Metal halogen lamp control system

Abstract

The invention relates to the technical field of metal halogen lamps, and discloses a metal halogen lamp control system which comprises a lamp holder, a halogen lamp tube is installed on the lamp holder, a cold lens is arranged above the halogen lamp tube in a covering mode, the cold lens is in an inverted U shape, the inner side surface roughness Ra of the cold lens is larger than 0.2 micrometer and smaller than 0.8 micrometer, an optical filter is arranged below the halogen lamp tube, and the outer side surface roughness Ra of the cold lens is larger than 0.2 micrometer and smaller than 0.8 micrometer. The optical filter is connected with the lamp holder, and the halogen lamp tube is electrically connected with a power supply control circuit; the power supply control circuit comprises a control module used for outputting a starting control signal with a gradually increased duty ratio, the control module is electrically connected with a power supply driving module used for controlling and adjusting the driving power of the halogen lamp tube according to the starting control signal, and the power supply driving module is electrically connected with the power supply and the halogen lamp tube respectively; while the uniformity of output light is effectively improved, the influence on the service life of the halogen lamp caused by the impact generated at the moment when the power supply is switched on when the halogen lamp is in a cold state is effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of metal halide lamps, and in particular to a metal halide lamp control system. Background Art

[0002] Metal halide lamps are developed from high-pressure mercury lamps and are made of high-purity quartz tubes filled with mercury, argon, gallium iodide, iron iodide and some rare metal halides. The tungsten electrode is sealed with a molybdenum tape to form a circuit, and the metal lamp holder or ceramic lamp holder with a lead is used as the end. Metal halide lamps can have a very fast hardening reaction and can be widely used in film, screen, PCB and board exposure.

[0003] The halogen lamp's lighting process is a heating process. It usually takes more than ten minutes of preheating from cold start to steady state. It can only be used after reaching steady state. We call this stage light source initialization. At the beginning of light source initialization, the halogen lamp will produce a certain impact when it is powered on in cold state, which has a great impact on the service life of the halogen lamp. In addition, the existing metal halide lamp has poor light uniformity, which leads to uneven curing and reduces curing efficiency.

[0004] Application Contents

[0005] The purpose of the present application is to provide a metal halide lamp control system which effectively improves the uniformity of output light while effectively avoiding the impact on the service life of the halogen lamp caused by the instantaneous impact when the power is turned on when the halogen lamp is in a cold state.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A metal halide lamp control system of the present invention comprises a lamp holder, a halogen lamp tube is mounted on the lamp holder, a cold lens is provided above the halogen lamp tube, the cold lens is in an inverted "U" shape, the inner surface roughness Ra of the cold lens is greater than 0.2 microns and less than 0.8 microns, a filter is provided below the halogen lamp tube, the filter is connected to the lamp holder, and the halogen lamp tube is electrically connected to a power control circuit;

[0008] The power control circuit includes a control module for outputting a start-up control signal with a gradually increasing duty cycle. The control module is electrically connected to a power drive module for controlling and adjusting the driving power of the halogen lamp according to the start-up control signal. The power drive module is electrically connected to a power supply and the halogen lamp, respectively.

[0009] Furthermore, the optical filter is a quartz plate, and a limiting groove is provided at one end of the lamp holder connected to the optical filter, and the optical filter is inserted into the limiting groove.

[0010] Further, the power drive module includes a first resistor R1 having one end connected to a power supply, the first resistor R1 being connected in parallel with a first capacitor C1, the other end of the first resistor R1 being connected to a second resistor R2, the first resistor R1 being connected to the power supply at one end connected to a source of a first transistor Q1, the first resistor R1 being connected to the second resistor R2 at one end connected to a gate of the first transistor Q1, the drain of the first transistor Q1 being connected to the halogen lamp tube 2, the second resistor R2 being connected in series with a second transistor Q2, the drain of the second transistor Q2 being connected to the second resistor R2, the gate of the second transistor Q2 being connected in series with a third resistor R3, the gate and source of the second transistor Q2 being respectively connected to two ends of the second capacitor C2, the second capacitor C2 being connected in parallel with a fourth resistor R4, the source of the second transistor Q2 being connected to ground, and the second transistor Q2 being connected to the control module through the third resistor R3.

[0011] Furthermore, a semicircular mounting ring is fixedly connected to the top of the lamp holder, and a plurality of through grooves are provided from the outer ring side to the inner ring side of the mounting ring. The plurality of through grooves are close to one end of the lamp holder and are all oriented toward the center of the mounting ring, and the plurality of through grooves are evenly spaced.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] The cold lens is in an inverted "U" shape, and the surface roughness Ra of the cold lens reflective surface is greater than 0.2 microns and less than 0.8 microns. The arc-shaped reflective surface of the cold lens will produce diffuse reflection, and the diffusely reflected light will irradiate the filter. The physical polarization characteristics of the filter are used to trim the incoming light and output it evenly, thereby effectively improving the uniformity of the output light; the control module receives the halogen lamp lighting instruction and outputs a starting control signal with a gradually increasing duty cycle to the power drive module. The power drive module adjusts the driving power of the halogen lamp tube in real time according to the received starting control signal with a gradually increasing duty cycle, and drives the halogen lamp tube to enter the rated working state, thereby effectively avoiding the impact of the moment when the power is turned on when the halogen lamp is in a cold state on the service life of the halogen lamp; the present invention effectively improves the uniformity of the output light and effectively avoids the impact of the moment when the power is turned on when the halogen lamp is in a cold state on the service life of the halogen lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of this application;

[0016] Figure 2 is a principle block diagram of the power control circuit of the present application;

[0017] Figure 3 It is a cross-sectional view of the overall structural schematic diagram of the present application;

[0018] Figure 4 This is a schematic diagram of the power drive module circuit of the present application.

[0019] Reference numerals: lamp holder 1; halogen lamp tube 2; cold lens 3; filter 4; limiting groove 5; mounting ring 6; through groove 7. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show the layers related to the present invention rather than being drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer may be changed arbitrarily, and the layer layout may also be more complicated.

[0022] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0023] See also Figure 1 and Figure 2 A metal halide lamp control system comprises a lamp holder 1, a halogen lamp tube 2 is mounted on the lamp holder 1, a cold lens 3 is provided above the halogen lamp tube 2, the cold lens 3 is in an inverted "U" shape, the inner surface roughness Ra of the cold lens 3 is greater than 0.2 microns and less than 0.8 microns, a filter 4 is provided below the halogen lamp tube 2, the filter 4 is connected to the lamp holder 1, and the halogen lamp tube 2 is electrically connected to a power control circuit;

[0024] The power control circuit includes a control module for outputting a start-up control signal with a gradually increasing duty cycle. The control module is electrically connected to a power drive module for controlling and adjusting the driving power of the halogen lamp 2 according to the start-up control signal. The power drive module is electrically connected to the power supply and the halogen lamp 2 respectively.

[0025] The cold lens 3 is in an inverted "U" shape, and the surface roughness Ra of the reflective surface of the cold lens 3 is greater than 0.2 microns and less than 0.8 microns. The arc-shaped reflective surface of the cold lens 3 will produce diffuse reflection, and the diffusely reflected light will irradiate the filter 4. The physical polarization characteristics of the filter 4 are used to trim the incoming light and output it evenly, thereby effectively improving the uniformity of the output light; the control module receives the halogen lamp lighting instruction and outputs a starting control signal with a gradually increasing duty cycle to the power drive module. The power drive module adjusts the driving power of the halogen lamp tube 2 in real time according to the received starting control signal with a gradually increasing duty cycle, and drives the halogen lamp tube 2 to enter the rated working state, thereby effectively avoiding the impact of the moment when the power is turned on when the halogen lamp is in a cold state on the service life of the halogen lamp; the present invention effectively improves the uniformity of the output light, and effectively avoids the impact of the moment when the power is turned on when the halogen lamp is in a cold state on the service life of the halogen lamp.

[0026] See also Figure 1 and Figure 3 The filter 4 is a quartz plate, and a limiting groove 5 is provided at one end of the lamp holder 1 connected to the filter 4 , and the filter 4 is inserted into the limiting groove 5 .

[0027] If the quartz plate filter 4 is contaminated, it will directly affect the illumination and illumination distribution. The filter 4 is inserted into the limiting groove 5 to achieve a detachable connection between the filter 4 and the lamp holder 1. When the filter 4 is contaminated, it is convenient to remove the filter 4 for cleaning or replace the filter 4.

[0028] See also Figure 2 and Figure 4The power driving module includes a first resistor R1 connected to a power supply at one end, a first capacitor C1 is connected in parallel to the first resistor R1, a second resistor R2 is connected to the other end of the first resistor R1, one end of the first resistor R1 connected to the power supply is connected to the source of the first transistor Q1, one end of the first resistor R1 connected to the second resistor R2 is connected to the gate of the first transistor Q1, the drain of the first transistor Q1 is connected to the halogen lamp 2, the second resistor R2 is connected in series with a second transistor Q2, the drain of the second transistor Q2 is connected to the second resistor R2, the gate of the second transistor Q2 is connected in series with a third resistor R3, the gate and source of the second transistor Q2 are respectively connected to the two ends of the second capacitor C2, the second capacitor C2 is connected in parallel with a fourth resistor R4, the source of the second transistor Q2 is connected to the ground, and the second transistor Q2 is connected to the control module through the third resistor R3.

[0029] The first transistor Q1 is a PMOS transistor, and the second transistor Q2 is an NMOS transistor, that is, the first transistor Q1 is turned on when the gate voltage of the first transistor Q1 is lower than the source voltage by a certain voltage value, and the second transistor Q2 is turned on when the gate voltage of the second transistor Q2 is higher than the source voltage by a certain voltage value.

[0030] When the control module receives an instruction to light up the halogen lamp, the control module outputs a high-level signal to the third resistor R3 and inputs the gate of the second transistor Q2 through the third resistor R3 to provide a high-level signal for the gate of the second transistor Q2, controls the second transistor Q2 to be turned on, and the power supply voltage provided by the power supply VCC flows into the ground GND through the first resistor R1, the second resistor R2 and the second transistor Q2;

[0031] When the second transistor Q2 is turned off, the power supply voltage provided by the power supply VCC flows into the gate of the first transistor Q1 after being stepped down by the first resistor R1, and the power supply voltage provided by the power supply VCC directly flows into the source of the first transistor Q1 at the same time. At this time, there is a voltage difference between the gate voltage value of the first transistor Q1 and the source of the first transistor Q1, and the voltage difference is greater than the voltage difference required to turn on the first transistor Q1, so that the first MOS tube Q1 is turned on, and the power supply voltage provided by the power supply VCC can be input to the halogen lamp tube 2 through the first transistor Q1 to provide a driving voltage for the halogen lamp tube 2;

[0032] When the control module inputs a start control signal with a gradually increasing duty cycle to the gate of the second transistor Q2 through the third resistor R3, the second transistor Q2 is turned on only during the duty cycle time in a pulse cycle time. At this time, the power supply VCC can provide the halogen lamp 2 with a power supply voltage during the duty cycle time in a pulse time. As the duty cycle time of the subsequent input cycle pulse time increases, the halogen lamp can be lit with step-by-step buffering, effectively reducing the impact force.

[0033] The fourth resistor R4 and the second capacitor C2 are used to filter the voltage signal input to the second MOS transistor Q2 by the control module.

[0034] See also Figure 1 and Figure 3 A semicircular mounting ring 6 is fixedly connected to the top of the lamp holder 1, and a plurality of through grooves 7 are provided from the outer ring side to the inner ring side of the mounting ring 6. The plurality of through grooves 7 are all oriented toward the center of the mounting ring 6 near one end of the lamp holder 1, and the plurality of through grooves 7 are evenly spaced.

[0035] A plurality of through slots 7 are arranged in an annular array in the mounting ring 6, and the mounting angle can be selected as required to meet the requirements of different curing angles.

[0036] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A metal halide lamp control system, characterized in that: The invention comprises a lamp stand (1), a halogen lamp tube (2) is mounted on the lamp stand (1), a cold lens (3) is provided above the halogen lamp tube (2), the cold lens (3) is in an inverted "U" shape, the inner surface roughness Ra of the cold lens (3) is greater than 0.2 micrometers and less than 0.8 micrometers, a filter (4) is provided below the halogen lamp tube (2), the filter (4) is connected to the lamp stand (1), and the halogen lamp tube (2) is electrically connected to a power control circuit; The power control circuit comprises a control module for outputting a start-up control signal with a gradually increasing duty cycle, the control module being electrically connected to a power drive module for controlling and adjusting the drive power of the halogen lamp (2) according to the start-up control signal, the power drive module being electrically connected to a power source and the halogen lamp (2) respectively.

2. A metal halide lamp control system according to claim 1, characterized in that: The optical filter (4) is a quartz plate, and a limiting groove (5) is provided at one end of the lamp holder (1) connected to the optical filter (4), and the optical filter (4) is inserted into the limiting groove (5).

3. A metal halide lamp control system according to claim 1, characterized in that: The power drive module comprises a first resistor R1 connected to a power source at one end, the first resistor R1 is connected in parallel with a first capacitor C1, the other end of the first resistor R1 is connected to a second resistor R2, the first resistor R1 is connected to the power source at one end and connected to the source of a first transistor Q1, the first resistor R1 is connected to the second resistor R2 at one end and connected to the gate of the first transistor Q1, the drain of the first transistor Q1 is connected to the halogen lamp (2), the second resistor R2 is connected in series with a second transistor Q2, the drain of the second transistor Q2 is connected to the second resistor R2, the gate of the second transistor Q2 is connected in series with a third resistor R3, the gate and source of the second transistor Q2 are respectively connected to two ends of the second capacitor C2, the second capacitor C2 is connected in parallel with a fourth resistor R4, the source of the second transistor Q2 is connected to the ground, and the second transistor Q2 is connected to the control module via the third resistor R3.

4. The metal halide lamp control system according to claim 1, characterized in that: A semicircular mounting ring (6) is fixedly connected to the top of the lamp holder (1), and a plurality of through grooves (7) are provided from the outer ring side to the inner ring side of the mounting ring (6), and the plurality of through grooves (7) are close to one end of the lamp holder (1) and are all oriented toward the center of the mounting ring (6), and the plurality of through grooves (7) are evenly spaced.

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