WO2019071437A1

WO2019071437A1 - Projection system having monitoring device

Info

Publication number: WO2019071437A1
Application number: PCT/CN2017/105562
Authority: WO
Inventors: 那庆林; 麦浩晃; 黄彦
Original assignee: 神画科技（深圳）有限公司
Priority date: 2017-10-10
Filing date: 2017-10-10
Publication date: 2019-04-18

Abstract

A projection system having a monitoring device comprises a projector (100) and a monitoring device (200). A projection lens is provided in the projector. A monitoring lens (201) and a monitoring imaging chip (202) are provided in the monitoring device. An optical axis (PO) of the projection lens is not parallel with an optical axis (CO') of the monitoring lens. This structure enables the monitoring device to cover an entire projected image at a shorter projection distance, thereby increasing coverage of the monitoring device, and solving the problem in the prior art in which a monitoring lens cannot cover an entire projected image if the projected image is small.

Description

Projection system with monitoring device

Technical field

This invention relates to projection systems and, more particularly, to a projection system with a monitoring device.

Background technique

With the development of projection display technology and application development, many new applications require the acquisition of projection images and their associated image processing, which requires the addition of surveillance cameras to the projection system.

In the utility model patent of CN203720518U, a "projection system with a monitoring device" is disclosed, which includes a projector, the projector includes a projector body and a projection lens; and the light emitted by the projector body At least one of the lens groups is projected through the projection lens to form a projection picture. Also included is a monitoring device added to the projector; the monitoring device includes a monitoring module and a focusing device, and the monitoring module includes a monitoring lens and a visible light monitoring chip. The visible light emitted by the projection picture enters the monitoring lens and is incident on the visible light monitoring chip to form a monitoring picture. The focusing device comprises a focusing control unit and a focusing motor. The focusing control unit analyzes the monitoring screen on the visible light monitoring chip, and sends a control signal to the focusing motor to adjust the lens group to a suitable position, thereby achieving automatic focusing. The function. In the projection system, the relationship between the projector and the monitoring device is roughly as shown in Figs. 1 and 2 .

Due to the influence of the internal space of the projection system, the distance between the projection lens and the monitoring lens is unlikely to be small, which makes the surveillance lens not completely cover the projection image when the projection image is a small-sized image, and is limited in use. .

technical problem

The invention solves the problem that the monitoring lens cannot completely cover the projection picture when the projection picture is small in the prior art.

Problem solution

Technical solution

The technical solution adopted by the present invention to solve the technical problem thereof is to provide a projection system with a monitoring device, including a projector and a monitoring device; the projector is provided with a projection lens, and the monitoring device is provided with a monitoring lens and Monitoring an imaging chip; wherein an optical axis of the projection lens and an optical axis of the monitoring lens a non-parallel relationship between the optical axis of the projection lens and perpendicular to the first plane of the projector placement plane and the optical axis of the monitoring lens and perpendicular to the second plane of the projector placement plane In an intersecting relationship, the angle between the first plane and the second plane is 0° to 45°; or the first plane and the second plane are in parallel or overlapping relationship, and An optical axis of the projection lens and a third plane perpendicular to the first plane intersects with an optical axis of the monitoring lens and a fourth plane perpendicular to the second plane, the third The angle between the plane and the fourth plane is 0° to 45°.

In a preferred embodiment of the projection system of the present invention, an angle between the first plane and the second plane is 0° to 45°, and an optical axis of the projection lens is intersected with an optical axis of the monitoring lens. The angle between the two optical axes is 0° to 45°.

In another preferred embodiment of the projection system of the present invention, an angle between the first plane and the second plane is 0° to 45°, and an optical axis of the projection lens is different from an optical axis of the monitoring lens. Face relationship.

In the projection system of the present invention, the optical axis of the monitoring lens may be parallel to the plane in which the projector is placed. Alternatively, the optical axis of the surveillance lens can intersect the projector placement plane.

In the projection system of the present invention, the monitoring imaging chip is a CMOS or a CCD.

Advantageous effects of the invention

Beneficial effect

The invention has the following beneficial effects: the optical axis of the projection lens of the invention is non-parallel relationship with the optical axis of the monitoring lens, and the structure can make the monitoring device cover all the projection images at a shorter projection distance, that is, It is said that the coverage of the monitoring device is wider, so as to solve the problem that the monitoring lens cannot completely cover the projected image when the projection picture is small in the prior art.

Brief description of the drawing

DRAWINGS

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

1 is a schematic diagram showing the relationship between a projector and a monitoring device in the prior art;

2 is a schematic view of the prior art when the projector and the monitoring device are closer together;

3 is a schematic diagram showing the relationship between a projector and a monitoring device in a preferred embodiment of the present invention;

4 is a schematic diagram showing the relationship between a projector and a monitoring device in a second embodiment of the present invention;

Figure 5 is a diagram showing the relationship between a projector and a monitoring device in a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

In a preferred embodiment of the invention, the relationship between the projector and the monitoring device is as shown in FIG. 3, in which the monitoring device 200 is on the right side of the projector 100. P point in Figure 3 is the main point of the projection lens in the projector (if the imaging lens is ideally regarded as a small hole imaging model, then this small hole is called the main point of the lens), PO is the optical axis of the projection lens; The point is the main point of the monitoring lens 201 in the monitoring device 200, and CO' is the optical axis of the monitoring lens; as can be seen from Fig. 3, PO and CO' intersect. It is also possible to regard the paper surface as the placement plane of the projector, and pass PO and CO' respectively to make the first plane and the second plane perpendicular to the paper surface, and the first and second planes are in an intersecting relationship.

In this embodiment, the monitoring lens is used to form a monitoring image that is greater than or equal to the projected image, that is, the viewing angle β of the monitoring lens is greater than or equal to the viewing angle α of the projection lens. The visible light emitted from the projection screen enters the monitoring lens, and then enters the monitoring imaging chip 202 to form a visible light monitoring screen. Preferably, the monitoring imaging chip 202 comprises a CMOS or CCD.

In Fig. 3, AB is the minimum projection picture that the monitoring lens can acquire, L is the projection distance of this minimum projection picture, and d is the distance between the two lens main points P and C. The optical axis of the monitoring lens is parallel to the plane on which the projector is placed; θ is the angle between PO and CO', which is about 30°; in specific implementation, θ can also be adjusted between 0° and 45°, of course, must be greater than 0°, ensuring that they are intersecting rather than parallel.

1 is a schematic diagram of the relationship between the projector and the monitoring device in the prior art. Comparing FIG. 3 with FIG. 1 , it can be seen that FIG. 1 is the same angle of view, the same distance d of the main point; the difference is FIG. 1 The middle projection optical axis PO and the monitoring optical axis CO' are in a parallel relationship. As can be seen from Fig. 1, the minimum projection picture AB collected by the monitoring lens at this time is much larger than that in Fig. 3. L1 is the projection distance of the minimum projection picture at this time, and L1>L. When the projection distance is less than L1, the surveillance lens cannot completely cover the projection picture. That is to say, when the projection picture is small, the surveillance lens cannot completely cover the projection picture.

2 is a schematic view of the prior art when the projector and the monitoring device are closer together. Even if the monitoring lens is as close as possible to the projection lens as shown in Fig. 2, although a smaller projection picture can be acquired, the minimum projection picture is still much larger than that of Fig. 3. Moreover, due to the specific structural limitations of the projector, for example, the projection lens focusing mechanism and the heat dissipation structure are required, the monitoring lens cannot be unrestrictedly close to the projection lens; and some projection functions require the distance between the monitoring lens and the projection lens as far as possible. These are limits The monitoring lens is infinitely close to the projection lens.

4 is a schematic diagram showing the relationship between the projector and the monitoring device according to the second embodiment of the present invention. Compared with the first embodiment, in the present embodiment, the two faces perpendicular to the paper surface through PO and CO' are also formed. Intersecting relationship, but the position of the monitoring lens is far away from the projection lens. The monitoring lens is located at the lower right of the projection lens. At this time, the optical axis CO' of the monitoring lens is in a different relationship with the optical axis PO of the projection lens (ie, Will not intersect, not on the same plane). Since the monitoring device is tilted to the left with respect to the projector, so that the effective monitoring range of the monitoring device becomes large, the effect of the first embodiment can also be achieved, so that the monitoring device can completely capture a smaller projection picture.

FIG. 5 is a schematic diagram showing the relationship between a projector and a monitoring device according to a third embodiment of the present invention. In this embodiment, the monitoring device is located directly below the projector, and the optical axis CO′ of the monitoring lens and the optical axis PO of the projection lens are monitored. Intersect relationship; of course, it can also be regarded as the first plane perpendicular to the plane of the projector placement made by the optical axis PO of the projection lens and the plane perpendicular to the plane of the projector made by the optical axis CO' of the monitoring lens. The two planes overlap each other, that is, overlap the paper surface in FIG. 5; and then respectively make the optical axis PO of the projection lens and perpendicular to the third plane of the first plane and the optical axis CO' of the supervising lens and perpendicular to a fourth plane of the second plane, wherein the third plane and the fourth plane are in an intersecting relationship, and an angle between the two is 0° to 45°.

On the basis of the embodiment shown in FIG. 5, if the monitoring device is moved a little in the direction of the vertical paper so that the optical axis CO' of the monitoring lens does not intersect with the optical axis PO of the projection lens, the foregoing A plane and the second plane no longer overlap each other, but are parallel to each other; but the third plane and the fourth plane are still in an intersecting relationship, and the angle between the two is 0° to 45°.

It is to be understood that the above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are used directly or indirectly. Other related technical fields are equally included in the scope of patent protection of the present invention.

Claims

A projection system with a monitoring device, comprising a projector and a monitoring device; the projector is provided with a projection lens, wherein the monitoring device is provided with a monitoring lens and a monitoring imaging chip;

Characterizing in that the optical axis of the projection lens is in a non-parallel relationship with the optical axis of the monitoring lens;

An intersection relationship between a first plane perpendicular to an optical axis of the projection lens and a plane perpendicular to an optical axis of the monitor lens and perpendicular to a plane in which the projector is placed, The angle between the first plane and the second plane is 0° to 45°;

Or a parallel or overlapping relationship between the first plane and the second plane, and passing the optical axis of the projection lens and perpendicular to the third plane of the first plane and the light passing through the monitoring lens The axis and the fourth plane perpendicular to the second plane are in an intersecting relationship, and the angle between the third plane and the fourth plane is 0° to 45°.
The projection system with a monitoring device according to claim 1, wherein an angle between the first plane and the second plane is 0° to 45°, and an optical axis of the projection lens is The optical axis of the monitoring lens is in an intersecting relationship, and the angle between the two optical axes is 0° to 45°.
The projection system with a monitoring device according to claim 1, wherein an angle between the first plane and the second plane is 0° to 45°, and an optical axis of the projection lens is The optical axis of the monitor lens is in a different plane relationship.
A projection system with a monitoring device according to any one of claims 2-3, wherein the optical axis of the monitoring lens is parallel to the projector placement plane.
A projection system with a monitoring device according to any one of claims 2-3, wherein the optical axis of the monitoring lens intersects the projector placement plane.
A projection system with a monitoring device according to any one of claims 1 to 5, wherein the monitoring imaging chip is a CMOS or a CCD.