JP2613873B2 - Document reader with document detection function - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a document or the like, and more particularly, to a method in which an illuminating light source of a detection sensor is used as a collective light source and is also used as a light source for reading a document.

[Conventional technology]

Conventionally, this type of document reading apparatus is configured as shown in FIG. This is because, as a function for document detection, the light illuminated from the document detection light source 31 is given to the document detection sensor 32, and the document 36 is inserted in the document insertion direction 35 so that the light of the document detection-like light source is emitted. Intercept. Thus, the presence or absence of a document is detected. The document reading function illuminates the document surface with a document reading light source 33, and is read as a video signal by a document reading sensor. In this manner, the document detection function and the document reading function are separately and independently configured.

[Problems to be solved by the invention]

In the above-described conventional document reading apparatus, the light source for document detection and the light source for document reading are separately configured, and thus have a drawback that they are not suitable for downsizing.

[Means for solving the problem]

A document reading device with a document detection function according to the present invention includes a collective light source having a plurality of light sources arranged on a document reading position, an image sensor that receives a reflected light from the reading position to read the document, and A document detection sensor arranged at a position facing a part of the light source via the document, and a part of the light source is turned on when the document is not detected by the document detection sensor, and the document is detected. Has a control circuit for turning on all the light sources of the collective light source.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention. Also the second
FIG. 2 is a sectional view taken along line AA of FIG. In the figure, reference numeral 11 denotes a light source element which also serves as a document detection among collective light sources, 12 denotes a light source group excluding 11 of the collective light sources, 13 denotes a control circuit, 14 denotes an amplification circuit and a detection circuit of a detection sensor, and 15 denotes a document. Reading image sensor, 16 is an image sensor video circuit, 17 is a document detection sensor, 18 is a collective light source power supply, 19 is a light source supply switch circuit, 20 is a light source supply switch circuit, and 21 is a document insertion direction. Indicates a document reading position.

In the document reading apparatus of FIG. 1, in a state of waiting for document detection, the light source supply switch circuit 19 is controlled by an instruction from the control circuit 13.
Only the light source element 11 is illuminated by turning ON only the light source element 11. In this state, light is applied to the document detection sensor 17. The document inserted from the direction 21 is interrupted immediately below the reading position 22, and the document detection sensor 17 detects the presence or absence of the document by the document detection sensor 17, and notifies the control circuit 13. The control circuit 13 issues an "ON" instruction to supply the collective light source power supply 18 to the light source supply switch circuit 20 in order to turn on the collective light source group 12 for document reading. As a result, the document reading image sensor 15 repeatedly performs the operation of reading the document from the beginning to the end of the document by the light emitted from the reading light source. The end of the document is the reading position
When the document has passed through 22, the document detection sensor 17 is irradiated with light again, and the control circuit 13 recognizes that the document has run out through the amplification circuit and the detection circuit 14 of the detection sensor. As a result, the control circuit 13 issues an instruction to turn the light source supply switch circuit 20 to the “OFF” state, whereby the collective light source 12 is turned off, only the collective light source 11 is turned on, and the process returns to a state of waiting for insertion of a document. Hereinafter, these operations are repeatedly performed each time a document is inserted.

Although the embodiment of the present invention has been described with a configuration in which the document detection sensor is separate from the document reading image sensor, various modifications can be made such as sharing the document detection image sensor with the document reading image sensor.

〔The invention's effect〕

As described above, the present invention, when using a collective light source, shares the light source of the detection sensor for detecting a document with the effect of enabling downsizing of the reading device and the document light source for detecting the document among the collective light sources. There are two effects, namely, the effect of greatly reducing the reactive power consumption in the standby state by lighting only the part.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an original reading apparatus of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view of a conventional original reading apparatus. 11: a light source element that is also used for document detection among collective light sources,
12: light source group except 11 of the collective light sources, 13: control circuit, 14: amplification circuit and detection circuit of detection sensor, 15 ...
… Original image reading sensor, 16… Image sensor video circuit, 17… Original detection sensor, 18… Collective light source power supply, 19… Light source supply switch circuit, 20… Light source supply switch circuit, 21 … Original insertion direction, 22… Original reading position, 31… Original detection light source, 32… Original detection sensor, 33… Original reading light source, 34… Original reading image sensor, 35… Original Insertion direction, 203,36… Original.

Claims (1)

(57) [Claims] A collective light source having a plurality of light sources arranged on a reading position of a document; an image sensor for receiving reflected light from the reading position to read the document; and a part of the collective light source A document detection sensor arranged at a position facing the light source via the document, and in a state where the document is not detected by the document detection sensor, a part of the light sources is turned on to detect the document. And a control circuit for turning on all the light sources of the collective light source in the state.