Zoom type optical signal gain regulator and circuit

Abstract

The invention provides a zoom type optical signal gain regulator and a circuit, the zoom type optical signal gain regulator comprises a support, the support is provided with a light-emitting part, a convex lens, a photoresistor and an adjusting part, the convex lens is arranged between the light-emitting part and the photoresistor, and the adjusting part is arranged between the light-emitting part and the photoresistor. The light emitting part is used for emitting parallel light to the convex lens and irradiating the parallel light on the photoresistor, the adjusting part is used for adjusting the distance between the photoresistor and the convex lens, and the focus of the convex lens is located between the photoresistor and the convex lens. According to the optical principle of focusing of the convex lens, the distance between the photoresistor and the convex lens is precisely changed through the adjusting piece, so that the light intensity irradiated on the photoresistor is continuously changed, the resistance value of the photoresistor is changed smoothly and is wide in range through the adjusting mode based on geometrical optics, stepless continuous gain adjustment is achieved, and the precision of the light intensity is improved. The adjusting precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photoelectric sensing and signal conditioning, in particular to a zoom optical signal gain regulator and circuit. BACKGROUND

[0002] In industrial control, automatic detection, ambient light sensing and various electronic devices, it is often necessary to convert optical signals into electrical signals and adjust the gain (sensitivity). At present, the mainstream way to achieve this adjustment mainly includes electronic adjustment and mechanical adjustment.

[0003] In the electronic adjustment scheme, a fixed configuration photoelectric sensor is usually used in combination with a subsequent programmable amplification circuit or digital potentiometer. By changing the amplification factor of the amplification circuit or adjusting the reference voltage, the output signal gain can be adjusted. However, the circuit is relatively complex, the cost is high, the stability may decrease in harsh industrial environments, and the parameters of electronic components may drift with temperature and time, resulting in changes in the preset gain value, which needs to be calibrated regularly.

[0004] In the mechanical adjustment scheme, the most common method is to directly manually rotate a variable resistor to change the circuit parameters. Although the structure is simple and the anti-interference ability is strong, the potentiometer has problems such as mechanical wear and oxidation of the contact, which affects its service life and long-term reliability, and the linearity and fineness of the adjustment are limited.

[0005] Therefore, whether it is electronic adjustment or traditional mechanical adjustment, there are respective shortcomings, and there is a lack of a device in the prior art that is simple in structure, high in adjustment precision, stable and reliable, and can intuitively and continuously adjust the optical signal gain through physical means. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a zoom optical signal gain regulator and circuit. By using the optical principle of convex lens focusing, the distance between the photosensitive resistor and the convex lens is precisely changed by the adjusting member, thereby continuously changing the light intensity on the photosensitive resistor. This adjustment method based on geometric optics makes the resistance value of the photosensitive resistor change smoothly and widely, realizes stepless continuous gain adjustment, and has high adjustment precision.

[0007] To solve the above technical problems, on the one hand, the present application provides a zoom optical signal gain regulator, comprising a support, a light emitting member, a convex lens, a photosensitive resistor and an adjusting member are arranged on the support, the convex lens is arranged between the light emitting member and the photosensitive resistor, the light emitting member is used to emit parallel light to the convex lens and irradiate on the photosensitive resistor, the adjusting member is used to adjust the distance between the photosensitive resistor and the convex lens, and the focal point of the convex lens is located between the photosensitive resistor and the convex lens.

[0008] In some embodiments, the axis of the light emitting member and the axis of the photoresistor are both coaxial with the main optical axis of the convex lens.

[0009] In some embodiments, the bracket comprises a base on which the light emitting member is fixed, a sliding groove is arranged on the base and is parallel to the main optical axis of the convex lens, and the adjusting member is used to drive the photoresistor or the convex lens to slide along the sliding groove.

[0010] In some embodiments, a sliding frame and a fixing frame are arranged on the base, the bottom of the sliding frame is slidingly arranged in the sliding groove, the top of the sliding frame is threadedly connected with the adjusting member, one end of the adjusting member is rotationally connected with the fixing frame, and the photoresistor or the convex lens is mounted on the sliding frame.

[0011] In some embodiments, the light emitting member is fixed on the fixing frame.

[0012] In some embodiments, the sliding groove is in the shape of a convex letter, the sliding frame comprises a vertical column, a sliding block is arranged at the bottom of the vertical column and is perpendicular to the vertical column, and the sliding block is slidingly arranged in the sliding groove and limits the vertical displacement of the vertical column.

[0013] In some embodiments, two limiting members are arranged in the sliding groove, and the two limiting members are used to limit the moving range of the sliding frame.

[0014] In some embodiments, the adjusting member is controlled by a motor.

[0015] In some embodiments, an outer shell is arranged, the outer shell is sealingly connected with the base, the light emitting member, the convex lens, the photoresistor and the adjusting member are located in the outer shell, and one end of the adjusting member extends out of the outer shell.

[0016] In another aspect, the application provides a circuit comprising the variable gain optical signal amplifier, and the photoresistor is connected into the circuit as a variable resistor.

[0017] The application has the following advantages: 1. The application utilizes the optical principle of the convex lens focusing, precisely changes the distance between the photoresistor and the convex lens through the adjusting member, thereby continuously changes the light intensity irradiated on the photoresistor, the adjusting mode based on geometric optics makes the resistance change of the photoresistor smooth and wide-ranging, realizes stepless continuous gain adjustment, and the adjusting precision is high.

[0018] 2. The application has simple and reliable structure, strong anti-interference ability, and does not need complex electronic amplification circuit or fragile potentiometer contact.

[0019] 3. This invention can be adjusted according to changes in the application environment. For example, when the light source ages due to long-term use, the optical window becomes dusty, or materials with different reflectivity / transmittance need to be detected, the operator does not need to replace the device or modify the circuit program. They only need to fine-tune the adjustment component manually or electrically to quickly and intuitively restore or adjust the system sensitivity to the optimal state. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the zoom-type optical signal gain regulator of the present invention; Figure 2 This is a schematic diagram of the application of the zoom-type optical signal gain regulator of the present invention in a circuit. Figure 3 This is a schematic diagram of the present invention.

[0021] Reference numerals: 1. Base; 11. Carriage; 12. Fixing frame; 13. Lens holder; 2. Light-emitting element; 3. Convex lens; 4. Photoresistor; 5. Adjustment element. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be 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.

[0023] like Figure 1 As shown, this invention provides a zoom-type optical signal gain adjuster, including a bracket. The bracket includes a base 1, a slide 11, a fixing frame 12, and a lens frame 13. The slide 11, fixing frame 12, and lens frame 13 are all mounted on the base 1. The fixing frame 12 and lens frame 13 are fixed to the bracket by welding or bolts. The slide 11 is slidably mounted on the base 1. The lens frame 13 is located between the fixing frame 12 and the slide 11. A convex lens 3 is mounted on the lens frame 13. A light-emitting element 2 is mounted on the fixing frame 12. The light-emitting element 2 is powered by an external power supply and stably emits parallel light to the convex lens 3. A photoresistor 4 is mounted on the slide 11. The parallel light emitted by the light-emitting element 2 is irradiated onto the photoresistor 4 through the convex lens 3. The focal point of the convex lens 3 is located between the photoresistor 4 and the convex lens 3. An adjustment element 5 is provided on the slide 11. The adjustment element 5 is used to adjust the distance between the convex lens 3 and the photoresistor 4, thereby changing the light intensity received by the photoresistor 4 and causing the resistance value of the photoresistor 4 to change.

[0024] It is understandable that, such as Figure 3As shown, when the photosensitive resistor 4 is close to the convex lens 3 (i.e. close to the focal point), the photosensitive resistor 4 receives concentrated light energy, the light intensity increases, and the resistance of the photosensitive resistor 4 decreases. When the photosensitive resistor 4 is away from the convex lens 3 (i.e. away from the focal point), the photosensitive resistor 4 receives dispersed light energy, the light intensity decreases, and the resistance of the photosensitive resistor 4 increases. The continuous change of the resistance of the photosensitive resistor 4 directly changes the output voltage or current in the circuit (such as a voltage dividing circuit or a bridge circuit), thereby achieving gain adjustment of the optical signal to the electrical signal. It can also replace the traditional variable resistor.

[0025] In this embodiment, the axis of the light emitting member 2 and the axis of the photosensitive resistor 4 are coaxial with the main optical axis of the convex lens 3.

[0026] In this embodiment, the slide 11 includes two columns and a crossbeam, the two ends of the crossbeam are fixedly connected to the top of the two columns, the bottom of the column is fixedly provided with a sliding block, the sliding block and the column are perpendicular to each other, two sliding grooves are provided on the base 1, the two sliding grooves are arranged in parallel, the sliding grooves are parallel to the main optical axis of the convex lens 3, the sliding grooves are in the shape of a convex letter, and the sliding block and the bottom of the column are slidingly arranged in the sliding grooves, so that the slide 11 can slide along the sliding grooves. The convex-shaped sliding groove can limit the vertical movement of the sliding block, thereby limiting the vertical movement of the slide 11. Of course, in other embodiments, the slide 11 can be fixed, and the lens holder 13 can be slidingly arranged on the sliding groove, and the same effect can be achieved by adjusting the position of the lens holder 13.

[0027] In this embodiment, two limiting members are arranged in the sliding groove, and the two limiting members are used to limit the movement range of the slide 11. The limiting member can be a baffle or a stopper, which is fixed in the sliding groove by welding or insertion.

[0028] In this embodiment, the adjusting member 5 includes a handle and a screw rod, one end of the screw rod passes through the lens holder 13 and the fixed frame 12 in sequence and is rotatably connected to the lens holder 13 and the fixed frame 12, the other end of the screw rod passes through the crossbeam of the slide 11 and is threadedly connected to the crossbeam, and the handle is installed at the end of the screw rod passing through the crossbeam, so that the screw rod can be manually rotated to adjust the distance between the photosensitive resistor 4 on the slide 11 and the convex lens 3. In other embodiments, the adjusting member 5 can also be controlled by a micro stepping motor or a servo motor to achieve precise fine adjustment.

[0029] In order to avoid the influence of impurities on light, in some embodiments, the zoom optical signal gain adjuster further includes a housing, the housing covers the base 1, the bottom of the housing is sealingly connected to the base 1, the light emitting member 2, the convex lens 3, the photosensitive resistor 4 and the adjusting member 5 are located in the housing, one end of the adjusting member 5 extends out of the housing, and the screw rod of the adjusting member 5 is sealed with the housing by a rotary sealing ring.

[0030] As shown in FIG. 6, the zoom optical signal gain adjuster further includes a light source 6, the light source 6 is arranged on the base 1, and the light emitting member 2 is arranged on the light source 6. The light source 6 can be a light-emitting diode or a laser diode. Figure 2As shown, the application also provides a circuit comprising the zoomable optical signal gain regulator, and the photoresistor 4 is connected into the circuit as a variable resistor. For example, the photoresistor is connected into the circuit of a photographic and stage light, and the intensity of the photographic and stage light is adjusted by manually adjusting the photoresistor 4 through the adjusting member 5.

[0031] In addition, the zoomable optical signal gain regulator can also be installed on a material conveying line, and the moving direction of the material is perpendicular to the main optical axis of the convex lens 3. When the material passes, the material blocks the light beam, so that the resistance of the photoresistor 4 changes, thereby realizing the counting of the material or the detection of the broken material of the conveying belt. When the light source is aged, the distance between the convex lens 3 and the photoresistor 4 can be adjusted through the adjusting member 5, so that the sensitivity of the zoomable optical signal gain regulator returns to the initial state.

[0032] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and 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 application, and should be included in the protection scope of the present application.

Claims

1. A zoom-type optical signal gain adjuster, characterized in that: The device includes a support frame on which a light-emitting element (2), a convex lens (3), a photoresistor (4), and an adjustment element (5) are arranged. The convex lens (3) is arranged between the light-emitting element (2) and the photoresistor (4). The light-emitting element (2) is used to emit parallel light to the convex lens (3) and illuminate the photoresistor (4). The adjustment element (5) is used to adjust the distance between the photoresistor (4) and the convex lens (3). The focal point of the convex lens (3) is located between the photoresistor (4) and the convex lens (3).

2. The zoom-type optical signal gain adjuster according to claim 1, characterized in that: The axis of the light-emitting element (2) and the axis of the photoresistor (4) are both coaxial with the principal optical axis of the convex lens (3).

3. The zoom-type optical signal gain adjuster according to claim 1, characterized in that: The bracket includes a base (1), the light-emitting element (2) is fixed on the base (1), the base (1) is provided with a sliding groove, the sliding groove is parallel to the main optical axis of the convex lens (3), and the adjusting element (5) is used to drive the photoresistor (4) or the convex lens (3) to slide along the sliding groove.

4. The zoom-type optical signal gain adjuster according to claim 3, characterized in that: The base (1) is provided with a slide (11) and a fixed frame (12). The bottom of the slide (11) is slidably disposed in the slide groove. The top of the slide (11) is threadedly connected to the adjusting member (5). One end of the adjusting member (5) is rotatably connected to the fixed frame (12). The photoresistor (4) or the convex lens (3) is installed on the slide (11).

5. The zoom-type optical signal gain adjuster according to claim 4, characterized in that: The light-emitting element (2) is fixed on the mounting bracket (12).

6. The zoom-type optical signal gain adjuster according to claim 4, characterized in that: The slide groove is convex in shape, and the slide (11) includes a column. A slider is provided at the bottom of the column. The slider is perpendicular to the column and is slidably disposed in the slide groove and restricts the vertical displacement of the column.

7. The zoom-type optical signal gain adjuster according to claim 4, characterized in that: Two limiting members are provided in the slide groove, and the two limiting members are used to limit the movement range of the slide (11).

8. The zoom-type optical signal gain regulator according to claim 1, characterized in that: The regulating component (5) is controlled by a motor.

9. The zoom-type optical signal gain regulator according to claim 1, characterized in that: Includes an outer shell, which is sealed to a base (1). The light-emitting element (2), convex lens (3), photoresistor (4), and adjustment element (5) are all located inside the outer shell, with one end of the adjustment element (5) extending out of the outer shell.

10. A circuit, characterized in that: The zoom-type optical signal gain regulator according to any one of claims 1 to 9 is provided, wherein the photoresistor (4) is connected in the circuit as a variable resistor.

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