CN1115583C - optical scanner - Google Patents

Abstract

An optical scanner able to control the power supply of cold-cathode lamp tube based on its application state is composed of a scanning module for scanning a document to generate relative image signals, a cold-cathode lamp tube for providing the light needed by scanning the document, a power supply for supplying power to the cold-cathode lamp tube, and a control circuit including a timer circuit for controlling the operation of scanner. Therefore, an effective power saving method is provided in a mode of controlling the power supply time, and the warm-up time required for the scanner to enter the working state from the stagnation state can be shortened. In addition, the manufacturing process is simpler and the cost is lower.

Description

Optical scanner

The present invention system provides a kind of optical scanner, refers to a kind of optical scanner that can control the power supply supply of cold cathode fluorescent lamp according to user mode especially.

General optical scanner can be controlled the power supply supply of its light source according to user mode, to save electric power.Power control method as the cold cathode fluorescent lamp of the optical profile type scanner of No. the 283818th, patent gazette bulletin is, when scanner is in running order, the power supply supply of cold cathode fluorescent lamp is to maintain a high voltage with scanning document, and when scanner was in stagnation (idle) state, the power supply supply of cold cathode fluorescent lamp was to maintain a low-voltage to save electric power.

Please refer to Fig. 1, Fig. 1 is the functional-block diagram of known optical scanner 10.Optical scanner 10 includes a signal control device 12, warming-up power supply generator 14, and a cold cathode fluorescent lamp 16.Signal control device 12 is a digital/analog converter (D/A converter).Different digital controlled signals can be exported different magnitudes of voltage to warming-up power supply generator 14 via the output terminal 13 of signal control device 12 again via input end 11 input signal control device 12.Warming-up power supply generator 14 includes an operational amplifier 18, one Darlingtons (darlington) transistor 19, and an ac/dc booster circuit 20.After the different magnitude of voltage input warming-up power supply generators 14, via the running of operational amplifier 18 and Darlington transistor 19, can produce a warming-up DC voltage 15, its magnitude of voltage is promptly represented the warm-up period of cold cathode fluorescent lamp 16.When cold cathode fluorescent lamp 16 was in warm-up mode, its power supply supply was to maintain a low-voltage to save electric power.

Please refer to Fig. 2, Fig. 2 is the contrast relationship figure of the warm-up period of the digital controlled signal of Fig. 1 optical scanner 10 and cold cathode fluorescent lamp 16.When the user must stop the use of optical scanner 10 for some reason, the user can select suitable warm-up period.As shown in Figure 2, when the digital controlled signal of importing from the input end 11 of signal control device 12 was 110, cold cathode fluorescent lamp 16 required warm-up periods were 5 seconds, and when digital controlled signal was 000, cold cathode fluorescent lamp 16 required warm-up periods were 180 seconds.

Yet the processing procedure of known optical scanner 10 is rather complicated, and cost is also comparatively high.The user must select suitable warm-up period according to the time length that will stop using scanner 10, if can't accurately estimate the withdraw from service time, will cause the time of warming-up too short or long, and cause the overlong time of the waste or the wait of power supply.

Therefore, fundamental purpose of the present invention is to provide a kind of optical scanner, and its controllable power device is saved power supply to the power supply supply time of cold cathode fluorescent lamp, and can be to cold cathode fluorescent lamp Rapid Thermal machine.

A kind of optical scanner provided by the invention, this optical scanner includes: the one scan module is used for a file is scanned to produce corresponding image signal; One cold cathode fluorescent lamp, required light when being used for supplying this document scanning; One supply unit is used for providing power supply to this cold cathode fluorescent lamp; And a control circuit, it comprises a timing circuit, is used for controlling the operation of this scanner; Wherein when this scanning module is in the state of a stagnation, this control circuit can be controlled the power-on time of this supply unit to this each power-up period of cold cathode fluorescent lamp, reduce power supply supply, this cold cathode fluorescent lamp is maintained in the state of a preheating to shorten this cold cathode fluorescent lamp required hot machine time when beginning to scan this cold cathode fluorescent lamp.

Wherein, this control circuit comprises a timer.

Brief Description Of Drawings

Fig. 1 is the functional-block diagram of known optical scanner;

Fig. 2 is the contrast relationship figure of the warm-up period of the digital controlled signal of Fig. 1 optical scanner and cold cathode fluorescent lamp 16;

Fig. 3 is the functional-block diagram of optical scanner of the present invention;

Fig. 4 is the power supply timing figure of Fig. 3 supply unit to cold cathode fluorescent lamp.

Please refer to Fig. 3, Fig. 3 is the functional-block diagram of optical scanner 20 of the present invention.Optical scanner 20 includes one scan module 22, be used for a file is scanned to produce corresponding image signal, one cold cathode fluorescent lamp 24, be located in the scanning module 22, required light when being used for supplying this document scanning, a supply unit 26 is used for providing power supply to cold cathode fluorescent lamp 24, and a control circuit 28, be used for the operation of gated sweep device 20.

Control circuit 28 includes a timing circuit 32.When scanner 20 was in running order, the power supply supply that control circuit 28 can 26 pairs of cold cathode fluorescent lamp 24 of control supply units made it maintain a default voltage with scanning document.When the user stops scanner 20, timing circuit 32 can pick up counting and reduce the power-on time (duty cycle) of each power-up period of 26 pairs of cold cathode fluorescent lamp 24 of supply unit according to a default power-saving control pattern, to reduce power supply supply, cold cathode fluorescent lamp 24 is maintained in the state of preheating to shorten cold cathode fluorescent lamp 24 required hot machine time when beginning to scan to cold cathode fluorescent lamp 24.

Please refer to Fig. 4, Fig. 4 is the power supply timing figure of 26 pairs of cold cathode fluorescent lamp 24 of supply unit.The control principle of power-saving control mode 34 is when the user stops using 20 a period of time of scanner t1, supply unit 26 can reduce the power-on time to cold cathode fluorescent lamp 24 each power-up period, make it enter wait (standby) state, and the power-on time of each power-up period (duty cycle) is about 66.6% (first percentage value).If again when t2 scanner 20 still is not used after a while, supply unit 26 can further reduce the time to the power supply supply of cold cathode fluorescent lamp 24, make it enter pause (suspend) state, and the power-on time of each power-up period (duty cycle) is about 30% (second percentage value).If when at last having crossed a period of time t3 scanner 20 and still not being used, supply unit 26 can stop the power supply supply to cold cathode fluorescent lamp 24 fully.When the user reused scanner 20, supply unit 26 can supply cold cathode fluorescent lamp 24 required voltage more again, makes scanner 20 revert to user mode.The cold cathode fluorescent lamp needed time of 24 hot machines decides on the state before the hot machine, and it is of a specified duration more normally to pause, and the needed time of hot machine is also just long more.

Compared to known optical scanner 10, the supply unit 26 of optical scanner 20 of the present invention can reduce the power-on time to cold cathode fluorescent lamp 24 each power-up period.In each power-up period, when supply unit 26 power supplies, supply voltage system remains on the V volt, and when supply unit 26 is no longer powered, supply voltage can be reduced to 0V, therefore scanner 20 provides a kind of effective electricity saving method in the mode of control power-on time, and can shorten scanner 20 and enter the required hot machine time of duty from dead state.In addition, the processing procedure of optical scanner 20 of the present invention is comparatively simple, so cost is also comparatively cheap.

The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.

Claims (3)

1. An optical scanner, characterized in that the optical scanner includes: A scanning module, used to scan a document to generate a corresponding image signal; A cold-cathode lamp for supplying the light required for scanning the document; a power supply device for providing power to the cold cathode lamp; and a control circuit including a timing circuit for controlling the operation of the scanner; Wherein when the scanning module is in a stagnant state, the control circuit will control the power supply time of the power supply device for each power supply cycle of the cold cathode lamp to reduce the power supply to the cold cathode lamp, so that the cold cathode lamp The cathode lamp can be maintained in a preheated state to shorten the warm-up time required for the cold cathode lamp to start scanning. 2. The optical scanner according to claim 1, wherein the control circuit controls the power supply of the power supply device to the cold cathode lamp according to a preset power-saving control mode; the power-saving control mode is when When the user stops using the scanner for a period of time t1, the power supply device reduces the power supply time for each power supply cycle of the cold cathode lamp, making it enter a waiting state, and the power supply time of each power supply cycle is the first percentage value. If the t2 scanner is still not used after a period of time, the power supply device will further reduce the power supply time to the cold cathode lamp, making it enter a standstill state, and the power supply time of each power supply cycle is less than one hundred The second percentile value of the score. Finally, if the t3 scanner is still not used after a period of time, the power supply device will completely stop the power supply to the cold cathode lamp. When the user resumes using the scanner, the power supply unit supplies the voltage required by the cold cathode lamp again, so that the scanner is restored to the use state. 3. The optical scanner according to claim 2, wherein the control circuit includes a timer and the timing circuit is electrically connected to the timer, and when the user stops using the scanner, the timing circuit will start the The timer starts timing and reduces the power supply of the power supply device to the CCFL according to the power saving control mode.

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