Method for reducing sensing error of light sensor and light sensor

Abstract

The invention belongs to the field of light sensor manufacturing, and particularly relates to a method for reducing sensing errors of a light sensor and the light sensor. Comprising the following steps of: 1) dividing any plane M which can be penetrated by light which enters a CMOS (Complementary Metal Oxide Semiconductor) light receiver in the light sensor and is emitted by a light-emitting device in the light sensor into a plurality of small rectangular units with the same size and shape; 2) the CMOS light receiver is in signal connection with the control chip; (3) a numerical value A and a numerical value B are preset in the control chip, A is the minimum number of the small rectangular units occupied by the light spots received by the CMOS light receiver when the light sensor does not sense the object, and B is the maximum number of the small rectangular units occupied by the light spots received by the CMOS light receiver when the light sensor senses the object; and the number A and the number B are set, so that the sensor is prevented from false alarm when some dust exists and highlight products are sensed.

Description

Technical Field

[0001] The present application relates to the field of light sensor manufacturing, and specifically to a method for reducing sensing errors of a light sensor and a light sensor. Background Art

[0002] If dust settles on the sensing surface of a light sensor and affects the propagation of light, it can cause false sensing. This means the light sensor mistakenly perceives an object when it shouldn't. Furthermore, when sensing shiny products (such as stainless steel or electroplated products), the reflective surface of the object causes the emitted light to enter the light sensor's receiving end, leading to false sensing. Therefore, a method or product that can overcome these two shortcomings is needed. Summary of the Invention

[0003] The purpose of this application is mainly to address the shortcomings of the existing technology and the problems encountered.

[0004] In order to achieve the above objectives, the technical solution adopted in this application is:

[0005] A method for reducing sensing errors in a light sensor comprises: 1) dividing any plane M on a CMOS light receiver in the light sensor, through which light emitted by a light-emitting device in the light sensor can penetrate, into a plurality of rectangular cells of equal size and shape; 2) connecting the CMOS light receiver signal to a control chip; and 3) presetting a value A and a value B in the control chip, where A represents the minimum number of rectangular cells occupied by a light spot received by the CMOS light receiver when the light sensor does not sense an object, and B represents the maximum number of rectangular cells occupied by a light spot received by the CMOS light receiver when the light sensor senses an object.

[0006] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver when the light sensor is not sensing an object is less than A, it means that the light sensor is contaminated;

[0007] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver when the light sensor is not sensing an object is less than A and greater than or equal to A, it indicates that the light sensor is not contaminated;

[0008] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver when the light sensor senses an object is less than B, it means that the object is sensed normally;

[0009] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver when the light sensor senses an object is greater than B, it means that the object is not sensed normally or the surface of the sensed object has high light properties.

[0010] Preferably, the plane M is perpendicular to the light that can be received by the CMOS light receiver.

[0011] Preferably, the distance between any two adjacent rectangular cells is 0.

[0012] Preferably, the ratio of the number A to the normal number of rectangular small units occupied by the light spot emitted by the light-emitting device on the plane M is 0.8, and the ratio of the number B to the normal number of rectangular small units occupied by the light spot emitted by the light-emitting device on the plane M is 0.3.

[0013] A light sensor capable of preventing interference from reflected light from a sensed object comprises a housing, a reflector, a CMOS light receiver, a control chip, a flat glass sheet, and the above-mentioned control chip. A light hole is provided on one side wall of the housing. The reflector is provided outside the housing via a support rod. The flat glass sheet is provided inside the housing. The angle between the flat glass sheet and the axis of the light hole is 45°. The axis of the light hole passes through the flat glass sheet. The CMOS light receiver is provided on the side of the flat glass sheet facing away from the light hole. The CMOS light receiver is coaxial with the light hole. A light-emitting light board is provided on the side of the flat glass sheet facing away from the CMOS light receiver. Light emitted by the light-emitting light board onto the flat glass sheet is reflected by the flat glass sheet and then emitted from the light hole to the reflector. Light emitted by the light-emitting light board onto the flat glass sheet is parallel to the axis of the light hole after being reflected by the flat glass sheet. The axis of the light hole is perpendicular to the mirror surface of the reflector.

[0014] Preferably, the plane M is the reflecting surface of the reflector.

[0015] Preferably, a convex lens is provided in the housing between the CMOS light receiver and the flat glass sheet, and the CMOS light receiver is located within one focal length of the convex lens.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] This application uses a support rod composed of a rod unit, a female snap-on head and a male snap-on head in combination with a cloth to design a foldable enclosure, so that the enclosure can be stored when not in use, and can be conveniently unfolded and supported when in use, solving the problem that current enclosures are inconvenient to fold and store for easy carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a light sensor capable of preventing interference from light reflections from sensed objects in this application;

[0019] Figure 2 for Figure 1 A schematic diagram showing a reflector is shown in FIG.

[0020] Figure 3 for Figure 1 Light path diagram.

[0021] Among them, 1. Shell; 2. Reflector; 3. CMOS light receiver; 4. Control chip; 5. Flat glass sheet; 6. Light hole; 7. Support rod; 8. Convex lens; 9. Flat M; 10. Rectangular small unit; 11. Light board. DETAILED DESCRIPTION

[0022] like Figure 1-3 As shown, a method for reducing light sensor sensing errors includes: 1) dividing any plane M9 on a CMOS light receiver 3 in the light sensor that can be penetrated by light emitted by a light-emitting device in the light sensor into a plurality of rectangular cells 10 of the same size and shape; 2) connecting the signal of the CMOS light receiver 3 to a control chip 4; 3) presetting a value A and a value B in the control chip 4, where A is the minimum number of rectangular cells 10 occupied by the light spots received by the CMOS light receiver 3 when the light sensor does not sense an object, and B is the maximum number of rectangular cells 10 occupied by the light spots received by the CMOS light receiver 3 when the light sensor senses an object;

[0023] If the number of rectangular cells 10 occupied by the light spot received by the CMOS light receiver 3 when the light sensor is not sensing an object is less than A, it means that the light sensor is contaminated;

[0024] If the number of rectangular cells 10 occupied by the light spot received by the CMOS light receiver 3 when the light sensor is not sensing an object is less than A and greater than or equal to A, it indicates that the light sensor is not contaminated;

[0025] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver 3 when the light sensor senses an object is less than B, it means that the object is sensed normally;

[0026] If the number of rectangular cells occupied by the light spot received by the CMOS light receiver 3 when the light sensor senses an object is greater than B, it means that the object is not sensed normally or the surface of the sensed object has high light properties.

[0027] With this design, if fine dust falls on the reflector 2, when the area covered by the dust is not large enough, that is, when the covered area is less than the quantity A, it will not affect the light sensor's sensing of the workpiece; similarly, when the light sensor senses the workpiece, if the workpiece is a high-gloss product, when the workpiece moves to the reflector 2, it reflects a beam of light with a cross-sectional area smaller than B, and the light sensor will not mistakenly judge it as sensing a product.

[0028] As a preferred embodiment, the plane M9 is perpendicular to the light that can be received by the CMOS light receiver 3. This vertical arrangement is more accurate and facilitates calculations in the control chip 4.

[0029] As a preferred method, the distance between any two adjacent rectangular units 10 is 0, that is, Figure 2 However, in reality, if the precision requirement is not high, a preset gap can still be provided between two adjacent rectangular units 10 .

[0030] As a preferred embodiment, the ratio of the number A to the normal number of rectangular cells occupied by the light spot emitted by the light-emitting device on plane M9 is 0.8, and the ratio of the number B to the normal number of rectangular cells 10 occupied by the light spot emitted by the light-emitting device on plane M9 is 0.3. With this design, if the cross-section of the light beam received by the CMOS light receiver 3 is greater than 0.3 times the cross-section of the light beam transmitted from the housing 1 through the light hole 6, it indicates that the product has not been recognized.

[0031] A light sensor capable of preventing interference from reflected light from a sensed object comprises a housing 1, a reflector 2, a CMOS light receiver 3, a control chip 4, a flat glass sheet 5, and the control chip 4. A light hole 6 is provided on one side wall of the housing. The reflector 2 is provided on the outside of the housing 1 via a support rod 7. The flat glass sheet 5 is provided inside the housing 1. The angle between the flat glass sheet 5 and the axis of the light hole 6 is 45°. The axis of the light hole 6 passes through the flat glass sheet 5. The side of the flat glass sheet 5 facing away from the light hole 6 is A CMOS light receiver 3 is provided, and the CMOS light receiver 3 is coaxial with the light hole 6. A light-emitting light board 11 is provided on the side of the flat glass sheet 5 facing away from the CMOS light receiver 3. The light emitted by the light-emitting light board 11 onto the flat glass sheet 5 is reflected by the flat glass sheet 5 and then emitted from the light hole 6 to the reflector 2. The light emitted by the light-emitting light board 11 onto the flat glass sheet 5 is reflected by the flat glass sheet 5 and is parallel to the axis of the light hole 6. The axis of the light hole 6 is perpendicular to the mirror surface of the reflector 2.

[0032] As a preferred embodiment, the plane M9 is the reflecting surface of the reflector 2 .

[0033] As a preferred embodiment, a convex lens 12 is provided between the CMOS light receiver 3 and the flat glass sheet 5 in the housing 1, and the CMOS light receiver 3 is located within one focal length of the convex lens 12. Figure 2 As shown, the CMOS light receiver 3 can completely receive the light reflected by the reflector 2 .

Claims

1. A method for reducing light sensor sensing errors, characterized in that: 1) dividing any plane M (9) on a CMOS light receiver (3) in a light sensor that can be penetrated by light emitted by a light emitting device in the light sensor into a plurality of rectangular small units (10) of the same size and shape; 2) connecting the CMOS light receiver (3) signal to a control chip (4); 3) presetting a value A and a value B in the control chip (4), wherein A is the minimum number of rectangular small units (10) occupied by light spots received by the CMOS light receiver (3) when the light sensor does not sense an object, and B is the maximum number of rectangular small units (10) occupied by light spots received by the CMOS light receiver (3) when the light sensor senses an object; If the number of rectangular cells (10) occupied by the light spot received by the CMOS light receiver (3) when the light sensor is not sensing an object is less than A, it indicates that the light sensor is contaminated; If the number of rectangular cells (10) occupied by the light spot received by the CMOS light receiver (3) when the light sensor does not sense an object is less than A and greater than or equal to A, it indicates that the light sensor is not contaminated; If the number of rectangular cells occupied by the light spot received by the CMOS light receiver (3) when the light sensor senses an object is less than B, it means that the object is sensed normally; If the number of rectangular cells occupied by the light spot received by the CMOS light receiver (3) when the light sensor senses an object is greater than B, it means that the object is not sensed normally or the surface of the sensed object has high light properties.

2. The method for reducing light sensor sensing errors according to claim 1, wherein: The plane M (9) is perpendicular to the light that can be received by the CMOS light receiver (3).

3. The method for reducing light sensor sensing errors according to claim 1, wherein: The distance between any two adjacent rectangular cells (10) is 0.

4. The method for reducing light sensor sensing errors according to claim 1, wherein: The ratio of the number A to the normal number of rectangular small units occupied by the light spot emitted by the light-emitting device on the plane M (9) is 0.8, and the ratio of the number B to the normal number of rectangular small units (10) occupied by the light spot emitted by the light-emitting device on the plane M (9) is 0.

3.

5. A light sensor capable of preventing interference from reflected light from a sensed object, characterized in that: The invention comprises a housing (1), a reflector (2), a CMOS light receiver (3), a control chip (4), a flat glass sheet (5), and the control chip (4) described in claim 1, wherein a light hole (6) is provided on one side wall of the housing, the reflector (2) is provided outside the housing (1) via a support rod (7), the flat glass sheet (5) is provided inside the housing (1), the angle between the flat glass sheet (5) and the axis of the light hole (6) is 45°, the axis of the light hole (6) passes through the flat glass sheet (5), and the CMOS is provided on the side of the flat glass sheet (5) facing away from the light hole (6). An S light receiver (3) is provided, wherein the CMOS light receiver (3) is coaxial with the light-through hole (6); a light-emitting lamp board (11) is provided on the side of the plane glass sheet (5) facing away from the CMOS light receiver (3); light emitted by the light-emitting lamp board (11) onto the plane glass sheet (5) is reflected by the plane glass sheet (5) and then emitted from the light-through hole (6) onto the reflector (2); light emitted by the light-emitting lamp board (11) onto the plane glass sheet (5) is reflected by the plane glass sheet (5) and is parallel to the axis of the light-through hole (6); and the axis of the light-through hole (6) is perpendicular to the mirror surface of the reflector (2).

6. The light sensor capable of preventing interference from reflected light from a sensed object according to claim 5, characterized in that: The plane M (9) is the reflecting surface of the reflecting mirror (2).

7. The light sensor capable of preventing interference from reflected light from a sensed object according to claim 5, characterized in that: A convex lens (12) is provided in the housing (1) between the CMOS light receiver (3) and the flat glass sheet (5), and the CMOS light receiver (3) is located within one focal length of the convex lens (12).

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