JP3092687B2 - Contact image sensor and information processing apparatus using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact image sensor and an information processing apparatus using the same, and more particularly, to irradiating light emitted from a light source directly onto a reading surface of a document from one direction and emitting the light from the light source. A contact-type image sensor that reflects a part of the received light to irradiate the reading surface from a direction different from the one direction and photoelectrically converts the light from the reading surface by a sensor array, and an information processing apparatus using the same. Things.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are sectional views showing the internal structure of a conventional contact type image sensor. As shown in FIGS. 4 and 5, a conventional contact image sensor includes a sensor substrate 6 on which a sensor 4 in which a plurality of pixels for performing photoelectric conversion are arranged and a protective film 7 for protecting the sensor 4 are mounted. Light-emitting diode array 3 as a light source for irradiating light to reading original 8
A configuration in which a lens array 5 which is a lens for forming an image of the original 8 to be read on a light receiving portion of the sensor 4 and a transparent member 2 serving as a reading surface are attached to a frame 1 as a means for supporting the same. Has become.

Here, the step portion 2-1 of the transparent member 2 shown in FIG. 4 is for reflecting the light from the light emitting diode array 3 to generate a reflected light 9-2. It is possible to reduce the influence of the shadow generated when the original 8 has irregularities such as the cut and pasted original 8-1.

The structure shown in FIG. 5 in which the reflection surface 2-2 is provided on a part of the transparent member can also reduce the influence of the shadow similarly to the structure shown in FIG.

[0005]

However, in the above conventional example, the direct light 9-1 from the light emitting diode array 3 is not used.
Considering the light amount ratio between the reflected light 9-2 and the reflected light 9-2,
Since the light path length is longer, it is difficult to make the light amount ratio 1: 1 and the influence of the shadows on both the front end 8-2 and the rear end 8-3 of the cut and pasted original 8-1 is similarly reduced. Was difficult.

[0006]

A contact type image sensor according to the present invention irradiates light emitted from a light source directly onto a reading surface of a document from one direction and reflects a part of the light emitted from the light source. A light attenuation unit that irradiates the reading surface from a direction different from the one direction, and attenuates light that directly irradiates the reading surface of the document in a contact type image sensor that photoelectrically converts light from the reading surface by a sensor array. A filter is provided in an optical path between the light source and the reading surface.

[0007] The information processing apparatus of the present invention is characterized by having the above-described contact-type image sensor, and means for supporting an original on the reading surface of said seal wear type image sensor.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention, the amount of light from a light source for irradiating the reading surface directly document (L _1), the light irradiated to said read up surface reflects a portion of light from a light source (L ₂₎ A light attenuating filter is provided in the optical path between the light source and the reading surface in order to adjust the ratio with the light amount to attenuate the light amount of the light (L ₁ ) directly applied to the reading surface of the original. Yes, it reduces the influence of shadows caused by irregularities on the document surface.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of the contact type image sensor according to the present invention. In FIG. 1, the same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, in this embodiment,
A light attenuation filter 10 is provided on a part of the transparent member 2 on the light source side. In this embodiment, the direct light 9-1 of the light emitted from the light-emitting diode array 3 is reduced in light quantity by the light attenuating filter 10, so that the indirect light 9-2 reflected on the glass reflecting surface 2-1 is reduced. Can be reduced to 1: 1 and the influence of the shadow generated in the cut and pasted original 8-1 can be reduced.

FIG. 2 is a sectional view of a second embodiment of the contact type image sensor according to the present invention. This embodiment has a structure in which a reflection surface 2-2 is provided on a part of a transparent member as in FIG. In this embodiment, the same effects as in the first embodiment can be obtained.

An image information processing apparatus using the contact type image sensor according to the present invention will be described below.

FIG. 3 is a schematic configuration diagram showing an example of a facsimile having a communication function as an image information processing device configured using the above-mentioned contact type image sensor.

In FIG. 1, reference numeral 102 denotes a feeding roller as feeding means for feeding the original 8 toward the reading position, and reference numeral 104 denotes a separating piece for reliably separating and feeding the originals 8 one by one. is there. Reference numeral 106 denotes a platen roller which is provided at a reading position with respect to the sensor unit 100 and regulates the surface to be read of the document 8 and also serves as a transport unit for transporting the document 8.

P is a recording medium in the form of a roll paper in the example shown in the figure. Will be played. Reference numeral 110 denotes a recording head as recording means for forming the image, and various types such as a thermal head and an ink jet recording head can be used. Also,
This recording head may be of a serial type or a line type. A platen roller 112 conveys the recording medium P to the recording position of the recording head 110 and regulates the recording surface thereof.

Reference numeral 120 denotes an operation panel provided with switches and messages for accepting operation input as input / output means, and a display unit for notifying the status of the apparatus.

Reference numeral 130 denotes a system control board as control means, which includes a control unit (controller) for controlling each unit, a drive circuit (driver) for the photoelectric conversion element, a processing unit (processor) for image information, a transmission / reception unit, and the like. Provided. 140 is a power supply of the apparatus.

As recording means used in the information processing apparatus of the present invention, for example, US Pat. No. 4,723,129 and US Pat.
It is preferable that the typical structure and principle are disclosed in the specification of 4740796. According to this method, at least one of the electrothermal transducers corresponding to the recorded information and having a rapid temperature rise exceeding the nucleate boiling is applied to the electrothermal transducer disposed corresponding to the sheet or the liquid path holding the liquid (ink). By applying a drive signal, heat energy is generated in the electrothermal transducer, causing the film to boil on the heat-acting surface of the recording head. As a result, bubbles in the liquid (ink) corresponding to the drive signal one-to-one. Is effective because The growth of this bubble,
The liquid (ink) is discharged through the discharge opening by contraction to form at least one droplet.

Further, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, a combination of a plurality of recording heads as disclosed in the above specification is used. Either a configuration that satisfies the length or a configuration as one integrally formed recording head may be used.

In addition, a print head of a replaceable chip type which can be electrically connected to the apparatus main body and supplied with ink from the apparatus main body by being attached to the apparatus main body, or the ink is supplied to the print head itself. The present invention is also effective when a cartridge type recording head provided integrally with a tank is used.

[0022]

As described above, according to the present invention,
The ratio between the amount of light (L ₁ ) from the light source that directly irradiates the reading surface of the original and the amount of light (L ₂ ) that irradiates a part of the light from the light source and irradiates the reading surface is adjusted. Thus, the influence of shadows caused by irregularities on the original surface such as a cut and pasted original can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a contact image sensor according to the present invention.

FIG. 2 is a sectional view of a contact-type image sensor according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram illustrating an example of a facsimile having a communication function as an image information processing device configured using a contact image sensor.

FIG. 4 is a cross-sectional view showing the internal structure of a conventional contact image sensor.

FIG. 5 is a sectional view showing the internal structure of a conventional contact image sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Transparent member 3 Light emitting diode array 4 Sensor chip 5 Lens array 6 Sensor substrate 7 Protective film 8 Document 10 Light attenuating filter

Claims (3)

(57) [Claims] A light emitted from a light source is directly applied to a reading surface of a document from one direction, and a part of light emitted from the light source is reflected on the reading surface from a direction different from the one direction. Irradiating, in a contact type image sensor that photoelectrically converts light from the reading surface by a sensor array, a light attenuation filter for attenuating light that directly irradiates the reading surface of the document between the light source and the reading surface. A contact image sensor provided in an optical path. 2. The contact type image sensor according to claim 1, further comprising a transparent member for defining a reading surface of the document , wherein the transparent member reflects a part of light emitted from the light source.
To irradiate the reading surface from a direction different from the one direction.
A contact surface image sensor provided with a reflection surface for light emission and the light attenuation filter. 3. An information processing apparatus comprising: the contact image sensor according to claim 1; and means for supporting a document on the reading surface of the contact image sensor.