JPH07159909A - Transparent document holder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a transparent original holder that can utilize the light quantity variation correction function incorporated in a flatbed type scanner. In a transparent original holder 3 used in a linear light source moving type transparent unit, an original sandwiching member 12 is attached to a frame 11 of the transparent original holder 3, and a side white reading area is provided along a light source moving direction. To be done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document holder used for a linear light source moving type transmission unit mounted on an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art When reading image information displayed on a document in an image forming apparatus, the document is placed on a contact glass on the upper surface of the apparatus, and a scanner of its reading optical system is moved along the contact glass. Is going on.

At this time, when the original is an opaque material such as a white background, a light source that moves with the scanner is applied to the original,
Although the image information is read by the reflected light, when reading an original made of a transparent film or the like such as an OHP sheet, as shown in FIG. 1, it is built in the transmission unit 2 hinged to the apparatus main body 1. Then, the light source synchronized with the reading optical system of the main body moves together with the scanner of the main body, and the image information is read by the transmitted light.

That is, when reading a transparent original, the light source on the main body side is not used and only the light source of the transparent unit is turned on.
Conversely, when reading a reflective original, turn on the light source on the main unit,
The light source of the transmission unit is not used. The switching of the reading method between the transparent original and the reflective original is performed by a command from the host computer.

[0005]

When a transparent original such as a film is read by using the flat bed type scanner shown in FIG. 1, the original is read to facilitate the positioning of the original. It is used by being sandwiched between holders.

Therefore, when sandwiching the film between the holders, it is required that the work is easy and the position can be surely held in the scanning direction of the reading optical system.

Further, there is a flat bed type scanner configured to read a reference white plate for each line in order to correct a light amount variation during moving reading, and such a correction function is used for a reading method for a transparent original. It is requested that it can be used also in.

In view of the above-mentioned demands, it is an object of the present invention to provide a transparent original document holder which can utilize the light quantity variation correction function incorporated in a flatbed type scanner.

[0009]

According to the present invention, there is provided a transparent manuscript holder used in a transmissive unit of a linear light source moving type, in which a manuscript pinching member is attached to a frame portion of the transmissive manuscript holder, and the light source moving direction By being configured such that the side white reading area is provided along the
Will be resolved.

It is preferable if the document sandwiching members are attached to the two sides of the frame portion which are orthogonal to each other.

When a transparent original such as a transparent film is read by a scanner of a reading optical system, transmitted light is used. Therefore, instead of the pressure plate attached to the main body of the apparatus for the reflective original, a transparent unit having a built-in illumination mechanism is used. It is attached. In this transmissive unit, the surface facing the scanner is a transparent glass because the light source emits light while moving, and as a result, when the transmissive unit is set, a slight gap is created between the glass and the contact glass of the device body. Oppose each other. Due to such a structure, the transmissive unit usually does not have a function as a pressure plate for pressing the document. Therefore, when the original or the like has a warp or the like, a load is further applied to the transmissive unit so that the unit is forcibly pressed from the outside so that the original becomes flat.
However, such a forced process is not preferable because it is troublesome and unnecessarily force is applied to the unit.

Therefore, it is preferable that an elastic member having a predetermined thickness is attached to the surface of the frame portion on the side opposite to the surface on which the document nipping member is attached.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments based on the drawings.

As shown in FIG. 2A, the transparent original document holder 3 comprises a rectangular frame body 11 and an original document sandwiching member 12 attached to one side of the frame body. The attachment position of the document sandwiching member 12 is not limited to the example shown in the figure, and may be a side facing the side or a side orthogonal to the side.

As can be seen in FIG. 2 (b), the frame 11
The document nipping member 12 attached to is bent on the side toward the central portion of the frame body, and nips the document from the nip portion formed by the bent portion and the frame body. At least this bent portion is elastic enough to bend with a slight force. One side of the frame body 11 that coincides with the sub-scanning direction of the scanner when the transparent original holder 3 is placed on the apparatus body (in the figure, the side that coincides with the attachment side of the original sandwiching member 12)
The outer edge of the is slightly recessed inward.

When the transparent original holder 3 is placed on the contact glass 14 of the apparatus main body 1, as shown in FIG. 3, the concave edge 13 side of the frame 11 is butted against the side white positioning scale 15. . As a result, the reading optical system can read the light passing through the space adjacent to the recessed edge 13 from the light source of the transmissive unit line by line and correct the light amount variation, so that the image can be read without unevenness.

FIG. 4 shows an improved example of the transparent original holder.
In this transparent original holder, original sandwiching members 12 are attached to two sides of the frame 11 which are orthogonal to each other. The transparent document is simultaneously sandwiched by these sandwiching members 12. It is the same as the above example that the outer edge of one side of the frame body 11 that coincides with the sub-scanning direction is slightly recessed inward.

As shown in FIG. 5A, the elastic member 16 is attached to the surface of the frame 11 of the transparent original holder opposite to the surface where the original sandwiching member 12 is attached. Figure 5
As understood in (b), this elastic member 16 is
1 extends all around. The total thickness of the frame 11 and the elastic member 16 is thicker than the gap width between the contact glass of the apparatus main body and the surface glass of the transmissive unit at the time of reading, and as a result, the transparent original holder is placed on the contact glass. When the transmission unit is closed, the elastic member 1
6 will be crushed by the transmissive unit,
The transparent original comes into close contact with the contact glass.

[0019]

In the transparent original holder according to the first aspect of the present invention, the original sandwiching member is attached to the frame portion of the transparent original holder, and the side white reading area is provided along the light source moving direction. At the time of reading, it is possible to detect the variation of the light amount for each line, so that the uneven density,
It is possible to read without uneven color.

In the transparent original holder according to the second aspect of the invention, since the original sandwiching member is attached to each of the two sides of the frame portion which are orthogonal to each other, the original can be accurately positioned with respect to the original holder.

In the transparent original holder according to the third aspect of the present invention, since the elastic member having a predetermined thickness is attached to the surface of the frame portion on the opposite side of the surface on which the original sandwiching member is attached,
For example, even when reading a warped transparent original, when the transparent original holder is placed on the original and the transparent unit is closed, the elastic member of the original holder is crushed and plays a role of pressing the original. Glass can be adhered.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a device configuration for reading a transparent original.

2A and 2B show an embodiment of a transparent original holder, FIG. 2A is a schematic plan view of the holder, and FIG. 2B is a sectional view taken along line AA of FIG. 2A. is there.

FIG. 3 is a diagram illustrating a state in which the transparent original holder of FIG. 2 is placed on the apparatus main body.

FIG. 4 is a schematic plan view showing another embodiment of the transparent original holder.

5A and 5B are perspective views showing a transparent original to which an elastic member is attached, FIG. 5A being viewed from the original sandwiching member attaching surface side, and FIG. 5B being being viewed from the back side.

[Explanation of symbols]

 3 Transparent Document Holder 11 Frame 12 Document Clamping Member 13 Recessed Edge

Claims (3)

[Claims] 1. A transparent document holder used in a linear light source moving type transmissive unit, wherein a document sandwiching member is attached to a frame portion of the transparent document holder, and a side white reading area is provided along the light source moving direction. And a holder. 2. The holder according to claim 1, wherein the document sandwiching member is attached to each of two sides of the frame portion which are orthogonal to each other. 3. The holder according to claim 1, wherein an elastic member having a predetermined thickness is attached to the surface of the frame portion on the side opposite to the surface to which the document nipping member is attached.