JPH0623094Y2 - Contact type image sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a contact image sensor, and more particularly to an optical system adjusting device.

[Conventional technology]

In recent years, contact image sensors have come to be widely used in facsimiles, OCRs (optical reading devices) and the like. In these contact image sensors, a Selfoc lens array (hereinafter referred to as SLA) is often used as an optical system for forming an optical image of a document on an optical sensor.

Since the SLA has a small depth of focus, it is necessary to adjust the position to bring it to an intermediate position between the original and the optical sensor. FIG. 2 is a view showing a cross section of a conventional adjusting device for an optical system (SLA) of a contact image sensor. Selfoclens array (SLA) 1 has a spring 2 attached to a frame 6.
It is fixed by being pushed down by 3 and 3 and pushed up by screws 7 and 8. In the gap for adjusting the position of the SLA1, the screw 7 or 8 is rotated and moved up and down to move the SLA1 up and down, and the position is adjusted to an intermediate position between the optical sensor (not shown in FIG. 2) and the document to be read.

[Problems to be solved by the invention]

In the above-mentioned conventional optical system adjusting device for the contact type image sensor, since the amount of vertical movement of the SLA 1 is the same as the amount of movement of the screws 7 and 8, the accuracy of adjustment is determined by the screw 7, Determined by the size of the pitch of 8,
It had the drawback that it could not be adjusted with high precision.

[Means for solving problems]

The contact type image sensor of the present invention comprises at least an optical sensor, a SELFOC lens array, and means for adjusting the position of the SELFOC lens array at an intermediate position between the original to be read and the optical sensor. A spring that presses one end of the SELFOC lens array in the same direction as the position adjustment direction, a screw with a tapered tip, and a tapered portion of the screw with one end of the SELFOC lens array with which the spring contacts. The thickness of the tapered portion of the screw that is brought into contact with the end of the SELFOC lens array by contacting the opposite end and rotating the screw to move the screw in a direction different from the position adjustment direction. And means to change.

That is, according to the present invention, the thickness of the tapered portion of the screw contacting the SLA is changed by the amount obtained by multiplying the pitch of the screw by the tangent (tan θ) of the angle θ of the tapered portion when the screw is rotated once. Therefore, by adjusting the taper angle to less than 45 degrees (shallow), the SLA for position adjustment
Can be made smaller than the moving amount of the screw, and the problem of the conventional optical system adjusting device of the contact type image sensor that cannot be adjusted with high accuracy because the adjustment accuracy is determined by the size of the screw pitch can be solved. .

〔Example〕

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

FIG. 1 is a sectional view of an embodiment of the present invention. The Selfots lens array (SLA) 1 is fixed by being pushed downward by springs 2 and 3 attached to a frame 6 and by being pushed upward by screws 4 and 5. The tips of the screws 4 and 5 are tapered, and when the position of the SLA is adjusted, the screw 4 or 5 is rotated to change the thickness of the taper portion contacting the SLA to move the SLA up and down. The position is adjusted to an intermediate position between the optical sensor (not shown in FIG. 1) and the document to be read.

[Effect of device]

As described above, according to the present invention, the position of the SLA is adjusted by rotating a screw having a tapered tip and changing the thickness of the taper contacting the SLA. There is an effect that the adjustment can be performed with high accuracy regardless of the screw pitch.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional optical system adjusting device for a contact image sensor.

Claims (1)

[Scope of utility model registration request] 1. A contact type image sensor comprising at least an optical sensor, a SELFOC lens array, and means for adjusting the position of the SELFOC lens array at an intermediate position between the original to be read and the optical sensor. The adjusting means presses one end of the SELFOC lens array in the same direction as the position adjustment direction, a screw having a tapered tip, and a SELFOC lens array in which the spring contacts the tapered portion of the screw. To the end opposite to one end of the screw, the screw is rotated to move the screw in a direction different from the position adjusting direction, and the tapered portion of the screw brought into contact with the end of the SELFOC lens array. And a means for changing the thickness of the contact type image sensor.