WO2017054113A1

WO2017054113A1 - Projection system with bidirectional offset axis

Info

Publication number: WO2017054113A1
Application number: PCT/CN2015/090972
Authority: WO
Inventors: 那庆林; 黄彦; 麦浩晃; 陈理军
Original assignee: 神画科技（深圳）有限公司
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2017-04-06

Abstract

A projection system with a bidirectional offset axis. With an object surface (202) of a projection lens of a projection system as an object surface plane, and with an intersection point (O₁) of an optical axis of the projection lens and the object surface plane as an original point, the object surface plane is divided into four quadrants. An offset axis of an effect display unit (204) of a projection display device in the projection system is set to be greater than 70 percent in the horizontal direction, and greater than 70 percent in the vertical direction as well. Preferably, the offset axis in the horizontal direction and the vertical direction can both be greater than or equal to 100 percent; that is, the effect display unit is set to be located in only one of the quadrants in the object surface plane. In this case, even though such a projection system is placed at a corner position, a projection image (214) still can be adjusted to achieve the best viewing effect for the human eye.

Description

Projection system with bidirectional off-axis

Technical field

This invention relates to projectors and, more particularly, to a projection system having a bidirectional off-axis.

Background technique

As shown in FIG. 1A, in the projection lens unit of the projector, if the center of the effective display unit 104 is located on the optical axis of the lens, it belongs to the case of unbiased projection. It can be understood that if such a projector is placed directly on the desktop, the lower part of the projected beam will be blocked by the desktop and cannot be completely ejected, so it is necessary to perform off-axis projection in the vertical direction for the installation position (also called Treated as Offset).

As shown in FIG. 1B, this is a schematic diagram of the lower off-axis projection, in which case the effective display unit 104 is located at the upper portion of the lens optical axis and is on the lens projection object plane. The positional relationship after projection is as shown in Fig. 2B, and the position after imaging is just reversed, which is located at the lower part of the optical axis of the lens. When the projector is mounted on the roof, the projected image is always below the roof and is not obscured by the roof.

As shown in FIG. 1C, this is a schematic diagram of the upper off-axis projection, in which case the effective display unit 104 is located at the lower portion of the optical axis of the lens and on the object surface of the lens projection. Its imaged position is exactly the reverse, located at the top of the lens's optical axis. When you place this projector on a table, the projected image is always above the desktop and is not obscured by the desktop.

2A is a schematic diagram showing the positional relationship of the unbiased projection, corresponding to the effect shown in FIG. 1A; wherein the display chip working surface is the object plane 202 of the projection system, and the projection plane is the image plane 216 of the projection system. The projection lens optical axis center 212 passes through the center 210 of the projection lens 208 and is perpendicular to the object plane 202 and the image plane 216, and intersects the points O1 and O2, respectively. Taking the O1 point as the origin, a coordinate plane is formed on the object surface 202, and four quadrants are divided; a coordinate plane is formed on the image plane 216 with the O2 point as the origin, and four quadrants are divided. The effective display unit 204 is uniformly located within the four quadrants of the object plane 202, is imaged on the image plane 216 by a projection lens, and the projected image 214 is uniformly located within the four quadrants of the image plane.

FIG. 2B is a schematic diagram showing the positional relationship of the uniaxial off-axis projection, corresponding to the lower off-axis shown in FIG. 1B. a projection effect; wherein the effective display unit 204 is uniformly located in the first and second quadrants of the object surface 202, and after being imaged on the image plane 216 by the projection lens, the projection image 214 is uniformly located in the third and fourth portions of the image plane 216. Within the quadrant.

The aforementioned off-axis projection is only a single direction of processing. If the above-mentioned unbiased projection projector is placed on the table and its right side is against the wall, the lower part of the projected beam will be blocked by the tabletop and cannot be completely ejected. On the other hand, the right part of the projected beam will be blocked by the wall and cannot be completely ejected. If the above-mentioned projector with the upper off-axis projection is placed on the table and its right side is against the wall, the projected beam will not be blocked by the tabletop, but will still be blocked by the wall surface and cannot be completely ejected.

It can be seen that when the projector with the upper off-axis projection and the projector with the lower off-axis projection are mounted on the wall position, a part of the projected light beam is blocked by the wall surface of the side surface, and a complete image cannot be projected.

Summary of the invention

In view of the above-mentioned drawbacks of the prior art, the present invention solves the problem that a part of the beam projected by the conventional one-way off-axis projection system is always blocked by the wall surface of the side, and the complete image cannot be projected.

In order to solve the above technical problem, the present invention provides a projection system having a bidirectional off-axis, wherein, in the projection system, the object plane of the projection lens is a plane plane, and the optical axis of the projection lens An intersection with the plane of the object plane is an origin, and the plane of the object plane is divided into four quadrants, and an effective display unit of the projection display device in the projection system is set to have an off-axis of more than 70% in the horizontal direction. The off-axis in the vertical direction is also greater than 70%.

The projection system of the present invention may further include a first adjustment unit for adjusting an off-axis of the effective display unit in a horizontal direction, and/or a second for adjusting an off-axis of the effective display unit in a vertical direction Adjustment unit. In the first adjusting unit and/or the second adjusting unit, the off-axis of the effective display unit in the horizontal and/or vertical direction is adjusted by adjusting the relative position of the effective display unit and the projection lens in the projection system.

In the projection system of the present invention, the effective display unit may be set such that the off-axis in the horizontal direction is greater than or equal to 100%, and the off-axis in the vertical direction is also greater than or equal to 100%, that is, the effective display unit is set to Only in one of the quadrants of the object plane, specifically in the first, second, Any of the third and fourth quadrants.

The projection system of the present invention further includes a third adjustment unit for adjusting an off-axis of the effective display unit in the horizontal direction to switch between the first quadrant and the second quadrant, or between the third or fourth quadrant And/or a fourth adjustment unit for adjusting an off-axis of the effective display unit in the vertical direction to switch between the first quadrant and the fourth quadrant, or between the second or third quadrant. In the third adjusting unit and/or the fourth adjusting unit, the off-axis of the effective display unit in the horizontal and/or vertical direction may be adjusted by adjusting the relative position of the effective display unit and the projection lens in the projection system. .

In the projection system of the present invention, the projection lens is a fixed focus lens or a zoom lens.

In the projection system of the present invention, the projection lens is a zoom lens, and further includes a focusing unit that performs automatic focusing processing on the projection lens.

By adopting the projection system with bidirectional off-axis of the invention, the off-axis projection can be realized in two directions, and when the bidirectional 100% off-axis is set, the projection image can be further located in the first, second, third, and In any quadrant of the four quadrants, for example, when placing it on a tabletop and leaning against the wall on the right side, on the one hand, the lower part of the projected beam is not blocked by the tabletop due to the upper off-axis. Due to the left off-axis, the right part of the projected beam is not blocked by the wall, that is, the projected beam can be completely emitted. Even if this projection system is placed in a corner position, the projected image can be adjusted to the best viewing of the human eye.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Figure 1A is a schematic illustration of an unbiased projection system;

Figure 1B is a schematic view of a lower off-axis projection system;

Figure 1C is a schematic illustration of an upper off-axis projection system;

1D is a schematic diagram of a right and upper bidirectional partial off-axis projection system;

Figure 1E is a schematic diagram of a right and upper bidirectional 100% off-axis projection system;

2A is a schematic view showing the positional relationship between the object surface, the image plane, and the optical axis center in the unbiased projection system;

2B is a schematic view showing the positional relationship between the object surface, the image plane, and the optical axis center in the lower off-axis projection system;

2C is a schematic view showing the positional relationship between the object surface, the image plane, and the optical axis center in the bidirectional off-axis projection system;

Figure 3 is a schematic view of the bidirectional off-axis projector placed on the right side of the viewer;

Figure 4 is a schematic view of the bidirectional off-axis projector placed on the left side of the viewer;

Figure 5A is a schematic view of the off-axis position adjustment;

Fig. 5B is a schematic view of the off-axis position adjustment.

detailed description

As shown in FIG. 1D, this is a schematic diagram of the bidirectional partial off-axis projection system. At this time, the effective display unit 104 is 80% to the left and the bottom in the figure, and the position after the projection imaging is exactly the reverse. Right and upper off-axis. Regarding the definition of the off-axis ratio, the vertical direction in FIG. 1D is taken as an example. On the lens projection surface, the distance from the center of the effective display unit 104 to the horizontal line passing through the optical axis is h1, and the center of the effective display unit is The distance of the effective display unit edge of the horizontal line of the optical axis is h2, and the ratio of h1/h2 is the off-axis ratio in the present invention. In specific implementation, the off-axis in any of the upper, lower, left, and right directions is preferably greater than 70%, and then combined in pairs. For example, when the upward off-axis is greater than 100% and the off-axis is greater than 70% to the left, it may be suitable to be placed on the table against the wall on the right side.

As shown in FIG. 1E, this is a schematic diagram of bidirectional off-axis projection of the upper off-axis plus right off-axis mode, in which case the effective display unit 104 is located at the lower left portion of the lens object plane. At this time, the off-axis of the effective display unit 104 to the left and the downward is greater than 100%.

2C is a schematic diagram of a bidirectional off-axis projection system, in which the object plane of the projection lens in the projection system is the object plane, the intersection of the optical axis of the projection lens and the object plane is taken as the origin, and the object plane is divided into four. In the quadrant, the effective display unit 204 of the projection display device in the projection system is disposed completely within the first quadrant of the object plane 202, imaged on the image plane 216 by the projection lens, and the projected image 214 is entirely at the third of the image plane 216 Within the quadrant. That is to say, there are both the lower off axis and the left off axis, so the projected image will be at the lower left.

In a specific implementation, the mode may be the upper off-axis plus the right off-axis, the projected image 214 is completely located in the first quadrant of the image plane 216; or the upper off-axis plus the left off-axis mode, and the projected image 214 is completely located on the image plane. Within the second quadrant of 216; or a mode of lower off-axis plus right off-axis, the projected image 214 is entirely within the fourth quadrant of image plane 216.

For example, the above-mentioned off-axis plus left-off axis mode is used to place the bi-directional off-axis projection projector on the desktop. When the upper side is against the wall, on the one hand, because of the upper off-axis, the lower part of the beam that is projected is not blocked by the table top. On the other hand, because of the left off-axis, the right part of the projected beam is not It will be blocked by the wall, that is, the projected beam can be completely emitted.

As shown in FIG. 3, the projector 302 with bidirectional off-axis is placed on the bedside cabinet on the right side of the viewer. At this time, there are wall surfaces on the rear side and the right side, so it is necessary to select the mode of the lower off-axis and the left off-axis, and project the image. The 304 can be projected onto the ceiling, and the person can lie in the bed to view the projected picture. Since the amount of off-axis in both directions of the projector is greater than 102%, the projected image can be projected at the best viewing position of the human eye, and the image is not generated. The trapezoidal distortion is not blocked by the wall and is very convenient to use. It is not necessary to find a special bracket to fix the projector.

As shown in FIG. 4, the projector 302 can also be placed on the left side of the bedside cabinet. At this time, there are wall surfaces on the rear side and the left side. Therefore, it is necessary to select the mode of the lower off-axis and the right off-axis, so only the projection is required. The off-axis of the horizontal direction of the machine is adjusted to the reverse position to achieve the normal projection effect.

Wherein, an adjustment unit may be provided, the off-axis of the effective display unit in the horizontal direction may be adjusted, or the off-axis of the effective display unit in the vertical direction may be adjusted, and the adjustment unit in two directions may be set at the same time, or only one direction may be set Adjustment unit. For example, for a projection system that is fixedly set to the upper off-axis mode, only the off-axis adjustment unit in the horizontal direction can be set. Specifically, the off-axis of the effective display unit in the horizontal and/or vertical direction can be adjusted by adjusting the relative position of the effective display unit and the projection lens in the projection system.

In addition, for the case of more than 100% bidirectional off-axis, the function of the horizontal direction adjusting unit may be set such that the effective display unit can switch between the first quadrant and the second quadrant, or between the third or fourth quadrant, the vertical direction The adjustment unit is then arranged to allow the active display unit to switch between the first quadrant and the fourth quadrant, or between the second or third quadrant.

5A and 5B are schematic views showing the adjustment of the off-axis in the horizontal direction in one embodiment of the present invention. In FIG. 5A, the effective display unit 514 of the projector display chip is located in the fourth quadrant of the object plane, and is provided with four on the projection lens connection surface 512 (the rectangular structure defined by the leftmost to rightmost border line in FIG. 5A). a waist groove 502, and the projection lens is fixed on the illumination system connecting base 510 (the dotted line defined by the dotted line to the rightmost border line in FIG. 5A) with four lens locking screws 504, at which time the locking screw 504 is located. The left end of the waist groove 502.

When the position of the projector changes and the off-axis direction of the projector needs to be adjusted, the four lens locking screws 504 can be released to move the projection lens connection surface 512 to the right, and the illumination system is connected to the socket 510 (FIG. 5B) The dotted line to the leftmost border line defines a rectangular structure that remains stationary, so that the lens locking screw 504 is located at the right end of the waist groove, and then the screw is locked, at which time the effective display unit 514 moves from the fourth quadrant to the third The quadrant completes the off-axis adjustment of the projector in the horizontal direction.

In the present invention, the aforementioned adjustment unit may be an electric or manual mode, wherein the projection lens may be a fixed focus lens or a zoom lens. When using a zoom lens, a focusing unit for autofocusing the projection lens can be added. Regarding the auto-focusing unit, the technical solutions in the patents such as CN203012335U, CN203012334U, and CN203012332U can be used.

Claims

A projection system having a bidirectional off-axis, wherein, in the projection system, the object plane of the projection lens is a plane plane, and the intersection of the optical axis of the projection lens and the object plane is The origin, dividing the object plane into four quadrants, the effective display unit of the projection display device in the projection system is set to have an off-axis greater than 70% in the horizontal direction and an off-axis greater than 70% in the vertical direction. .
A projection system having a bidirectional off-axis according to claim 1, further comprising a first adjustment unit for adjusting an off-axis of said effective display unit in a horizontal direction, and/or for adjusting said effective A second adjustment unit that displays the off-axis of the unit in the vertical direction.
The projection system with bidirectional off-axis according to claim 2, wherein in the first adjusting unit and/or the second adjusting unit, by adjusting the relative position of the effective display unit and the projection lens in the projection system The position is to adjust the off-axis of the effective display unit in the horizontal and/or vertical direction.
The projection system with bidirectional off-axis according to claim 1, wherein the effective display unit is set such that an off-axis in the horizontal direction is greater than or equal to 100%, and an off-axis in the vertical direction is also greater than or equal to 100. %, that is, the effective display unit is set to be located only in one of the quadrants of the object plane.
A projection system having a bidirectional off-axis according to claim 4, further comprising means for adjusting an off-axis of said effective display unit in a horizontal direction to be between said first quadrant and said second quadrant, or third Or a third adjustment unit that switches between the fourth quadrants, and/or for adjusting the off-axis of the active display unit in the vertical direction to be between the first quadrant and the fourth quadrant, or the second or third quadrant The fourth adjustment unit that switches between.
The projection system with bidirectional off-axis according to claim 5, wherein in the third adjusting unit and/or the fourth adjusting unit, by adjusting the relative position of the effective display unit and the projection lens in the projection system The position is to adjust the off-axis of the effective display unit in the horizontal and/or vertical direction.
Projection system with bidirectional off-axis according to any one of claims 1 to 6, characterized in that The projection lens is a fixed focus lens or a zoom lens.
The projection system with bidirectional off-axis according to claim 7, wherein the projection lens is a zoom lens, and further includes a focusing unit that performs auto focus processing on the projection lens.