JPS61154359A - Information reader - Google Patents

Abstract

PURPOSE:To improve the responsiveness by lighting a fluorescent lamp only at reading an object to be read and controlling an internal heater of the fluorescent lamp to be turned on at all times. CONSTITUTION:When a power of the reader is turned on, the internal heater of the fluorescent lamps 3, 3 is turned on and the on-state is kept until the power is turned off. The fluorescent lamps 3, 3 go out during the standby state. In this case, the lighting control of the fluorescent lamps 3, 3 is started at a prescribed time elapsed after power-on in the lighting control of the fluorescent lamps 3, 3 just after power-on. Since the internal heater of the fluorescent lamps 3, 3 is turned on at all times, the responsiveness is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information reading device that optically reads image information of a document in, for example, a facsimile machine or a copying machine.

[Technical Background of the Invention] Conventionally, as an information reading device for optically reading image information of a document in, for example, a facsimile machine or a copying machine, there is an information reading device that uses a discharge lamp such as a fluorescent lamp as a light source. That is,
The document, which is a moving object to be read, is illuminated with a fluorescent lamp, and the reflected light is imaged by an imaging lens on a contact type one-dimensional image sensor arranged perpendicular to the direction of movement of the rough stone. Image information on a document is read by scanning.

[Problems in the Background Art] However, in such conventional information reading devices, if the fluorescent lamp is turned on all the time after the information reading device is powered on, the life of the fluorescent lamp will be short, and especially when reading color image information, Due to the color change of the light, the lifespan will be extremely shortened.

Further, if the information reading device is kept on all the time, a thermal problem occurs in that the temperature inside the information reading device increases.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to extend the life of the discharge lamp, suppress heat generation from the discharge lamp, and control the on/off of the discharge lamp. It is an object of the present invention to provide an information reading device that improves responsiveness even to

[Summary of the Invention] In order to achieve the above object, the present invention is such that the discharge lamp is turned on only when reading an object to be read, and the internal heater of the discharge lamp is always turned on. .

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a document table on which a document 2 as an object to be read is placed and set, and moves in the direction of the arrow shown in the figure. The moving document 2 is irradiated with light from fluorescent lamps 3, 3 arranged perpendicular to the direction of movement of the document 2, and the reflected light is used by an imaging lens (for example, a rod lens array) 4 to move the document 2. An image is formed on a contact type one-dimensional image sensor 5 as a photoelectric converter arranged perpendicular to the direction, and image information of the original 2 is read by scanning the image sensor 5. Note that 6 is a drive circuit that drives the image sensor 5, and 7 is a drive circuit that drives the image sensor 5.
is a signal processing circuit that processes the output signal of the image sensor 5. The fluorescent lamp 3.3 is turned on by the fluorescent lamp power supply circuit 8 at the timing shown in FIG.
Ill be configured to do so. That is, 'R8! of the device! At the same time that the fluorescent lamp 3.3 is turned on, the internal heater of the fluorescent lamp 3.3 is turned on (energized) and maintained in the on state until the power is turned off. Then, the fluorescent lamp 3.3 is turned on only when the original [2] is read, and the fluorescent lamp 3.3 is turned off during other standby periods. In this case, in a garden where fluorescent lamps 3.3 are turned on immediately after the power is turned on, '! 4IIl
After a predetermined time t (approximately 3 to 5 seconds) has passed after turning on, the fluorescent lamp 3 is turned on.
．． 3 starts lighting aiIIwJ.

In other words, immediately after the power is turned on, approximately 3~
Warm up the internal heater of the fluorescent lamp 3.3 for 5 seconds (approx.
(heated to 0° C.), and then on/off control of the fluorescent lamp 3.3 is started.

With such a configuration, since the fluorescent lamp 3.3 is not turned on during the th machine, the life of the fluorescent lamp 3.3 can be extended, and at the same time, heat generation from the fluorescent lamp 3.3 can be suppressed. Also,
The internal heaters of fluorescent lamps 3 and 3 are always on, so
Fluorescent light 3.3 turned on.

Responsiveness to off control is also improved. Furthermore, immediately after the power is turned on, by starting the lighting control of the fluorescent lamps 3.3 after the internal heater of the fluorescent lamps 3.3 has sufficiently warmed up, it is possible to prevent the fluorescent lamps 3.3 from turning black. .

In the above embodiments, the case where a fluorescent lamp is used as a light source has been described, but the present invention can be similarly applied to a case where other discharge lamps such as a mercury lamp are used.

[Effects of the Invention] As detailed above, according to the present invention, the life of the discharge lamp is extended, heat generation from the discharge lamp is suppressed, and responsiveness to on/off control of the discharge lamp is improved. It is possible to provide an information reading device for reading information.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and the second factor is a timing chart for explaining the operation of the embodiment. 1... Original table, 2... Original (object to be read), 3... Fluorescent lamp (discharge lamp), 4...
Imaging lens, 5... one-dimensional image sensor (photoelectric converter), 8... fluorescent lamp power supply circuit.

Claims (4)

[Claims] (1) Using a discharge lamp as a light source, the object to be read is irradiated with light from the discharge lamp, and the light from the object to be read is received by a photoelectric converter and converted into an electrical signal. In the information reading device that reads the above information, the internal heater of the discharge lamp is controlled to be always on after the power of the information reading device is turned on, and the discharge lamp is turned on when reading an object to be read and turned off at other times. An information reading device characterized by comprising a control means for controlling energization so that the information reading device (2) In the lighting control of the discharge lamp immediately after the information reading device is powered on, the control means starts the lighting control after the internal heater of the discharge lamp reaches a predetermined temperature. The information reading device according to scope 1. (3) The information reading device according to claim 1, wherein the discharge lamp is a fluorescent lamp. (4) The information reading device according to claim 1, wherein the photoelectric converter is a one-dimensional image sensor.