JPH07105866B2 - Exposure scanning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to an exposure scanning device for exposing and scanning a document image, for example.

(Prior Art) As is well known, an exposure scanning device has been developed which exposes and scans a document image, converts it into an electric signal, and supplies it to, for example, a color printer. This apparatus illuminates a document set on a document table with an exposure light source provided in an exposure scanning unit, receives reflected light from the document with a line sensor such as a CCD, and converts it into an electric signal. .

By the way, the exposure lamp is composed of a fluorescent lamp. This fluorescent lamp requires sufficient warm-up after turning on the power of the device. When this warm-up is not sufficient, the light quantity of the fluorescent lamp is not uniform, and especially the quantity of infrared rays is large. Therefore, when the original is in color, the color of the original cannot be accurately read, which is a problem.

Conventionally, when warming up a fluorescent lamp, when the power of the device is turned on, the heater that keeps the fluorescent lamp warm is turned on,
In this state, the fluorescent lamp was unconditionally turned on for a certain period of time. Therefore, depending on the ambient temperature of the device, warming up may not be performed sufficiently.

(Problems to be Solved by the Invention) The present invention is intended to solve the problem of warm-up control in a light source, and its object is to provide a simple configuration, to accurately, and in a short time, to adjust the light amount of the light source. An object of the present invention is to provide an exposure scanning device that can be stabilized.

[Structure of the Invention] (Means for Solving the Problems) The present invention irradiates a document image with light, and a light source having a stable light amount at the first temperature and a power source being turned on. A heating means for starting heating of the light source; a detecting means for detecting that the temperature of the heating means reaches a second temperature lower than the first temperature; and a heating means for starting heating by the heating means. A timer for measuring a first time until the detection means detects that the temperature of the heating means has reached the second temperature, and a timer for multiplying the first time measured by the timer by a predetermined value. The calculating means for calculating the time of 2 and the detecting means detects that the temperature of the heating means has reached the second temperature, and then the timer sets the second time.
When the time is measured, the control unit determines that the light source is in the light irradiation enabled state.

(Operation) In the present invention, the timer measures the first time after the power is turned on until the heating means reaches the second temperature lower than the first temperature at which the light quantity of the light source stabilizes, and the arithmetic means measures by the timer. The determined first time is multiplied by a predetermined value to obtain the second time. The control means determines that the light source is in the light irradiation enabled state when the timer measures the second time after the detection means detects that the temperature of the heating means has reached the second temperature. Therefore, the time delay of heat conduction from the heating means to the light source can be guaranteed, and the light source can be surely warmed up to a stable temperature within the necessary minimum time.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 shows an exposure scanning apparatus according to the present invention. A document table 12 made of transparent glass is provided on the upper surface of the apparatus body 11, and a scale 13 as a reference for setting documents is provided at one end of the document table 12. In addition, the device body 11
A document cover 14 that covers the document table 12 is provided to be openable and closable, and an operation panel 15 is provided. The operation panel 15 includes a scanning start key 15a for instructing the start of exposure scanning of a document, a ten-key 15b, and a display 15 for performing various displays.
c is provided. Furthermore, on the back side of the platen 12,
A scanner unit for exposing and scanning a document is provided.

In FIG. 7, a carriage 22 that constitutes the scanner unit 21.
Two fluorescent lamps 23 are arranged in parallel on the upper side, and a rod lens array 24 is arranged between the fluorescent lamps 23. At the lower end of the rod lens array 24, a line sensor 25 including a color CCD having a color filter provided at the light receiving portion is provided. The carriage 22 has one end slidably provided on a guide shaft 26 and is attached to a so-called timing belt (toothed belt) 27 stretched along the guide shaft 26. This timing belt
27 is driven by a pulse motor 28. That is, the timing belt 27 is stretched between the motor pulley P ₁ provided on the rotary shaft of the pulse motor 28 and the idle pulley P ₂ , and according to the operation of the timing belt 27, the scanner unit 21 is shown as It is designed to be moved in the b direction. Further, inside the apparatus main body 11, an A / D converter 29 for converting a signal output from the line sensor 25 into a digital signal is provided, and an inverter 31 for driving the fluorescent lamp 23 is provided. Flat cable that supplies output power to fluorescent lamp 23
30 are provided.

Further, the scanner 21 is provided with a heater for keeping the fluorescent lamp 23 heated to a predetermined temperature and a temperature sensor for detecting the temperature of the heater, which is close to the fluorescent lamp 23.
The heater and the temperature sensor will be described later.

FIG. 1 shows the configuration of the control circuit. The sixth
The same parts as those in FIGS. 7 and 7 are designated by the same reference numerals.

In the figure, a main controller 41 controls the entire apparatus, and the main controller 41 is connected to the operation panel 15, the pulse motor 28, a detector 42 including various sensors, and an inverter 31. Has been done. In addition, the heater 43 described above
Is provided with a heater control circuit 45 for controlling the temperature of the heater 43 to a predetermined stable temperature according to the output signal of the temperature sensor 44 that detects the temperature of the heater 43. The output signal of the temperature sensor 44 is also supplied to the main control unit 41, and in the main control unit 41, the supplied heater is supplied.
The warm-up control of the fluorescent lamp 23 is performed based on the temperature information of 43.

In the above configuration, the operation that is the premise of the present invention will be described.

When the power of the apparatus main body 11 is supplied, the main controller 41 operates as shown in FIG.

First, in step ST1, the fluorescent lamp 23 is turned on and the heater 43 is turned on. In step ST2, the timer is reset and the timer starts counting time. In step ST3, based on the temperature information supplied from the temperature sensor 44, it is determined whether or not the temperature of the heater 43 has become equal to or higher than a preset temperature Tb. As a result, if the temperature of the heater 43 has not reached Tb yet, it is determined in step ST4 whether or not the time counted by the timer has exceeded a preset X time. As a result, if the X time has not yet passed, the control shifts to the step ST3, and the above-described operation is performed. Further, when X time has elapsed, the heater 43 or the like is likely to malfunction, and therefore control is transferred from step ST4 to step ST5.
In ST5, an anomaly is displayed on the display 15c of the operation panel 15.

On the other hand, in step ST3, the temperature of the heater 43 is Tb.
If it is determined that the above, the control proceeds to step ST.
Moved to 6. In step ST6, the fluorescent lamp 23 is turned off, and then in step ST7, the operation panel 1
The ready display is displayed on the display 15c of No. 5, and the exposure scanning is enabled.

According to the above operation, when the power is turned on, the fluorescent lamp 23 is turned on, the heater 43 is turned on, and when the temperature of the heater 43 reaches a preset value, the fluorescent lamp 23 is turned off. Ready state. Therefore, the heater 43
Since the completion of warming up of the fluorescent lamp 23 is determined according to the temperature, it is possible to reliably warm up the fluorescent lamp regardless of the temperature of the outside air.

Further, since the completion of warming up of the fluorescent lamp 23 is determined according to the temperature of the heater 43, for example, when the temperature of the outside air is high, or when the power is turned on again immediately after the device power is turned off, The time required for warming up can be shortened.

Further, since the temperature of the heater 43 is detected, the heater 43
It is possible to detect anomalies in, which is practically convenient.

Next, another operation which is a premise of the present invention will be described with reference to FIGS. 3 and 4. The same parts as those in FIG. 2 are designated by the same reference numerals.

FIG. 3 shows that the temperature of the heater 43 has reached a temperature Tb lower than the stable temperature Ta of the heater 43, as shown in FIG. After a lapse of time, a ready display is displayed on the display 15c of the operation panel 15.

That is, if it is determined in step ST3 shown in FIG. 3 that the temperature of the heater 43 has exceeded the stable temperature Tb, the control shifts to step ST11. In step ST11, the timer is reset and the timer starts counting time. In step ST12, the time counted by this timer is preset
It is determined whether or not the Tc time has elapsed, and if the Tc time has elapsed, control is sequentially transferred to steps ST6 and ST7, and the fluorescent lamp
23 is turned off, and a ready display is displayed on the display 15c.

According to the above operation, it is detected that the temperature of the heater 43 has reached the temperature Tb lower than the stable temperature Ta of the heater 43, and the temperature Tb
After a lapse of a certain Tc time from the detection of, the ready display is displayed on the display 15c of the operation panel 15. Therefore, if the temperature of the heater 43 is Tb, the temperature of the fluorescent lamp 23 reaches a predetermined warming-up completion temperature after Tc time, and therefore the error of the circuit components used in the main control circuit 41 and the heater control circuit 45 is increased. Alternatively, it is possible to reliably warm up the fluorescent lamp 23 without being affected by the error in the stable temperature of the heater 43 due to the ambient temperature.

Further, after the time Tc has elapsed since the heater 43 exceeded the temperature Tb, the ready display is made, so that the time delay of heat conduction from the heater 43 to the fluorescent lamp 23 can be taken into consideration,
It is possible to warm up in the minimum necessary time.

FIG. 5 shows an embodiment of the present invention in which the example shown in FIG. 3 is further improved. As shown in FIG. 4 (b),
When the heater 43 counts the time until the temperature reaches Tb lower than the stable temperature Ta, and the heater 43 reaches the temperature Tb, after a lapse of a predetermined number of times until the temperature reaches the stable temperature Tb, the display unit
It is designed to display a ready display on 15c.

That is, when the temperature of the heater 43 exceeds Tb in step ST3 shown in FIG. 3, the heater is heated in step ST21.
The time TM counted until 43 reaches the temperature Tb is stored in the storage area TMX. After that, in step ST22, the timer is reset again, and in step ST23, the time stored in the storage area TMX is multiplied by a predetermined value C, and this value is stored in the storage area TMR. And
In steps ST24 and ST25, the timer is counted again and it is determined whether or not the count value TM has reached the time stored in the storage area TMR. As a result, when the counted time TM reaches the time stored in the storage area TMR, the control is sequentially shifted to steps ST6 and ST7, the fluorescent lamp is turned off, and the ready display is displayed on the display 15c. Be seen.

The same effect can be obtained by the above embodiment. Moreover, in this embodiment, since the ready display is performed after a predetermined time which is a time required for the heater 43 to reach the temperature Tb lower than the stable temperature Ta, the fluorescent lamp is emitted from the heater 43. Since the time delay of heat conduction to 23 and the influence of ambient temperature can be taken into consideration, it is possible to perform the warm-up of the fluorescent lamp more reliably and in a short time.

In the above embodiment, the present invention is applied to reading an original image,
The case where the present invention is applied to the exposure scanning device that outputs as a digital signal has been described, but the present invention is not limited to this, and the present invention can also be applied to a copying machine or the like.

Of course, various modifications can be made without departing from the scope of the invention.

[Effect of the Invention] As described above in detail, according to the present invention, after the power source is turned on, the timer reaches the first temperature until the heating unit reaches the second temperature lower than the first temperature at which the light amount of the light source stabilizes. Measure time,
The calculating means obtains the second time by multiplying the first time measured by the timer by a predetermined value. The control means detects that the temperature of the heating means has reached the second temperature by the detecting means,
When the timer measures the second time, it is determined that the light source is in the light irradiation enabled state. Therefore, the time delay of heat conduction from the heating means to the light source can be guaranteed, and the light source can be surely warmed up to a stable temperature within the necessary minimum time.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a circuit configuration diagram showing a control circuit, and FIGS. 2 and 3 are diagrams for explaining an operation which is a premise of the present invention. FIG. 4 (a) is a diagram showing the operation of FIG. 3, FIG. 4 (b) and FIG.
FIGS. 6A and 6B are views for explaining an embodiment of the present invention, FIG. 6 is a schematic perspective view showing an exposure scanning device, and FIG. 7 is a perspective view showing a scanning mechanism of FIG. 11 …… Main unit, 23 …… Fluorescent lamp, 41 …… Main control unit, 43…
… Heater, 44… Temperature sensor.

Claims (1)

[Claims] 1. A light source for irradiating an original image with light, which has a stable light quantity at a first temperature, a heating means for starting heating of the light source upon power-on, and a heating means. Means for detecting that the temperature has reached a second temperature, which is lower than the first temperature; and after the heating means starts heating, the detecting means detects that the temperature of the heating means is the second temperature. A timer for measuring a first time until it detects that the time has reached, a calculation means for calculating a second time by multiplying the first time measured by the timer by a predetermined value, and the detection means. Control means for determining that the light source is in a light irradiation enabled state when the timer measures the second time after detecting that the temperature of the heating means has reached the second temperature. An exposure scanning device comprising: