JPH10276301A - Image input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an optical resolution changeover device with excellent assembling performance. SOLUTION: A line sensor 61 is placed behind a 1st lens 41 with a low resolution as an initial setting position, a control means 2 drives an actuator 5 to allow a ball screw 7 to carry the line sensor 61 and to stop it at the 1st lens 41 and a 2nd lens 42 so as to start reading. In the case that the user desires image reading at a high resolution, the control means 2 operates the actuator 5 to carry a line sensor holder 6 via the ball screw 7 and to stop the 2nd lens 42 with a selected high resolution at a position on an optical axis behind the 2nd lens 42 so as to start reading.

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 having means for reading at two different optical resolutions.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional image input device includes a main body 1, a line sensor 61 built in and fixed to the main body 1, and an actuator 5 fixed to the main body 1.
A transmission means 3 for transmitting the rotational motion of the actuator 5, a ball screw 7 linked to the transmission means 3,
A guide shaft 8 provided facing the ball screw 7, a lens holder 104 connected to the guide shaft 8 and the ball screw 7 to move, and a first lens 41 and a second lens 42 fixed to the lens holder 104;
Then, the actuator 5 is activated and the lens holder 104
And a control means 102 for controlling the line sensor 61 and reading the image data with the first lens 41 or the second lens 42 having different resolutions.

In this conventional image input apparatus, a first lens 41 having a low resolution is arranged in a reading optical path as an initial setting position, and when a user wants to read an image with a high resolution, a control means 102 controls the actuator 5 When activated, the second lens 42 starts reading at the position of the reading optical path.

[0004]

However, the conventional image input device has a problem that precise adjustment is required at the time of assembling because of the mechanical loading structure.

Accordingly, an object of the present invention is to provide an image input apparatus which realizes an optical resolution switching mechanism with good assemblability.

[0006]

In order to solve the above-mentioned problems, an image input apparatus according to the present invention comprises a main body, a lens holder built in and fixed to the main body, and a predetermined position of the lens holder. A first lens and a second lens having different fixed resolutions, a driving unit for performing a drive for selecting the first lens or the second lens, a transmission unit for transmitting a rotational movement of the driving unit, and the transmission unit Moving means interlocked with the means, a line sensor holder connected to and moving with the moving means, a line sensor fixed to the line sensor holder, Control is performed to select a lens or a second lens, and image data is read by the line sensor at the resolution of each of the first lens and the second lens. Characterized in that it consists of a control unit for cormorants control.

Further, in order to solve the above-mentioned problems, an image input apparatus according to the present invention is provided with the driving means formed by an actuator, a ball screw interlocked with the transmitting means, and provided to face the ball screw. And the above-mentioned moving means having a guide shaft.

[0008]

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 block diagram of an image input apparatus according to an embodiment of the present invention.

As shown in FIG. 1, an image input apparatus according to an embodiment of the present invention includes a main body 1, a lens holder 4 fixed in the main body 1, and a lens holder 4.
, A first lens 41 and a second lens 42 having different resolutions respectively fixed at predetermined positions, an actuator 5 for driving to select the first lens 41 or the second lens 42, and a rotational movement of the actuator 5 , A ball screw 7 interlocked with the transmission means 3, a guide shaft 8 provided to face the ball screw 7, and connected to the guide shaft 8 and the ball screw 7, and the ball screw 7 rotates. The line sensor holder 6 which is moved by the operation, the line sensor 61 fixed to the line sensor holder 6, and the line sensor 6
1 and the first lens 41 or the second lens 42
And control means 2 for controlling to read the data.

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 follows. As shown in FIG. 1, a line sensor 61 is disposed at the rear of the first lens 41 having a low resolution as an initial setting position. When the actuator 5 is driven, the ball screw 7 conveys the line sensor 61,
When the user stops reading at each of the first lens 41 and the second lens 42 and starts reading, and the user wants to read an image with high resolution, the control means 2 operates the actuator 5 to move the line sensor holder 6 to the ball screw. Transported through 7,
Reading is started by stopping at the position on the rear optical axis of the selected high-resolution second lens 42.

[0013]

As described above, according to the image reading apparatus of the present invention, when the reading resolution is changed, the two lenses are fixed, and the line sensor is moved to align the optical axes, thereby assembling the image at the time of assembly. Has the effect of reducing the accumulated error of and reducing the accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image input device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional image input device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Control means 3 Transmission means 4 Lens holder 5 Driving means (actuator) 6 Line sensor holder 7 Moving means (ball screw) 8 Moving means (guide shaft) 41 1st lens 42 2nd lens 61 Line sensor

Claims (2)

[Claims] 1. A main body, a lens holder built in and fixed to the main body, a first lens and a second lens having different resolutions respectively fixed at predetermined positions of the lens holder, and the first lens or the second lens. Driving means for performing driving for selecting the two lenses, transmitting means for transmitting the rotational movement of the driving means, moving means interlocked with the transmitting means, and a line sensor holder which is moved by being connected to the moving means And a line sensor fixed to the line sensor holder, and controlling the line sensor holder to select the first lens or the second lens by activating the driving unit, and the first lens or the second lens is controlled by the line sensor. Control means for controlling the second lens to read image data at each resolution. 2. The apparatus according to claim 1, wherein said driving means comprises an actuator, and said moving means includes a ball screw interlocked with said transmitting means, and a guide shaft provided to face said ball screw. The image input device according to claim 1.