JP3006229B2 - Scanner document collection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder for a scanner using an image sensor or the like.

[0002]

2. Description of the Related Art Conventionally, in a scanner equipped with an automatic document feeder, the following methods have been studied as means for collecting a document from an original platen glass surface into the automatic document feeder. FIG. 5 is a first configuration diagram of a portion of a conventional apparatus for collecting a document in an automatic document feeder. The original 2a is fed while being pressed against the reading glass 12 for the automatic original feeder by the rotation of the roller 5, and at that time, the original 2a is illuminated by the illuminating device 7, and the illuminated original image is transmitted to the lens 9 by the mirror 8. The document 2a is guided, imaged on the image sensor 10 and read, and the document 2a passing through the reading glass 12 is collected into the automatic document feeder by the paper rake 6 inserted into the concave portion of the case beam 13. FIG. 6 is a second structural view of a portion for collecting an original in the automatic original feeder. The original 2a having passed the reading position is automatically moved by the paper rake 6 inserted into the original rake groove 14 of the original platen glass 1. Collected in the feeder.

FIG. 7 is a third structural view of a portion for collecting a document in the automatic document feeder. The document 2a is rotated by the rotation of the roller 5 so that a document guide transparent sheet attached to the automatic document feeder is provided. Sent while being pressed against 26. The original 2a that has passed the reading position is placed on the original guide transparent sheet 26.
Is collected in the automatic document feeder.

[0004]

In the document collecting means of the conventional automatic document feeder, in the first conventional example, a paper scoop is inserted between the platen glass and the glass for the automatic document feeder. A beam shape is required to cover between the two glasses.
In the case where the beam and the beam are integrated, molding failure such as insufficient filling or warpage of the beam is likely to occur, and it is necessary to separate the beam shape. Further, the beam shape and the glass for the automatic document feeder are elongated in the main scanning direction, and the periphery of the automatic document feeder becomes weak.

Further, the second conventional example has a drawback in that a groove is formed in the original table glass itself, so that the groove processing of the original glass becomes very expensive.

In a third conventional example, when a lens is focused on the surface of a normal document for reading the normal document,
When using the automatic document feeder, a transparent sheet for the document guide
Since the sheet is sandwiched between the platen glass and the document, the lens focus shifts by the thickness of the sheet. Conversely, when the document is focused on using the automatic document feeder, the lens focus is usually set when reading the document. There was a disadvantage that it shifted.

[0007]

A document collecting apparatus for a scanner according to the present invention has a function of moving an optical system to read a document while the document is stationary, and a function of moving a document by an automatic feeder while the optical system is stationary. in the scanner with bets, a transmission type platen in which a document is placed as a stationary state, the document is automatically sent provided on the upper surface of the platen that
Comprising a transparent member for moving the upper surface, and a paper scooping means provided on the stepped portion between the platen and the transparent member, the electrostatic document
When scanning with the optical system in the stopped state,
The mounting reference position is the stepped portion .

[0008] Further, a document collection device for a scanner according to the present invention includes:
A second transparent member for correcting the focal position on the lower surface of the platen
It is characterized by having been provided .

Further, the document collection device of the scanner according to the present invention is
A function to read an original by keeping the original stationary and moving the optical system
With the optical system at rest, and transfer the original with the automatic feeder.
In a scanner having a function of moving and reading
And a transparent platen on which the
An automatically fed document placed on the upper surface moves on the upper surface.
And a transparent member for
Paper scooping means, and focus on the lower surface of the platen
A second transparent member is provided for correction .

[0010]

FIG. 1 is a block diagram of a method for collecting a document into an automatic document feeder in a scanner according to the present invention.

In the case of reading without using the automatic document feeder, the optical system is in a normal reading state 11b, and moves in the sub-scanning direction to read the document 2b.
The original image is illuminated by the illumination device 7 and guided to the lens 9 by the mirror 8 to form an image on the image sensor 10. When the automatic document feeder is used, the optical system is in the automatic document feeder use state 11a, and the original 2a is fed while being pressed against the transparent upper glass 3 by the rotation of the roller 5, and is transmitted by the transparent lower glass 4. The lens focus is moved from the surface of the platen glass 1 to the surface of the upper glass 3, and then the original 2 a passing through the upper glass is automatically fed by the step between the upper glass 3 and the platen glass 1 and the paper rake 6. Collected in the device. If the top glass 3 is not provided, the document 2a is sandwiched between the paper rake 6 and the platen glass 1, and the document 2a cannot be separated from the platen glass 1 and cannot be collected.

FIG. 2 is a first detailed view of a rake portion of a document of the automatic document feeder.
The original scale, which is printed on the white reference printing surface 24 which does not hinder reading and illumination, and serves as a reference for arranging the originals, is also on the surface of the transparent top glass 3 and does not hinder reading and illumination. When the normal original 2b is printed on the original scale print surface 23 and the normal original 2b is set, the original position is determined by pressing the original end against the edge of the upper glass 3.

FIG. 3 is a second detailed view of the rake portion of the original of the automatic document feeder, and is a part for both scale and white reference.
Reference numeral 5 denotes a scale having an upper surface and a lower surface serving as a white reference. When the original 2b is placed on the platen glass 1, the scale can be confirmed through the transparent upper glass 3, and the reading and reading can be performed. When the original 2b is installed at a position that does not hinder the illumination and the ordinary original 2b is installed, the original position is determined by pressing the original end against the edge of the upper glass 3.

FIG. 4 shows the principle of the change of the lens focal point when the automatic document feeder is used and during normal reading.

The lens optical path 15 at the time of normal reading is refracted by the original table glass 1 at the position of the refraction point 20, and becomes like an optical path 17 in the glass, and forms an image on the surface of the original table glass 1. In this state, if the optical path 15 is bent like the optical path 17 at the position of the overhead line 22, the optical path becomes like the overhead optical path 18. In order to obtain an optical path similar to the optical path 18, the optical path 16 is refracted at the refraction point 21 by the lower surface glass 4, an optical path 19 in the glass is obtained, and the upper surface glass 3 is provided to press the document at the focal point of the optical path 19. According to the above principle, an optimal lens focal position can be obtained both when the automatic document feeder is used and when it is not used. The upper glass and the lower glass need not be glass as long as they are transparent members.

[0016]

According to the present invention, an original is fed into the automatic original feeder without forming grooves on the original glass, and without providing a separate glass apart from the original table glass in the sub-scanning direction. It is very inexpensive and easy to process.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a scanner according to the present invention.

FIG. 2 is a detailed view of a scanner according to the present invention.

FIG. 3 is a detailed view of a scanner according to the present invention.

FIG. 4 is an optical principle diagram of a scanner according to the present invention.

FIG. 5 is a diagram illustrating the configuration of a conventional scanner.

FIG. 6 is a diagram illustrating the configuration of a conventional scanner.

FIG. 7 is a diagram illustrating the configuration of a conventional scanner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 platen glass 2a document for automatic document feeder 2b normal reading document 3 top glass 4 bottom glass 5 automatic document feeder roller 6 automatic document feeder paper rake 7 lighting device 8 mirror 9 lens 10 image sensor 11a automatic Document feeder use state 11b Normal reading state 12 Glass for automatic document feeder 13 Case beam 14 Document rake groove 15 Lens light path for normal reading 16 Lens light path for automatic document feed 17 Optical path in glass 18 Overhead optical path 19 Optical path in glass 20 Inflection point 21 Inflection point 22 Overhead line 23 Original scale print surface 24 White reference print surface 25 Scale / white reference shared component 26 Transparent sheet for original guide

Claims (3)

(57) [Claims] 1. A document a stationary state and a function of reading by moving the optical system in the scanner and a function of reading is moved by an automatic feeder the originals to the optical system and the stationary state, a stationary state the document transmission and platen of placing a document to be the automatic feeding is provided on the upper surface of the platen is its
A transparent member for moving the upper surface, and a paper scooping means provided on the stepped portion between the transparent member and the platen, the document with the stationary state when reading by moving the optical system
A document collection device for a scanner, wherein the reference position for placing the document is the stepped portion . 2. A method for correcting a focal position on a lower surface of the platen.
2. The scanner element according to claim 1, further comprising a second transparent member.
Paper collection device. 3. The method according to claim 1, wherein the original is kept stationary and the optical system is moved.
The reading function and the automatic
A scanner having a function of moving and reading by a feeding device.
In Na, a transmission type manuscript stand for placing the original document as a still state, the original pixel is the automatic feed provided on the upper surface of the platen
A transparent member for moving the upper surface of the document, and a paper sheet provided at a step between the platen and the transparent member.
A second transparent portion for correcting a focal position on a lower surface of the platen.
A document collection device for scanners equipped with materials.