JPH11284815A - Image input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the image input device that decreases a position gap between a lens and a line sensor caused at assembling with an adjustment mechanism. SOLUTION: A line sensor 6 is placed at a rear part of a 1st lens with a low resolution initially, a read position by a focus and a line sensor is adjusted at this point of time, a focus of a 2nd lens 2 with other high resolution is adjusted, a setting command for resolution changeover is sent and an operation instruction is given to a drive section 4 to drive the line sensor 6 which is moved by receiving this setting command. Then the drive section 4 is operated and the line sensor 6 carries a sensor holder 31 through a ball screw 5 and stops the sensor holder 31 at a selected position on the rear optical axis of the 2nd lens 2 with high resolution. In the case that an optical axis of the line sensor 6 adjusted and fixed at this position is not aligned with the optical axis of the 2nd lens 2 with high resolution in a direction Z, the alignment is made by turning Z direction adjustment screws placed to the left and right so as to move the 2nd holder 21 vertically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device such as an image scanner and a facsimile, and more particularly, to an image input device provided with an adjustment mechanism for preventing a problem of an image when switching to a resolution.

[0002]

2. Description of the Related Art In a conventional image input apparatus, a first lens having a lower resolution is arranged in a reading optical path as an initial setting. Send this
An operation command is issued to the actuator of the lens switching mechanism.

After that, the actuator is operated, the holder on which the line sensor is mounted is conveyed via a ball screw, the selected second lens is stopped at the reading optical path position, and reading is started, and the holder includes the line sensor. The circuit board is adjusted and fixed at a predetermined position, a ball screw for moving the holder and a guide shaft are fixed to the base, and a unit including the base is a lens switching mechanism.

[0004]

However, since the conventional image input device has a mechanical loading structure,
If a gap occurs due to an accumulation error during assembly, clear image data cannot be obtained depending on the height when the lens is switched.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image input device which reduces a positional gap between a lens and a line sensor generated during assembly by an adjusting mechanism.

[0006]

In order to solve the above-mentioned problems, an image input apparatus according to the present invention comprises a first lens for forming an image of input image data, and a first lens based on the first lens. , A second lens that forms an image with a different resolution than the first lens fixed to the first holder, and is screwed to the base via a spring, and is movable in the z-axis direction. A second holder attached to the camera, a line sensor for reading an image formed by the first lens and the second lens, and an image read by the line sensor based on the image data. A setting means for setting the line sensor on the optical axis of the second lens, and a control means for controlling the line sensor set by the setting means to read the image data. That.

[0007]

Next, an image input apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram (A) of an image input device according to an embodiment of the present invention, and a front view and a side view (B) of a second holder.

FIG. 2 is a detailed view of the adjustment of the image input device according to one embodiment of the present invention.

As shown in FIG. 1, an image input apparatus according to an embodiment of the present invention has a first lens 1 for forming an image of input image data, and a base 7 having the first lens 1 as a base.
, A second lens 2 that forms an image with a resolution different from that of the first lens 1 fixed to the first holder 11, and a screw 2 attached to the base 7 via a spring 232.
31, a second holder 21 movably mounted in the z-axis direction, a line sensor 6 for reading an image generated by the first lens 1 and the second lens 2, and an image read by the line sensor 6. Based on the image data, a ball screw 5 for setting the line sensor 6 on the optical axis of the first lens 1 or the second lens 2, a setting means formed from the drive unit 4, and a line set by the setting means It comprises control means for controlling the sensor 6 to read image data, and a sensor holder 31 on which the line sensor 6 is mounted and transported.

Next, the operation of the image input apparatus according to one embodiment of the present invention will be described with reference to the drawings.

The operation of the image input apparatus according to one embodiment of the present invention is as shown in FIGS.
Is arranged as an initial setting at the rear of the first lens having a low resolution. At this time, the focus and the reading position by the line sensor are adjusted, the focus of another high-resolution second lens 2 is adjusted, and the resolution switching is performed. A setting command is sent, and an operation command is issued to the drive unit 4 that moves the movable line sensor 6 in response to the setting command.

Thereafter, the drive unit 4 is operated, and the line sensor 6 conveys the sensor holder 31 via the ball screw 5,
The lens is stopped at a position on the rear optical axis of the selected high-resolution second lens 2 and focus adjustment of the lens installed on the second lens 2 is performed. If the optical axes in the Z direction of the two lenses 2 are not aligned, a part of the waveform may not appear or may not appear at all.

Therefore, as shown in FIG. 1 (B), the position of the lens in the Z direction is raised and lowered by turning the left and right Z direction adjusting screws, and a desired signal waveform is obtained. Incidentally, the fixing of the second lens 2 and the second holder 2
1 is fixed.

[0015]

As described above, according to the image reading apparatus of the present invention, when the reading resolution is changed, one of the lenses is fixed and the position of the other lens in the Z direction can be adjusted. Accordingly, there is an effect that clear image data can be reliably obtained even when the lens is switched.

[Brief description of the drawings]

FIG. 1 is a configuration diagram (A) of an image input device according to an embodiment of the present invention, and a front view and a side view (B) of a second holder.

FIG. 2 is a detailed diagram of adjustment of the image input device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 3 Sensor holder 4 Setting means (drive part) 5 Setting means (ball screw) 6 Line sensor 7 Base 11 1st holder 21 2nd holder 22 2nd holder (support metal fittings) 211 2nd holder ( Holder screw) 221 Second holder (support screw) 231 Second holder (adjustment screw) 232 Second holder (spring)

Claims (1)

[Claims] 1. A first lens for generating an image of input image data, and a first lens for fixing the first lens to a base.
A holder, a second lens that forms an image with a resolution different from that of the first lens fixed to the first holder, and a second lens screwed to the base via a spring and movably mounted in the z-axis direction. A holder, a line sensor for reading an image formed by the first lens and the second lens, and an image formed by the first and second lenses based on the image data. An image input device comprising: a setting unit for setting the line sensor on a shaft; and a control unit for controlling the line sensor set by the setting unit to read the image data.