Novel color code sensor

Abstract

The utility model discloses a novel color code sensor. Comprising a three-color lamp bead, a main control chip, a lamp bead driving circuit, a signal amplification circuit, a photosensitive device and an optical system, the three-color lamp bead is connected with the main control chip through the lamp bead driving circuit, the photosensitive device is connected with the main control chip through the signal amplification circuit, and the optical system is arranged at the three-color lamp bead and the photosensitive device. The optical system is used for guiding light emitted by the three-color lamp beads and guiding reflected light, and the three-color lamp beads can emit three kinds of monochromatic light of red, blue and green. According to the utility model, time-sharing emission is carried out on the surface of an object by virtue of various monochromatic lights, various colors are alternately irradiated, and the reflectivity fed back by the alternate irradiation of the various colors of lights is corrected for multiple times, so that detection errors are avoided; and meanwhile, the circuit arranged on the periphery of the main control chip is used for processing the feedback signal, so that the accuracy of the signal is improved, and the detection stability of the color code sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a novel color mark sensor. Background Art

[0002] As we all know, color mark sensors are used to detect various labels, even against subtle background differences, with fast processing speeds. Color mark sensors are commonly used in the printing and packaging industries, ensuring accurate color registration in the printing industry and positioning of packaging film in the packaging industry. Existing color mark sensors use only a single color of light—typically red, green, blue, or white—to illuminate the object being detected. They distinguish colors based on the varying reflectivity of the light. For example, red and white color marks reflect red light more strongly, while non-red and non-white color marks such as blue and green have relatively low red reflectivity. Similarly, green and white color marks reflect green light more strongly, while red, blue, and other non-green and non-white color marks reflect less green light. Blue and white color marks reflect blue light more strongly, while other non-blue and non-white color marks reflect less blue light. White color marks reflect white light more strongly. Color mark sensors are commonly used in the printing and packaging industries. Especially in the packaging industry, if the packaging film has multiple colors such as red, blue, green, and white, there may be two or more color codes with similar reflectivity to the same light, which may lead to recognition errors.

[0003] Therefore, it is necessary to optimize and improve the existing color mark sensors. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a new color mark sensor that can identify a specified color from a color mark having multiple colors.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A new color mark sensor includes three-color lamp beads, a main control chip, a lamp bead driving circuit, a signal amplification circuit, a photosensor, and an optical system. The three-color lamp beads are connected to the main control chip via the lamp bead driving circuit, and the photosensor is connected to the main control chip via the signal amplification circuit. The optical system is placed between the three-color lamp beads and the photosensor. The optical system is used to guide the light emitted by the three-color lamp beads and the reflected light. The three-color lamp beads can emit three monochromatic lights: red, blue, and green.

[0007] Preferably, the signal amplification circuit includes a fifth capacitor and a sixth capacitor, the sixth capacitor is connected to the power supply through the fifth resistor, the connection point between the sixth capacitor and the fifth resistor is connected to the positive electrode of the photosensitive device, the negative electrode of the photosensitive device is grounded through the first resistor and connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the main control chip and is connected to the sixteenth resistor, the other end of the sixteenth resistor is grounded through the fourth resistor and the seventh capacitor, and is connected to the power supply through the fifteenth resistor.

[0008] Preferably, the three-color lamp bead has three different colors of lamp beads built in, and each lamp bead is connected to the main control chip through the second resistor, the eighth resistor and the third resistor respectively, and the second resistor, the eighth resistor and the third resistor constitute a lamp bead driving circuit.

[0009] Preferably, the main control chip is also provided with a signal conditioning circuit, and the signal conditioning circuit includes a first diode and a second diode, the positive pole of the first diode is connected to the positive pole of the second diode and is connected to the main control chip through a fourteenth resistor, the negative pole of the second diode is connected to the main control chip, the negative pole of the first diode is grounded through a third capacitor, and the negative pole of the first diode is also connected to the main control chip through a seventh resistor.

[0010] Due to the adoption of the above-mentioned scheme, the utility model relies on the time-sharing emission of multiple monochromatic lights to the surface of the object, allowing multiple colors to be alternately irradiated, and the reflectivity fed back by the alternating illumination of multiple colors of light is corrected multiple times, thereby avoiding detection errors; at the same time, the peripheral circuit of the main control chip is composed of a signal amplification circuit, a lamp bead driving circuit and a signal conditioning circuit to process the feedback signal, thereby improving the accuracy of the signal, further avoiding detection errors, and improving the detection stability as a color mark sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structural principle of an embodiment of the present utility model.

[0012] Figure 2 It is a schematic diagram of the circuit structure of an embodiment of the present utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0015] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0016] like Figure 1 and Figure 2 As shown, this embodiment provides a new color mark sensor, including three-color lamp beads, a main control chip, a lamp bead driving circuit, a signal amplification circuit, a photosensor, and an optical system. The three-color lamp beads are connected to the main control chip via the lamp bead driving circuit, and the photosensor is connected to the main control chip via the signal amplification circuit. The optical system is placed between the three-color lamp beads and the photosensor. The optical system is used to guide the light emitted by the three-color lamp beads and the reflected light. The three-color lamp beads are lamp beads that can emit three monochromatic lights: red, blue, and green. The three-color lamp beads have three different colors built in, and each lamp bead is connected to the main control chip via a second resistor R2, an eighth resistor R8, and a third resistor R3. The second resistor R2, the eighth resistor R8, and the third resistor R3 constitute the lamp bead driving circuit.

[0017] When this embodiment is used, three colors of light are generally used, namely the three primary colors, such as red, blue, and green. Therefore, the three-color lamp beads are built with three different colors of lamp beads: red LED, green LED, and blue LED. During detection, several pulses are first emitted to illuminate the red LED, and then the reflected light of the red light is received and detected. After the red LED is extinguished, several pulses are emitted to illuminate the green LED, and then the reflected light of the green light is received and detected. After the green LED is extinguished, several pulses are emitted to illuminate the blue LED, and then the reflected light of the blue light is received and detected. This process is repeated. The number of pulses emitted is not limited, and the order in which the different light colors are emitted is not limited.

[0018] For a better understanding, the reflectivity of red, blue and green light is regularized based on the four kinds of light, as shown in the following table:

[0019] Red light Blu-ray Green Light White light A 90% reflectivity 50% reflectivity 50% reflectivity 90% reflectivity B 50% reflectivity 90% reflectivity 50% reflectivity 90% reflectivity C 50% reflectivity 50% reflectivity 90% reflectivity 90% reflectivity D 90% reflectivity 90% reflectivity 90% reflectivity 90% reflectivity

[0020] Assume that red light is emitted first, and the reflected light is received for detection. Then, a second light type, let's say blue light, is emitted, and the reflected light is received for detection. Finally, green light is emitted, and the reflected light is received for detection. Based on the different reflectivity combinations for red, blue, and green light, it's easy to distinguish different colors. To use it, simply sample the color you want to locate. For example, sample color A first. Then, any color with a reflectivity of 90% for red light, 50% for blue light, and 50% for green light is identified as color A. The corresponding voltage level is output. In actual designs, 90% and 50% are not unique values, but rather ranges. The same method can be used to identify other colors.

[0021] The peripheral circuits for the main control chip are as follows:

[0022] The signal amplification circuit of this embodiment includes a fifth capacitor C5 and a sixth capacitor C6. The sixth capacitor C6 is connected to the power supply through the fifth resistor R5. The connection point between the sixth capacitor C6 and the fifth resistor R5 is connected to the positive electrode of the photosensitive device. The negative electrode of the photosensitive device is grounded through the first resistor R1 and connected to one end of the fifth capacitor C5. The other end of the fifth capacitor C5 is connected to the main control chip and is connected to the sixteenth resistor R16. The other end of the sixteenth resistor R16 is grounded through the fourth resistor R4 and the seventh capacitor C7 and is connected to the power supply through the fifteenth resistor R15.

[0023] The main control chip of this embodiment is further provided with a signal conditioning circuit, which includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected to the anode of the second diode D2 and is connected to the main control chip through a fourteenth resistor R14. The cathode of the second diode D2 is connected to the main control chip. The cathode of the first diode D1 is grounded through a third capacitor C3. The cathode of the first diode D1 is also connected to the main control chip through a seventh resistor R7.

[0024] Among them, the specific circuit structure is as follows Figure 2 As shown,

[0025] In the picture:

[0026] First, U1 is the main control chip, which includes an amplifier and A / D converter. Model N32L402CBL7 is recommended. U2 is a red, blue, and green LED. U1's pins 46, 2, and 3 sequentially output low levels, driving U2 to emit red, blue, and green light. These three-color lights pass through an optical device and illuminate the color mark being detected. The color mark reflects these three-color lights, which then pass through the optical system and illuminate the photosensor.

[0027] 2. LED1 is a photosensor. The fifth resistor R5 and the sixth capacitor C6 provide a voltage bias for the photosensor. When the photosensor receives reflected light, an induced current is generated. The induced current flows through the first resistor R1 and is converted into an induced voltage. The induced voltage is coupled to the input of the amplifier in the main control chip via the fifth capacitor C5. The fourth resistor R4, the fifteenth resistor R15, the sixteenth resistor R16, and the seventh capacitor C7 form the input bias circuit of the amplifier, providing an appropriate operating point for the amplifier.

[0028] Third, the amplified signal is output from pin 16 of U1. It passes through a signal selection network consisting of resistor R14, diode D1, and diode D2. Software-aided, this selects the useful signal and filters out interference. Capacitor C13 acts as a signal-holding capacitor, maintaining a stable signal during A / D conversion. The analog signal is then input to pin 18 of U1 for A / D conversion.

[0029] 4. After the A / D inside the main control chip, a digital signal is obtained. After being processed by the internal program of the chip, a relatively stable digital value is obtained. Compared with the pre-sampled value, if the digital values of red light, blue light, and green light are the same as the sampled values within a certain error range, it is judged that the color mark is the color to be found, and there will be a level change at the output end. Otherwise, the output level remains unchanged.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new color mark sensor, characterized by: The invention comprises three-color lamp beads, a main control chip, a lamp bead driving circuit, a signal amplifying circuit, a photosensitive device and an optical system. The three-color lamp beads are connected to the main control chip through the lamp bead driving circuit, the photosensitive device is connected to the main control chip through the signal amplifying circuit, and the optical system is placed between the three-color lamp beads and the photosensitive device. The optical system is used to guide the light emitted by the three-color lamp beads and the reflected light. The three-color lamp beads can emit three monochromatic lights: red, blue and green.

2. A novel color mark sensor according to claim 1, characterized in that: The signal amplification circuit includes a fifth capacitor and a sixth capacitor, the sixth capacitor is connected to the power supply through the fifth resistor, the connection point between the sixth capacitor and the fifth resistor is connected to the positive electrode of the photosensitive device, the negative electrode of the photosensitive device is grounded through the first resistor and connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the main control chip and is connected to the sixteenth resistor, the other end of the sixteenth resistor is grounded through the fourth resistor and the seventh capacitor, and is connected to the power supply through the fifteenth resistor.

3. The novel color mark sensor according to claim 1, characterized in that: The three-color lamp bead has three different colors of lamp beads built in. Each lamp bead is connected to the main control chip through the second resistor, the eighth resistor and the third resistor respectively. The second resistor, the eighth resistor and the third resistor constitute a lamp bead driving circuit.

4. The novel color mark sensor according to claim 1, characterized in that: The main control chip is also provided with a signal conditioning circuit, which includes a first diode and a second diode. The anode of the first diode is connected to the anode of the second diode and is connected to the main control chip through a fourteenth resistor. The cathode of the second diode is connected to the main control chip. The cathode of the first diode is grounded through a third capacitor. The cathode of the first diode is also connected to the main control chip through a seventh resistor.

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