. Can be added.

  For example, the fourth embodiment may be combined with the second embodiment or the third embodiment.

DESCRIPTION OF SYMBOLS 10, 30 Image projection apparatus 11 Main body 11x Opening part 11y Imaging opening part 12 Projection mirror 13 Braking knob 14 Main body support part 15 Caster 15a Support body 15b Shaft 15c Wheel 15d Wheel 15f End face 20 Brake machine 21 Screw part 22 Spring part 23 Transmission system 24 Brake shoe 25 First gear 26 Second gear 27 Rotating shaft 28 Motor 31 Imaging means 32 Display unit 90 Screen 200 Input image processing circuit 201 Image switching circuit 202 Image projection system 203 CPU
204 Test Image Generation Circuit 205 Captured Image Processing Circuit 206 LED Drive Circuit 210 OSD Generation Circuit 211 Image Composition Circuit 220 Motor Drive Circuit

JP 2009-251204 A

Claims (5)

An image projection apparatus that projects an enlarged image onto a projection surface,
A movable part that adjusts a horizontal projection angle of the image with respect to the projection surface;
Have a, an adjustment unit for adjusting the mobility of the movable portion when the movable portion is moving,
In the first state in which the adjustment unit can continue to move the movable unit by a first force and in the second state in which the second unit can continue to be moved by a second force larger than the first force. Can be changed,
The adjustment unit, the image projection apparatus according to claim Rukoto can maintain the first state of the movable portion. An image projection apparatus that projects an enlarged image onto a projection surface,
A movable part that adjusts a horizontal projection angle of the image with respect to the projection surface;
Have a, an adjustment unit for adjusting the mobility of the movable portion when the movable portion is moving,
The adjustment unit includes a rotation unit, and the rotation unit rotates in a predetermined direction so that a frictional force applied to the movable unit increases . An image projection apparatus that projects an enlarged image onto a projection surface,
A movable part that adjusts a horizontal projection angle of the image with respect to the projection surface;
Have a, an adjustment unit for adjusting the mobility of the movable portion when the movable portion is moving,
The adjusting unit includes a rotating unit, the rotating unit rotates in a predetermined direction, and the frictional force applied to the movable unit increases,
By increasing the frictional force, the movable part can be continuously moved by a second force larger than the first force from the first state where the movable part can be continuously moved by the first force. An image projection apparatus characterized by being changed to a second state . An image projection apparatus that projects an enlarged image onto a projection surface,
  A movable part that adjusts a horizontal projection angle of the image with respect to the projection surface;
  A rotatable rotating part,
  An image projection apparatus characterized in that when the rotating part rotates, a predetermined frictional force is applied to the movable part, whereby the movement of the movable part when the movable part is moving is controlled. When the rotating part is in a predetermined state, a first frictional force is applied to the movable part, and when the rotating part is rotated by a certain amount of rotation from the predetermined state, the movable part is subjected to the first frictional force. The image projection apparatus according to claim 4, wherein the movement of the movable portion is controlled by applying a large second frictional force.

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