JP2018013652A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device capable of accurately correcting an optical axis deviation occurring along with a lens movement under any environment.SOLUTION: A projection display device includes: a lens unit having one or more lenses movable in an optical axis direction; lens position detection means for detecting a position of a lens; and image movement means capable of move a projection position of a projection image. The projection display device further includes optical axis deviation correction amount storage means configured to store the position of the lens and each optical axis deviation correction amount. When a lens is moved, the image movement means is moved from the lens position detection means and the optical axis deviation correction amount storage means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection display device, and more particularly to drive control of a lens device.

  In recent years, in order to reduce the installation distance from the screen, projection display devices that reflect an image using a free-form surface mirror are increasing.

  In recent years, projection mapping has been actively performed. In projection mapping, an image expression method for enlarging and reducing an image using a lens device (projection lens) during projection is also conceivable.

  In the lens apparatus, tilt, parallel eccentricity, and the like occur in each lens due to tolerances and the like. Therefore, when the internal lens moves in the front-rear direction of the optical axis due to focusing or zooming, the optical axis of the lens device fluctuates slightly. For example, in a projection display device, the center position (optical axis) of a projected image varies minutely due to zooming or focusing. However, these phenomena may not be acceptable.

  In a projection display device using a free-form surface mirror, the position sensitivity between the optical axis center of the lens device (projection lens) and the reflection mirror is high, and the optical performance of the upper peripheral portion of the image is particularly high when the relative positional relationship is shifted. Often, the deterioration of the

  Projection mapping usually improves the brightness by superimposing projection images from multiple projection display devices. However, if the direction and amount of variation differ for each lens device (projection lens), the images combined in units of pixels at the time of installation Shifts to cause image degradation. Further, when the projection display device is used alone, it is visually recognized as a phenomenon that the image shakes.

  Therefore, there is a demand for a technique for correcting the change of the optical axis (change in the position of the projected image) when the lens is moved by zooming or focusing.

  Patent Document 1 proposes to detect relative position information between a screen and a projection display device and operate a shift mechanism, a zoom mechanism, a focus mechanism, and a device tilt adjustment mechanism based on the results to bring the projected image closer to the effective area of the screen. Is disclosed.

  Patent Document 2 discloses a proposal for predicting a screen position based on information from an imaging unit and matching a projected image with a screen.

Japanese Patent Laid-Open No. 2004-341029 JP 2006-313979 A

  However, in the conventional technique disclosed in the above-described patent document, when imaging information is fed back, adjustment is performed after the projection image fluctuates, and thus the fluctuation itself during projection cannot be eliminated. Further, when the projection target is uneven or has no screen frame, it is difficult to accurately detect the position information.

  Furthermore, if the relationship between the optical axis and the free-form surface mirror deviates from the image projected through the free-form surface mirror, the degree of deterioration is not constant depending on the direction and amount of deviation. Is difficult to predict accurately. In addition, since the distance to the screen is short, the degree of influence on the correction amount caused by the measurement error of the position information becomes large and correction is difficult.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens apparatus capable of accurately correcting an optical axis shift caused by the movement of the lens under any environment.

In order to achieve the above object, a projection display device according to the present invention provides:
A lens unit having one or more lenses movable in the optical axis direction;
Lens position detecting means for detecting the position of the lens;
In the projection display device having the image moving means capable of moving the projection position of the projection image,
An optical axis deviation correction amount storage means for recording the lens position and the optical axis deviation correction amount at that time;
When the lens is moved, from the lens position detection means and the optical axis deviation correction amount storage means,
The image moving means is moved.

  According to the present invention, it is possible to provide a lens device capable of accurately correcting an optical axis shift that occurs with the movement of the lens under any environment.

The flowchart which showed the control flow of the 1st Embodiment of this invention Schematic diagram of a projection display device explaining the present invention Unit external view of projection lens for explaining the present invention Sectional view of projection lens illustrating the present invention Unit schematic diagram of shift mechanism illustrating the present invention Unit diagram of image generation means (liquid crystal panel) for explaining the present invention The figure which shows the image generation area | region of the image generation means explaining this invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a flowchart showing a control flow according to an embodiment of the present invention. FIG. 2 is a schematic view of a projection display device illustrating the present invention.

  Reference numeral 1 denotes a projection lens for enlarging and reducing the generated image. A lens shift mechanism 2 holds the projection lens 1 and can move to a plane perpendicular to the optical axis of the projection lens. 4 is a liquid crystal panel as an image generating device for generating an arbitrary image. Reference numeral 3 denotes a color separation / synthesis optical system for separating light from a light source into three colors of red, blue, and green, and synthesizing images of three colors of red, blue, and green generated by the liquid crystal panel 4. An illumination optical system 5 uniformly irradiates the liquid crystal panel 4 with light from the light source. 8 is a screen for projecting an image. 6 is a light source for generating light. A projection display device exterior housing 7 stores therein the projection lens 1, the shift mechanism 2, the color separation / synthesis optical system 3, the liquid crystal panel 4, the illumination optical system 5, and the light source lamp 6.

  FIG. 3 is a unit external view of the projection lens for explaining the present invention. FIG. 4 is a cross-sectional view of the projection lens for explaining the present invention, and shows the AA cross section of FIG.

  Reference numeral 15 denotes a focus cam ring which can move a focus group by a predetermined amount in the optical axis direction by rotating. When the focus ring 12 is rotated using a motor, the focus cam ring 15 is also rotated. Reference numeral 11 denotes a focus position detection sensor for detecting the position of the focus group. Reference numeral 16 denotes a zoom cam ring that rotates to move the zoom group by a predetermined amount in the optical axis direction. When the zoom ring 13 is rotated using a motor, the zoom cam ring 16 is also rotated. Reference numeral 14 denotes a zoom position detection sensor for detecting the position of the zoom group. Reference numeral 17 denotes an IS drive group which is arranged in the projection lens 1 and can move the optical axis of the projection lens 1 by moving in the arrow direction in FIG. By moving the IS drive group 17, the projected image can be moved to a plane perpendicular to the optical axis of the projection lens.

  FIG. 5 is a unit schematic diagram of the shift mechanism for explaining the present invention.

  Reference numeral 26 denotes a lateral drive plate that holds the projection lens 1 and moves the projection lens 1 in the drawing X direction (lateral direction in the drawing) perpendicular to the optical axis of the projection lens. The lateral drive plate 26 is connected to the lateral drive mechanism 24. A movement amount detection sensor capable of detecting the movement amount is built in the lateral drive mechanism 24. The lateral drive mechanism 24 is connected to a lateral drive gear 23 that transmits a driving force from a motor (not shown). Reference numeral 25 denotes a vertical drive plate that holds the horizontal drive plate 26 and moves it in the Y direction in the drawing (vertical direction in the drawing) perpendicular to the optical axis of the projection lens. The longitudinal drive plate 25 is connected to the longitudinal drive mechanism 22. A movement amount detection sensor capable of detecting the movement amount is built in the vertical driving mechanism 22. The vertical driving mechanism 22 is connected to a horizontal driving gear 21 that transmits a driving force from a motor (not shown).

  FIG. 6 is a unit diagram of image generation means (liquid crystal panel 4) for explaining the present invention. FIG. 7 is a diagram showing an image generation area of the image generation means (liquid crystal panel 4) for explaining the present invention.

  Reference numeral 42 denotes an image generation possible area which is an area where light can be irradiated and an arbitrary image can be generated. Reference numeral 41 denotes an image generation area that exists in the image generation possible area 42 and generates a projection image. The image generation area 41 is movable as long as it is within the image generation possible area 42 (see FIGS. 711 and 412). Reference numerals 411 and 412 denote different image generation areas in the image generation possible area 42. By moving the image generation area 41, the projected image can be moved in a unit of one pixel of the liquid crystal panel 4 to a plane perpendicular to the optical axis of the projection lens.

  The projection display device has three shift means. The first is a shift mechanism 2 that holds the projection lens 1 and is movable in the direction perpendicular to the optical axis, and the second is located in the projection lens 1 and moves in the direction of the arrow in FIG. Fluctuating IS group 17. The third is a digital shift in which the projected image is moved in units of one pixel by moving the image generation area (see FIG. 7) in the image generation possible area 42 in the liquid crystal panel 4.

  The optical axis correction flow of the projection lens according to the first embodiment of the present invention will be described below with reference to FIGS.

  In the lens apparatus, the optical axis fluctuates slightly when an internal lens (moving group) moves by focusing or zooming. Since the fluctuation amount and the fluctuation direction are caused by component tolerance, assembly, adjustment, and the like, each lens apparatus has a different tendency. The same applies to the projection lens 1 which is a lens device in the projection display device.

  Therefore, the deviation of the optical axis is recorded for each projection lens 1 at the time of manufacture, and information on the position of the lens (moving group) and the deviation of the optical axis is stored in a storage device (not shown). Here, the position of the lens (moving group) has the same meaning as the focus position and the zoom position.

  First, at step 1, the user performs at least one of a focus operation and a zoom operation.

  Next, at step 2, focus position information and zoom position information are read via the focus position detection sensor 11 and the zoom position detection sensor.

  Next, at step 3, the correction amount for correcting the optical axis deviation amount generated by focusing or zooming is selected with reference to the optical axis deviation correction amount information stored at the time of manufacture.

  Next, in step 4, the correction amount selected in step 3 for the optical axis deviation generated by focusing or zooming is reduced by moving the projection lens 1 using the shift mechanism 2.

  In the case where the shift mechanism 2 is a projection display device that can specify movement to a predetermined position in the vertical and horizontal directions, it is preferable to reset the predetermined position at the same time as the shift mechanism 2 is moved by the above correction. Here, the predetermined position is indicated by product specifications, for example, “shift up / down / left / right 0%”, “shift up 60%”, “shift down 10%”, “shift left / right 10%”. Rather, it is set to a predetermined position where the movement amount is restricted by software.

  The predetermined position regulated by the software of the shift mechanism 2 is set inside with a margin with respect to the physically colliding end. That is, (soft end position) + (room margin) = (physically colliding end). That is, the shift range of the shift mechanism 2 can be changed as long as the amount of movement by the correction does not exceed the margin.

  When the movement amount by the correction exceeds the margin, the shift movable range is expanded using two means. The first is a digital shift that changes the position of the image generation area 41 in the image generation possible area 42 of the liquid crystal panel 4. The second is an IS shift operation in which the IS group 17 is driven to shift an image in an initial state (a state where no vibration is input to the projection display device).

  The shift range of the projected image is changed in the optical axis shift correction direction by the optical axis shift correction amount.

  Next, at step 5, it is determined whether there is a command to turn off the power of the projection display device. If not, return to step 1 and repeat step 1 to step 5 until there is a command to turn off the power of the projection display device.

  If there is a command to turn off the power of the projection display device, the operation is terminated.

  The optical axis correction flow of the projection lens according to the second embodiment of the present invention will be described below with reference to FIGS.

  The optical axis deviation is recorded for each projection lens 1 at the time of manufacture, and information on the position of the lens (moving group) and the optical axis deviation is stored in a storage device (not shown).

  First, at step 1, the user performs at least one of a focus operation and a zoom operation.

  Next, at step 2, focus position information and zoom position information are read via the focus position detection sensor 11 and the zoom position detection sensor.

  Next, at step 3, the correction amount for correcting the optical axis deviation amount generated by focusing or zooming is selected with reference to the optical axis deviation correction amount information stored at the time of manufacture.

  Next, in step 4, the liquid crystal panel 4 is used to reduce the correction amount selected in step 3 for the optical axis deviation generated by focusing or zooming. Specifically, the projected image is moved by changing the image generation area within the image generation possible area 42.

  When the shift mechanism 2 is a projection display device that can designate movement to a predetermined position in the vertical and horizontal directions, it is preferable to reset the predetermined position simultaneously with the above correction. Here, the predetermined position is indicated by product specifications, for example, “shift up / down / left / right 0%”, “shift up 60%”, “shift down 10%”, “shift left / right 10%”. Rather, it is set to a predetermined position where the movement amount is restricted by software.

  The predetermined position regulated by the software of the shift mechanism 2 is set inside with a margin with respect to the physically colliding end. That is, (soft end position) + (room margin) = (physically colliding end). That is, the shift range of the shift mechanism 2 can be changed as long as the amount of movement by the correction does not exceed the margin.

When the movement amount by the correction exceeds the margin, the shift movable range is expanded using two means. The first is a digital shift that changes the position of the image generation area 41 in the image generation possible area 42 of the liquid crystal panel 4. The second is an IS shift operation in which the IS group 17 is driven to shift an image in an initial state (a state where no vibration is input to the projection display device).
The shift range of the projected image is changed in the optical axis shift correction direction by the optical axis shift correction amount.

  Next, at step 5, it is determined whether there is a command to turn off the power of the projection display device. If not, return to step 1 and repeat step 1 to step 5 until there is a command to turn off the power of the projection display device.

  If there is a command to turn off the power of the projection display device, the operation is terminated.

  The optical axis correction flow of the projection lens according to the third embodiment of the present invention will be described below with reference to FIGS.

  The optical axis deviation is recorded for each projection lens 1 at the time of manufacture, and information on the position of the lens (moving group) and the optical axis deviation is stored in a storage device (not shown).

  First, at step 1, the user performs at least one of a focus operation and a zoom operation.

  Next, at step 2, focus position information and zoom position information are read via the focus position detection sensor 11 and the zoom position detection sensor.

  Next, at step 3, the correction amount for correcting the optical axis deviation amount generated by focusing or zooming is selected with reference to the optical axis deviation correction amount information stored at the time of manufacture.

  Next, at step 4, the IS group 17 is used to reduce the correction amount selected at step 3 for the optical axis deviation generated by focusing or zooming. Specifically, the IS group 17 is driven and the projected image is moved by shifting the image in an initial state (a state where no vibration is input to the projection display device).

  When the shift mechanism 2 is a projection display device that can designate movement to a predetermined position in the vertical and horizontal directions, it is preferable to reset the predetermined position simultaneously with the above correction. Here, the predetermined position is indicated by product specifications, for example, “shift up / down / left / right 0%”, “shift up 60%”, “shift down 10%”, “shift left / right 10%”. Rather, it is set to a predetermined position where the movement amount is restricted by software.

  The predetermined position regulated by the software of the shift mechanism 2 is set inside with a margin with respect to the physically colliding end. That is, (soft end position) + (room margin) = (physically colliding end). That is, the shift range of the shift mechanism 2 can be changed as long as the amount of movement by the correction does not exceed the margin.

When the movement amount by the correction exceeds the margin, the shift movable range is expanded using two means. The first is a digital shift that changes the position of the image generation area 41 in the image generation possible area 42 of the liquid crystal panel 4. The second is an IS shift operation in which the IS group 17 is driven to shift an image in an initial state (a state where no vibration is input to the projection display device).
The shift range of the projected image is changed in the optical axis shift correction direction by the optical axis shift correction amount.

  Next, at step 5, it is determined whether there is a command to turn off the power of the projection display device. If not, return to step 1 and repeat step 1 to step 5 until there is a command to turn off the power of the projection display device.

  If there is a command to turn off the power of the projection display device, the operation is terminated.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. For example, it stores the amount of optical axis misalignment in the projection lens attitude for each projection display device installation method (when suspended from the ceiling, installed on a desk, projected upward, etc.) It is also possible to finely correct the difference in the optical axis variation due to the attitude difference of 1. In addition, the liquid crystal panel has been described as the image generation unit, but the same effect can be obtained with an image generation unit such as DMD.
Further, the optical axis correction may be performed by combining the three correction means of the shift mechanism, the liquid crystal panel, and the IS group of the first, second, and third embodiments.

1 projection lens, 11 focus position detection sensor, 12 focus ring,
13 Zoom ring, 14 Zoom position detection sensor, 15 Focus cam ring,
16 zoom cam ring, 17 IS group, 2 shift mechanism, 21 height direction drive gear,
22 height direction drive mechanism, 23 lateral direction drive gear, 24 lateral direction drive mechanism,
25 vertical direction drive plate, 26 horizontal direction drive plate, 3 color separation / synthesis optical system, 4 liquid crystal panel,
41 image generation area, 42 image generation possible area, 411 image generation area 1
412 Image generation area 2, 5 Illumination optical system, 6 Light source lamp,
7 Projection display exterior housing, 8 screens

Claims (5)

A lens unit having one or more lenses movable in the optical axis direction;
Lens position detecting means for detecting the position of the lens;
In the projection display device having the image moving means capable of moving the projection position of the projection image,
An optical axis deviation correction amount storage means for recording the lens position and the optical axis deviation correction amount at that time;
When the lens is moved, from the lens position detection means and the optical axis deviation correction amount storage means,
A projection display device that moves the image moving means. The projection display device according to claim 1, wherein the image moving unit is configured by a lens shift mechanism that holds the lens unit and allows the lens unit to move in a plane parallel to an optical axis. 2. The projection display device according to claim 1, wherein the image moving means is constituted by a digital shift means for moving an image generation region of an optical modulation element that forms an optical image corresponding to a video signal. The projection display device according to claim 1, wherein the image moving unit is disposed in the lens unit, and is configured by a vibration isolation mechanism for correcting image misalignment. After moving the image moving means to reduce the amount of optical axis deviation before and after the movement of the lens,
The projection display apparatus according to claim 1, wherein the moving range of the image moving unit is reset.