CN100441062C - Method and device for shortening heating time of lamp tube - Google Patents

Abstract

A method for shortening the heating time of lamp tube features that the light-emitting module can be quickly activated to be used as the compensating light source of Cold Cathode Fluorescent Lamp (CCFL) to shorten the scan activation time.

Description

Method and device for shortening lamp tube heating time

technical field

The invention relates to a method and a device for shortening the heating time of a lamp tube of a scanner, in particular to a method and a device for compensating a light source which can shorten the scanning activation time.

Background technique

Generally, when a scanner is in operation, a light source is needed to irradiate the document to be scanned, so that the optical image detection module (such as: CCD) of the scanner can obtain the image data of the scanned document.

It can be seen that the quality of the light source is the basis for the scanning quality of the scanner. Therefore, scanner manufacturers in this field all focus on the design and research of the scanner light source.

In addition, due to the high brightness of the light source required by the scanner, most scanner manufacturers use cold cathode fluorescent lamps (cold cathode fluorescent lamps, CCFL). When CCFLs are used, in order to take into account the quality of the light source, it is necessary to wait until the CCFL reaches a certain temperature before the scanner starts to operate. In this way, the light source emitted by the CCFL will be stable. Therefore, a general scanner must consume some warm-up time to make the cold-cathode fluorescent lamp hot enough when the scanner is turned on, so that the cold-cathode fluorescent lamp can emit light stably after being heated. Characteristic graph of heating time versus luminance.

For now, because the cold-cathode fluorescent lamp takes about 90 seconds of heating (warmup) time, consumers have a lot of complaints. Therefore, the manufacturers of scanners tend to develop technologies that reduce the heating time to eliminate consumers' warmup time. dissatisfied.

Therefore, someone has developed a rapid heating method for cold cathode fluorescent lamps, such as US Patent No. 5907742, which adopts a dual-input voltage control method. That is, when heating, a higher input voltage (about 12 volts) is used to rapidly increase the temperature of the cold cathode fluorescent lamp to reach the working temperature earlier, and then a lower input voltage (about 8 volts) is used after heating. Although this method can reduce the heating time of the CCFL to about 30 seconds, it is easy to make the CCFL bear a high current during the heating time to heat up quickly, resulting in a shortened life of the CCFL.

Secondly, in order to achieve two different input voltages (heating period and working period), it uses a pulse width modulation control circuit to control the input voltage, which is relatively complicated in circuit design.

In addition, this patent uses a built-in frequency oscillator in the inverter, and its oscillation frequency will drift indefinitely under different voltages and temperatures, about 35-45KHz. In this way, there will be unstable lighting conditions. This will affect the scanning quality.

Another method of rapid heating is to install a heating wire outside the cold cathode fluorescent lamp. This method of winding the heating wire outside the cold cathode fluorescent lamp is to use the heat of the heating wire outside the lamp tube to force the temperature of the lamp tube to rise. In order to achieve the purpose of rapid heating. Although this method can also achieve the purpose of rapid heating, but because the electric heating wire must be installed outside the lamp tube, some steps are added in the production process;

Secondly, adding heating wires will also increase additional costs, including equipment costs and power consumption costs. The most serious problem is that the heating wires outside the lamp tube will block the light, and then reduce the luminosity of the cold cathode fluorescent lamp. Unevenness affects the quality of the scan.

It can be seen that the current rapid heating method for cold cathode fluorescent lamps has its limitations and problems. Therefore, the inventors have developed this invention which is different from the above-mentioned methods by using scientific techniques.

Contents of the invention

The object of the present invention is to provide a method and its device for shortening the heating time of the lamp tube. The method and its device can utilize the characteristics of the fast activation of the light-emitting component as the compensation light source of the cold-cathode fluorescent lamp, so as to shorten the scanning activation time.

In order to achieve the above object, the method for shortening the heating time of the lamp tube provided by the present invention is to utilize the characteristics of the fast activation of the light-emitting component as a compensation light source for a cold cathode fluorescent lamp (CCFL), and shorten the scanning activation time, which includes the following steps:

a. Simultaneously light the cold cathode fluorescent lamp and the light-emitting component, and use the light-emitting component to compensate the brightness of the cold-cathode fluorescent lamp when it is not stable; and

b. As the waiting time increases, the current supplied to the light-emitting component is adjusted according to the brightness of the cold-cathode fluorescent lamp, so that the light source irradiated on the document surface remains stable.

In the method for shortening the heating time of the lamp tube, the light source of the light-emitting component is taken from a light-emitting diode.

In the method for shortening the heating time of the lamp tube, the light source of the light-emitting component is taken from the light source emitted by the light-emitting diode and projected to the light-guiding component for transmission.

In the method for shortening the heating time of the lamp tube, in step b, the current supplied to the light-emitting component is adjusted according to the brightness of the cold-cathode fluorescent lamp. component current.

The method for shortening the heating time of the lamp tube provided by the present invention is to use the characteristics of the light-emitting component to be quickly activated as a compensation light source for the cold-cathode tube fluorescent lamp to shorten the scanning activation time, which may also include the following steps:

Simultaneously light the cold cathode fluorescent lamp and the light-emitting component, and use the light-emitting component to compensate the brightness of the cold-cathode fluorescent lamp when it is not stable;

Detect the overall light source intensity;

Judging the amount of current required by the light-emitting component according to the test result;

The amount of current input by the light-emitting component is changed to achieve the required amount of current, so that the light source irradiated on the document surface remains stable.

In the method for shortening the heating time of the lamp tube, the light source of the light-emitting component is taken from a light-emitting diode.

In the method for shortening the heating time of the lamp tube, the light source of the light-emitting component is taken from the light source emitted by the light-emitting diode and projected to the light-guiding component for transmission.

In the method for shortening the heating time of the lamp tube, a light sensor is used to detect the intensity of the overall light source.

In order to achieve the above object, the present invention simultaneously provides a device for shortening the heating time of the lamp tube, which includes:

an image detection module;

a cold cathode fluorescent lamp arranged on one side of the image detection module; and

A plurality of light-emitting components are arranged on the other side of the image sensing module, so as to shorten the scan activation time as the compensation light source of the CCFL while being activated with the CCFL.

In the device for shortening the heating time of the lamp tube, the light-emitting component is a light-emitting diode; and

A light sensor is used to detect the intensity of the overall light source to adjust the current supplied to the plurality of light emitting components so that the overall light source remains stable, wherein the overall light source includes the cold cathode fluorescent lamp and the plurality of light emitting components.

The device for shortening the heating time of the lamp tube provided by the present invention may also include:

an image detection module;

a cold cathode fluorescent lamp arranged on one side of the image detection module; and

A light guide component is arranged on the other side of the image detection module, and a light emitting component is arranged on the side of the light guide component; and

A light sensor is used to detect the intensity of the overall light source to adjust the current supplied to the plurality of light emitting components so that the overall light source remains stable, wherein the overall light source includes the cold cathode fluorescent lamp and the plurality of light emitting components;

Therefore, when the light-emitting components and the cold-cathode fluorescent lamps are activated, the plurality of light-emitting components are used as compensation light sources for the cold-cathode fluorescent lamps, thereby shortening the scanning activation time.

In the device for shortening the heating time of the lamp tube, the light guide component is a light guide plate.

In the device for shortening the heating time of the lamp tube, the light-emitting component is a light-emitting diode.

In other words, the hardware structure of the present invention is that one side of the image detection module of the scanner is provided with a cold-cathode fluorescent lamp, and the other side is provided with a light-emitting diode, so that when it and the cold-cathode fluorescent lamp are activated, the light-emitting diode can be used to The feature of rapid activation, as a compensation light source for cold cathode fluorescent lamps, greatly shortens the activation time of the first scan.

The beneficial effect of the present invention is that the fast activation characteristic of the light-emitting component can be used as the compensation light source of the cold-cathode fluorescent lamp to shorten the scanning activation time.

Description of drawings

Fig. 1 is a characteristic curve diagram of heating time versus luminance of a cold cathode fluorescent lamp;

Fig. 2 is a top view structural representation of an embodiment of the present invention;

Fig. 3 is the control flowchart of an embodiment of the present invention;

Fig. 4 is the control flowchart of another embodiment of the present invention;

Fig. 5 is a schematic top view of another embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1-Image detection module 2-Cold cathode fluorescent lamp 3-Light emitting diode 4-Light guide component

Detailed ways

As shown in FIG. 2, one embodiment of the present invention is provided with a cold cathode fluorescent lamp 2 on one side of the image detection module 1 of a scanner for illuminating light onto a document reading position, while the other side is provided with There are a plurality of light emitting diodes 3, because the light emitting diodes 3 have the characteristics of fast activation, so they can be used as the compensation light source of the cold cathode fluorescent lamp 2 while being activated with the cold cathode fluorescent lamp 2, so that the first activation time is greatly shortened , and the brightness of the overall light source can be detected by a light sensor, the light sensor is connected to a control circuit (not shown), in order to cooperate with the operation of its program, according to the brightness of the cold cathode fluorescent lamp 2, to adjust the supply of light The current of the diode 3 keeps the light source irradiated on the document surface in a stable state.

As shown in FIG. 3 , an embodiment of the present invention is to cooperate with the program operation of the control circuit according to the aforementioned structure to realize the method of shortening the scanning activation time, which includes the following steps:

a. Simultaneously light the cold cathode fluorescent lamp and the light-emitting diode, and use the light-emitting diode to compensate the brightness of the cold cathode fluorescent lamp when it is not stable;

b. When the waiting time increases, adjust the current supplied to the light-emitting diode according to the brightness of the cold-cathode fluorescent lamp to keep the light source irradiated on the document surface stable, wherein the current supplied to the light-emitting diode is adjusted according to the brightness of the cold-cathode fluorescent lamp, which is based on the cold-cathode fluorescent lamp The brightness of the fluorescent lamp is increased after being activated, and the current of the light-emitting diode is relatively reduced and controlled.

As shown in FIG. 4, another embodiment of the present invention is also a method for shortening the scanning activation time according to the aforementioned structure and the program operation of the control circuit, which includes the following steps:

a. Simultaneously light the cold cathode fluorescent lamp and the light-emitting diode, and use the light-emitting diode to compensate the brightness of the cold cathode fluorescent lamp when it is not stable;

b. Detecting the overall light source intensity is carried out by using a light sensor;

c. Judging the amount of current required by the LED according to the test results; and

d. Change the amount of current input by the light-emitting diode to achieve the required amount of current, so that the light source irradiated on the document surface remains stable.

The plurality of light emitting diodes mentioned above in the present invention can also be replaced by a light guide assembly and the light emitting diodes on its side. As shown in FIG. , so as to compensate the light source for the cold cathode fluorescent lamp 2, so that the activation time of the first scan is shortened, the waiting time is increased, and then according to the brightness increase after the cold cathode fluorescent lamp 2 is activated, the current of the light emitting diode 3' is relatively reduced and controlled, and Keep the light source irradiated on the document surface in a stable condition.

The above description is only the best specific embodiment of the present invention, but the features of the present invention are not limited thereto, and any changes or modifications that can be easily conceived by those skilled in the art within the field of the present invention can be covered. within the scope of the present invention.

Claims (13)

1, a kind of fluorescent tube method of heating time that shortens, it is characterized in that: this method is a characteristic of utilizing luminescence component to be activated fast, with as the compensatory light of cold-cathode fluorescence lamp and shorten the scanning activationary time, it comprises the following step:

A, light cold-cathode fluorescence lamp and luminescence component simultaneously, compensate this cold-cathode fluorescence lamp with this luminescence component and do not reach brightness when stablizing; And

B, the time for the treatment of increase, and adjust the electric current of supplying with this luminescence component according to the brightness of this cold-cathode fluorescence lamp, make to shine in the light source of file face to keep stable.

2, the method for shortening fluorescent tube as claimed in claim 1 heating time, it is characterized in that: the light source of this luminescence component is taken from light-emitting diode.

3, the method for shortening fluorescent tube as claimed in claim 1 heating time is characterized in that: the light source of this luminescence component is taken from the light source projects that light-emitting diode sends and is transmitted to leaded light component.

4, the method for shortening fluorescent tube as claimed in claim 1 heating time, it is characterized in that: adjust the electric current of supplying with this luminescence component according to the brightness of this cold-cathode fluorescence lamp among the step b, be the increase of the brightness after being activated according to this cold-cathode fluorescence lamp, reduce and control the electric current of this luminescence component relatively.

5, a kind of fluorescent tube method of heating time that shortens, it is characterized in that: this method is a characteristic of utilizing luminescence component to be activated fast, as the compensatory light of cold-cathode fluorescence lamp, to shorten the scanning activationary time, it comprises the following step:

Light cold-cathode fluorescence lamp and luminescence component simultaneously, compensate this cold-cathode fluorescence lamp with this luminescence component and do not reach brightness when stablizing;

Detect integrated light source intensity;

Judge the magnitude of current that this luminescence component is required according to testing result;

Change the magnitude of current of this luminescence component input, keep stable to reach the required magnitude of current, to make to shine in the light source of file face.

6, the method for shortening fluorescent tube as claimed in claim 5 heating time, it is characterized in that: the light source of this luminescence component is taken from light-emitting diode.

7, the method for shortening fluorescent tube as claimed in claim 5 heating time is characterized in that: the light source of this luminescence component is taken from the light source projects that light-emitting diode sends and is transmitted to leaded light component.

8, the method for shortening fluorescent tube as claimed in claim 5 heating time, it is characterized in that: the work that detects integrated light source intensity is to use an optical sensor to carry out.

9, a kind of fluorescent tube device of heating time that shortens, it is characterized in that: this device comprises:

One image detection module;

One cold-cathode fluorescence lamp is located at a side of image detection module; And

A plurality of luminescence components are located at the in addition side of image detection module, so as to when itself and cold-cathode fluorescence lamp are activated, as the compensatory light of cold-cathode fluorescence lamp, scan activationary time and shorten; And

One optical sensor in order to detect the intensity of integrated light source, to adjust the electric current of supplying with described a plurality of luminescence components, makes integrated light source keep stable, and wherein this integrated light source comprises this cold-cathode fluorescence lamp and these a plurality of luminescence components.

10, the device of shortening fluorescent tube as claimed in claim 9 heating time, it is characterized in that: luminescence component is a light-emitting diode.

11, a kind of fluorescent tube device of heating time that shortens, it is characterized in that: this device comprises:

One image detection module;

One cold-cathode fluorescence lamp is located at a side of image detection module; And

One leaded light component is located at the in addition side of image detection module, and the side of this leaded light component is provided with luminescence component; And

One optical sensor in order to detect the intensity of integrated light source, to adjust the electric current of supplying with described a plurality of luminescence components, makes integrated light source keep stable, and wherein this integrated light source comprises this cold-cathode fluorescence lamp and these a plurality of luminescence components;

So as to when luminescence component and cold-cathode fluorescence lamp are activated,, and shorten the scanning activationary time by the compensatory light of described a plurality of luminescence components as cold-cathode fluorescence lamp.

12, the device of shortening fluorescent tube as claimed in claim 11 heating time, it is characterized in that: leaded light component is a light guide plate.

13, the device of shortening fluorescent tube as claimed in claim 11 heating time, it is characterized in that: luminescence component is a light-emitting diode.

Images