JPH0724848Y2 - Contact image sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a side plate which is a part of a frame of a contact image sensor.

[Conventional technology]

As the character / figure scanning method, CCD type, CDS
Type and contact image sensor type etc.
The CCD type is the mainstream. However, the CCD type has a limit to miniaturization of the entire set because of its reading method.
On the other hand, the contact image sensor has the advantage that the size of the set in the thickness direction can be reduced because it can read up to the original size width of the same size as the reading width of the sensor. Along with the rapid increase in demand for the contact image sensor type reading method, the demand for smaller contact image sensors and smaller demands have become more severe.

3 (a) and 3 (b) are a front view and a side view, respectively, showing a conventional contact image sensor, and FIG. 4 is a sectional view of FIG. 3 (a). In the figure, (1) is frame A,
(2) is a sensor substrate mounted and fixed on the frame A (1), (3) is a frame B that is in sliding symmetry with the frame A (1), and (4) is a rod fixed to the frame B (3). Lens array, (5) LE mounted on frame B (3)
D, (6) is a glass plate, (7) is a platen, (8) is a document, (9) is a side plate, and (10) is a screw.

In the figure, an original (8) sandwiched between a glass plate (6) and a platen (7) is illuminated by an LED (5) which is a monochromatic light source, and the light reflected by the original (8) is a rod lens. An erecting equal-magnification image is formed on the sensor arranged on the sensor substrate (2) through the array (4), and the document is read.

Here, the glass plate (6) is surrounded by the frame B (3) and the two side plates (9), but when the platen (7) is rotated clockwise and counterclockwise for feeding the original (8), the glass plate (6) is rotated. The plate (6) moves, the original (8) is caught between the glass plate (6) and the frame B (3), and the glass plate (6) is held in the frame B.
There is a high possibility of hitting (3) and the side plate (9) and cracking.

[Problems to be solved by the device]

Since the conventional contact image sensor is configured as described above, when the glass plate is surrounded by the frame B and the two side plates, the platen rotates between the glass plate and the frame B when the platen rotates clockwise and counterclockwise. There have been problems such as the original being caught or the glass plate colliding with the frame B and the side plate due to rattling and cracking.

The present invention has been made to solve the above-mentioned problems, and a convex portion is provided at a portion of the side plate which is in contact with the glass plate to press the glass plate against the frame to prevent the movement of the glass plate and the catching of the original. The purpose is to obtain a contact image sensor which is prevented.

[Means for Solving the Problems]

In the contact image sensor according to the present invention, a convex portion is provided at the contact portion of the side plate with the glass plate to press the glass plate against the frame so that the glass plate does not move and the document is not caught between the glass plate and the frame. This prevents the glass plate from colliding with the frame and the side plates and cracking due to rattling.

[Action]

In the contact image sensor according to the present invention, since the glass plate is pressed against the frame by the convex portion provided on the side plate, the movement of the glass plate is eliminated, and the glass plate is caught or rattled between the glass plate and the frame. Prevents cracks in the document and enables stable reading and feeding of originals.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. First
1 (a) and 1 (b) are front and side views of a contact imager sensor according to an embodiment of the present invention, and FIG. 2 is FIG. 1 (a).
FIG. In the figure, (11) is a side plate with a convex portion,
(12) is a protrusion. The other symbols are the same as those of the conventional one.

Next, the operation will be described. The original (8) sandwiched between the glass plate (6) and the platen (7) is illuminated by the LED (5), which is a single light source, as in the conventional case.
The light reflected by the image passes through the rod lens array (4) and an erecting equal-magnification image of the original is formed on the sensor arranged on the sensor substrate (2) to read the original (8). Here, the glass plate (6) is formed by the side plate (11) with the convex portion into the frame B.
It is pressed against and fixed to (3).

In the above embodiment, the case where the side plate with protrusions (11) simply protrudes has been shown, but the side plate with protrusions provided with slits in the direction perpendicular to the weight direction may be used.

Further, in the above embodiment, the case where the side plate (11) with a convex portion is integrally formed is shown, but the same effect can be obtained even if the side plate (11) is integrally formed or divided. Further, the effect can be increased by using the elastic member for the side plate (11) with a convex portion.

[Effect of device]

As described above, according to the present invention, since the side plate is provided with the convex portion, the glass plate is securely pressed against and fixed to the frame, the glass plate is moved by the rotation of the platen, and the original is pulled between the glass plate and the frame. Since the glass plate is not broken and the glass plate is not cracked due to the displacement between the glass plate and the frame and the side plate, there is an effect that a contact image sensor capable of stably feeding and reading an original is obtained.

[Brief description of drawings]

1 (a) and 1 (b) are a front view and a side view showing a contact image sensor according to an embodiment of the present invention, and FIG.
FIG. 3A is a sectional view, FIG. 3A and FIG. 3B are front and side views showing a conventional contact image sensor, and FIG.
It is sectional drawing of FIG. In the figure, (1) is a frame A, (2) is a sensor substrate, (3) is a frame B, (4) is a rod lens array, (5) is an LED, (6) is a glass plate, and (7) is A platen, (8) a manuscript, (10) a screw, (11) a side plate with a projection, and (12) a projection. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A first frame, and a second frame which is held by the first frame and which is provided with a light source and a rod lens which focuses reflected light from an original from the light source.
A sensor substrate arranged on the first frame, on which a sensor for reading the information of the original from the reflected light focused by the rod lens is placed, a glass plate held by the second frame, and the glass. A platen roller that conveys the original document sandwiched between the plate and a portion that comes into contact with the edge of the glass plate in the direction perpendicular to the conveyance direction of the original document that is conveyed is formed with a protrusion, and the protrusion causes the contact. A contact image sensor comprising: a U-shaped side plate for pressing the edge of the glass plate against the second frame and fixing the first frame and the second frame.