Automatic focusing projection ray machine

Abstract

The invention provides an automatic focusing projection ray machine which comprises a shell, and a light source and a lens are arranged in the shell. The optical system is configured to conduct light of the light source to the light regulation and control chip; the light regulation and control chip is configured to receive light rays transmitted from the optical system, regulate and control the light rays and transmit the light rays to the lens; the reciprocating motion device is connected with the light regulation and control chip and is configured to drive the light regulation and control chip to reciprocate along the optical axis so as to adjust the distance to the lens; the laser distance sensor is configured to measure the distance from the ray machine to a projected object; and the automatic focusing control device is in electric signal connection with the reciprocating motion device and the laser distance sensor and is configured to receive and control the reciprocating motion device to drive the light regulation and control chip to move according to measurement information of the laser distance sensor so as to focus the projection light machine.

Description

Technical Field

[0001] The invention patent relates to the field of projection imaging and three-dimensional visual imaging, and in particular to an automatic focusing method of a projection optical machine. Background Art

[0002] Projection optical machines are widely used in the field of structured light three-dimensional measurement and are often used to project structured optical information to encode the surface of objects.

[0003] The current focusing method of projection optical machine is mainly to change the virtual image distance by manually or electrically adjusting the movement of the lens group of the lens at the lens end. v Conditions for achieving clear imaging: .in u It refers to the object distance, that is, the distance of the projected object from the lens; v It refers to the image distance, that is, the distance between the plane where the light control chip is located and the lens; f Refers to the focal length of the lens.

[0004] In the currently common projection optical machines, the light control chip is fixed inside the optical machine and cannot move. After being fixed, it is basically impossible to adjust the distance between the light control chip and the optical machine lens interface. The focusing is mainly completed by rotating the lens driven by a motor to move the lens group back and forth. The structure is relatively complex and the cost is high. The lens is in contact with the outside world, and external dust enters the lens telescopic mechanism, which can easily cause the transmission mechanism to get stuck and affect the adjustment action, making it impossible to accurately focus through the lens adjustment method. In addition, some lenses, such as telecentric lenses, cannot adjust the back and forth movement of the lens group, and thus the autofocus function cannot be achieved. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an autofocus projection optical machine, which can achieve high-precision autofocus of the projection optical machine through the movement of the light control chip, simplify the transmission system, reduce costs, and avoid the problem that the lens cannot be accurately focused due to external interference; it can also solve the problem that sometimes the focusing function cannot be achieved at the lens end by adjusting the lens group to move back and forth.

[0006] In order to achieve the above object, the present invention provides a technical solution of an auto-focus projection optical machine: A projection light machine with automatic focus comprises: a housing; a light source and a lens, which are respectively arranged in the housing; an optical system configured to transmit light from the light source to a light control chip; the light control chip, which is configured to receive the light transmitted from the optical system, and transmit it to the lens after control; a reciprocating motion device, which is connected to the light control chip and is configured to drive the light control chip to move along the optical axis to adjust the distance to the lens; a distance detection device, which is configured to measure the distance from the projection light machine to the projected object; and an automatic focus control device, which is electrically connected to the reciprocating motion device and the distance detection device, and is configured to receive and control the reciprocating motion device to drive the light control chip to move according to the measurement information of the distance detection device, so as to focus the projection light machine.

[0007] Furthermore, the light control chip includes but is not limited to a silicon-based liquid crystal chip, a TFT liquid crystal chip or a digital micro-vibration mirror array chip.

[0008] Furthermore, the reciprocating motion device is fixed inside the optical machine and is configured to drive the light control chip to reciprocate along the normal direction of the radial surface of the lens to change the relative distance between the imaging light control chip and the lens interface.

[0009] Furthermore, the power component of the reciprocating motion device includes but is not limited to one of an electromagnetic servo motor, a piezoelectric driver, a voice coil motor, an ultrasonic motor and a linear motor.

[0010] Furthermore, the distance detection device is a laser distance sensor arranged on the optical machine housing outside the lens, and the automatic focusing control device is configured to receive the distance from the projection optical machine to the projected object measured by the laser distance sensor, and control the reciprocating motion device to drive the light control chip to change the distance from the light control chip to the lens.

[0011] Furthermore, the autofocus control device includes but is not limited to a single chip microcomputer, a micro control chip or an artificial intelligence controller.

[0012] The beneficial effects of the provided auto-focus projection optical machine are mainly reflected in: 1. By connecting the light control chip with the reciprocating motion device inside the housing of the projection optical machine, the reciprocating motion device drives the light control chip to move along the optical axis to adjust the lens distance, thereby achieving precise adjustment, simplifying the transmission mechanism, reducing costs, and improving the focus adjustment accuracy; 2. The light control chip and reciprocating motion mechanism are both set inside the shell, which avoids the problem of jamming during the focus adjustment process and difficulty in high-precision adjustment caused by external dust, which is conducive to maintaining the adjustment accuracy; 3. By setting up a distance detection device, the distance of the projected object is automatically detected, and the reciprocating motion device is controlled accordingly to drive the light control chip to change the distance from the light control chip to the lens, thereby improving the adaptability and efficiency of the adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A schematic structural diagram of an embodiment of a provided auto-focus projection optical machine; Figure 2 The figure is a working principle diagram of a projection optical machine using the provided autofocus.

[0014] Description of the accompanying drawings: 1- housing; 2- Light source; 3-optical system, 31-condenser, 32-homogenizer, 33-relay lens, 34-beam splitter; 4-Light control chip; 5- Reciprocating motion device; 6-Distance detection device; 7-Auto focus control device; 8- Lens; 9-Projected object. DETAILED DESCRIPTION

[0015] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, and the composition of the materials described in these embodiments are merely exemplary and not intended to be limiting.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements.

[0017] like Figure 1 and Figure 2As shown, an autofocus projection light machine, the light source 2 and the lens 8 are respectively arranged at the first end and the second end of the shell 1; the optical system 3 is arranged at the rear side of the light source 2, and is configured to transmit the light of the light source 2 to the light regulation chip 4; the light regulation chip 4 is arranged at the front side of the lens 8, and is configured to receive the light transmitted by the optical system 3, and transmit it to the lens 8 after regulation; the reciprocating motion device 5 is connected to the light regulation chip 4, and is configured to drive the light regulation chip 4 to move along the optical axis and adjust the distance to the lens 8; the distance detection device 6 is configured to measure the distance from the projection light machine to the projected object 9; and the autofocus control device 7 is electrically connected to the reciprocating motion device 5 and the distance detection device 6, and is configured to receive and control the reciprocating motion device 5 to drive the light regulation chip 4 to move according to the measurement information of the distance detection device 6, so as to focus the projection light machine.

[0018] During implementation, the optical system 3 includes a condenser 31, a light homogenizer 32, a relay lens 33 and a beam splitter 34, which are sequentially arranged between the light source 2 and the light control chip 4. The light emitted by the light source 2 is sequentially transmitted through the condenser 31, the light homogenizer 32, the relay lens 33 and the beam splitter 34 and then irradiated on the light control chip 4. The light transmission direction of the light source 2 is arranged along the horizontal direction, and the light transmission directions of the light control chip 4 and the lens 8 are arranged along the vertical direction. The beam splitter 34 of the optical system 3 receives the horizontal light of the light source 2, adjusts it to the vertical direction, and then transmits it to the light control chip 4.

[0019] During the adjustment process, the reciprocating motion device 5 is fixed inside the optical machine and is configured to drive the light control chip 4 to reciprocate along the normal direction of the radial surface of the lens 8 to change the relative distance between the imaging light control chip 4 and the interface of the lens 8. The light control chip 4 includes but is not limited to one or a combination of a silicon-based liquid crystal chip or a digital micro-vibration mirror array chip.

[0020] The light control chip can be a liquid crystal on silicon (LCoS) chip, a TFT liquid crystal chip or a digital micro-mirror array (DMD) chip, and the reciprocating motion device drives the light control chip to reciprocate along the optical axis of the lens. The reciprocating motion device is electrically adjusted. The reciprocating motion device is fixed inside the optical machine and connected to the light control chip. It can drive the light control chip to reciprocate along the normal direction of the radial surface of the lens, change the relative distance between the imaging light control chip and the lens interface, and can improve the focusing speed of the projection optical machine and reduce the focusing cost.

[0021] The power component of the reciprocating motion device 5 includes, but is not limited to, one of an electromagnetic servo motor, a piezoelectric driver, a voice coil motor, an ultrasonic motor, and a linear motor. The reciprocating motion device 5 is provided with a transmission mechanism between the power component and the light control chip 4, and the transmission mechanism includes one or a combination of a ball screw structure, a servo electric cylinder structure, a cam mechanism, or a crank slider structure.

[0022] The automatic focus control device 7 includes but is not limited to a single chip microcomputer, a microcontroller chip or an artificial intelligence controller. The laser distance sensor measures the distance between the optical machine and the projected object, and then drives the light control chip 4 to reciprocate through the reciprocating motion device 5 to realize the automatic focus of the projection optical machine.

[0023] During the implementation process, the distance detection device 6 is a laser distance sensor arranged on the outer shell 1 of the lens 8, and the automatic focusing control device is configured to receive the distance from the projection light machine to the projected object 9 measured by the laser distance sensor, and control the reciprocating motion device 5 to drive the light control chip 4 to change the distance from the light control chip 4 to the lens 8.

[0024] The provided autofocus projection optical machine has a reciprocating motion device inside the shell of the projection optical machine that drives the light control chip to move along the optical axis to adjust the lens distance, thereby achieving precise adjustment, simplifying the transmission mechanism, reducing costs, improving focus adjustment accuracy, and improving the adaptability and efficiency of adjustment.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auto-focus projection optical machine, characterized in that: include: Housing (1); The light source (2) and the lens (8) are respectively arranged in the housing (1); The optical system (3) is configured to transmit the light from the light source (2) to the light control chip (4); A light control chip (4) configured to receive light transmitted from the optical system (3), control the light, and then transmit the light to the lens (8); A reciprocating motion device (5) connected to the light regulating chip (4) and configured to drive the light regulating chip (4) to move along the optical axis to adjust the distance to the lens (8); A distance detection device (6) configured to measure the distance from the projection light machine to the projected object (9); as well as The automatic focus control device (7) is electrically connected to the reciprocating motion device (5) and the distance detection device (6), and is configured to receive and control the reciprocating motion device (5) to drive the light control chip (4) to move according to measurement information of the distance detection device (6), thereby focusing the projection light machine.

2. The auto-focus projection optical machine according to claim 1, characterized in that: The light control chip (4) includes but is not limited to a silicon-based liquid crystal chip, a TFT liquid crystal chip or a digital micro-vibration mirror array chip.

3. The auto-focus projection optical machine according to claim 1, characterized in that: The reciprocating motion device (5) is fixed inside the optical machine and is configured to drive the light control chip (4) to reciprocate along the normal direction of the radial surface of the lens (8) to change the relative distance between the imaging light control chip (4) and the interface of the lens (8).

4. The auto-focus projection optical machine according to claim 3, characterized in that: The power component of the reciprocating motion device (5) includes, but is not limited to, one of an electromagnetic servo motor, a piezoelectric drive, a voice coil motor, an ultrasonic motor and a linear motor.

5. The auto-focus projection optical machine according to claim 1, characterized in that: The distance detection device (6) is a laser distance sensor arranged on the optical machine housing (1) outside the lens (8), and the automatic focus control device is configured to receive the distance from the projection optical machine to the projected object (9) measured by the laser distance sensor, and control the reciprocating motion device (5) to drive the optical control chip (4) to change the distance from the optical control chip (4) to the lens (8).

6. The auto-focus projection optical machine according to claim 1 or 5, characterized in that: The automatic focus control device (7) includes but is not limited to a single chip microcomputer, a micro control chip or an artificial intelligence controller.

7. The auto-focus projection optical machine according to claim 1 or 5, characterized in that: A grating ruler for monitoring the forward and backward movement distance of the light control chip (4) is arranged in the housing.

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