JPS5940681Y2 - optical reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical character reader having an adjustment mechanism for correctly focusing a reference line on a form on a light receiving element of the optical character reader.

2. Description of the Related Art In recent years, optical reading devices that optically read characters have become popular when computers are used to process increasingly large amounts of forms.

There are two types of devices: large, expensive machines that process large amounts of data at high speeds, and low-cost terminal devices that process small amounts of data at low speeds.The demand for terminal devices is increasing as communication circuits become more widespread.

This optical character reading device requires an optical device that reduces characters on a form using a lens and forms an image on a light receiving element to obtain a photoelectric signal.

In recent years, the technology of light-receiving elements has significantly advanced, and the size of the l element has decreased to 1.
A new optical device is being developed as it becomes possible to use a light-receiving element with 1728 elements arranged in a square with sides of 13μ.

When using this light-receiving element, it is necessary to form an image so that the reference line on the form correctly overlaps the element.

Therefore, after attaching the light receiving element, it is necessary to adjust its position so that the image is formed correctly.

However, the conventional type has the disadvantage that position adjustment is extremely difficult and it is not easy to accurately position the light receiving element.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a positioning adjustment mechanism for positioning the light receiving element on the optical path of the reflected light, so that it can be easily adjusted while observing the output of the measuring instrument. It is an object of the present invention to provide an optical reader capable of positioning a light receiving element.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 in FIG. 1 is a form, and a reflecting mirror 2 is provided above the form 1 at an angle of 45 degrees with respect to the surface on which characters are written.

A pair of lamps 4, 4 for illuminating the reading section 3 of the form 1 is disposed below the reflecting mirror 2, and the reflected light from these lamps 4, 4 is reflected by the reflecting mirror 2 at right angles. It is designed to be reflected.

Further, a KH lens 5 and a light receiving element 6 are disposed on the optical path of the reflected light, and the reflected light is reduced by the lens 5 and then focused on the light receiving element 6.

Note that the form 1 is conveyed in the direction of the arrow by a drive device (not shown).

Further, the light receiving element 6 is adjusted in the directions of arrows 8, 9, and 10 when attached, so that the image of the reading portion 4 of the form 1 is correctly formed on the light receiving element 6.

The lens 5 and the light receiving element 6 are integrated into a unit as shown in FIG. 2 so that the light receiving element 6 can be adjusted correctly.

That is, 11 in FIG. 2 is a lens block, and a mounting hole 11a is bored in the central part of this lens block 11, and a cylindrical housing 12 is mounted in this mounting hole 11a. .

A flange portion 12a is integrally formed at the rear end of the housing 12, and the housing 12 is assembled by fitting the flange portion 12a into a fitting groove 13 formed at the periphery of one end of the mounting hole 11a and attaching the fixing screw. It is fixed by 14.

The lens 5 is attached via a bayonet 15 to the distal end of the housing 12 attached in this manner.

On the other hand, the tip of the rotating tube 16 is inserted into the maggot puffer 15 from the rear side thereof.

A flange 17 is integrally formed on the circumferential wall of this rotating tube 160, and this flange 17 is attached to the housing 12.
It is in contact with the rear end surface of.

A fixing screw 18 for fixing the rotating tube 16 is attached to the housing 12, and the fixing screw 18 is screwed through a through hole 19 made in the lens block 11. It looks like this.

The rotary tube body 16VC thus attached has the first and second buttons and the third blocks 20, 21.degree. 22 attached thereto.

A through hole 20a is provided in the center of each of these flocks 20°21ν22.

21a, 22a are bored, and these through holes 20a,
The tube body 16 is inserted into the tubes 21a and 22a.

The above blocks 20 and 21. 22 are each formed with a dovetail groove, the first block 20 is fixed to the flange 17 of the rotating tube body 16 with a screw 23, the second block 21 is fixed in the vertical direction, and the third block 2 is fixed in the vertical direction.
2 is a sliding part that can be slid in the horizontal direction.

Further, fixing fittings 24 and 25 are attached to the peripheral walls of the first and second blocks 20 and 210, respectively, and adjusting screws 26 and 27 are respectively attached to these fixing fittings 24 and 25.

The adjustment screw 26 allows the second and third blocks 2
The third block 22 is moved up and down by 1° 22, and the third block 22 is moved in the left-right direction by an adjusting screw 27.

Furthermore, fixing screws 28 and 29 are provided in the dovetail grooves of the blocks 20, 21, and 220, and these fixing screws 28 and
, 29, the flocks 21, 22 after movement adjustment are fixed.

A position adjustment mechanism 30 is constituted by the above-mentioned rotating tube 16, the first and second ′: J, - and the third blocks 20, 21, 22, and the light receiving element 6 is attached to this adjustment mechanism 30. ing.

That is, the third block 22 has a spacer 31.
A printed board 32 is integrally attached to the printed board 32 through a socket 33 in the center of the printed board 32, and a light receiving element 6 is inserted and fixed therein so as to face the lens 5 at a distance.

Further, a cushioning material 34 is interposed between the printed board 32 and the rear end surface of the rotating tube 16 to prevent external light from entering the light receiving element 6.

Further, the inner circumferential surface of the rotating tube 16 is coated with a non-reflective coating.

Next, position adjustment of the light receiving element 6 will be explained.

First, the reference line 35 written on the form 1 is imaged onto the light receiving element 6, and the overlap between the element and the image is adjusted while observing the output signal with a measuring device.

That is, the vertical direction is adjusted by the screw 26, the horizontal direction is adjusted by the screw 27, and the rotation direction is adjusted by the flock 20.2.
1. Adjust by rotating the rotating tube body 16 along with 22.

When the outputs of all the elements are adjusted to the same level through this adjustment, the adjustment is completed, and the screws 28 and 29 are fixed to complete the positioning.

When adjusting the position of the light-receiving element 6 in the housing, it is necessary to remove the cover (not shown) of the device, and at this time external light enters. Since a light shielding member 34 is interposed between the two, external light does not enter the light receiving element 6, and the output of the measuring device does not fluctuate.

In the case where a plurality of light receiving elements 6 are used as shown in FIG. 3, the width of the lens block 11 can be made uniform and two adjustment mechanisms 30 can be arranged in parallel.

In this case, it is necessary to adjust the joint between the light receiving elements 6, 6 after each adjustment, but this adjustment mechanism 30 can do this.

Furthermore, although the blocks 20, 21, 22KH7 are slid by forming grooves therein, the present invention is not limited to this, and another sliding mechanism may be used.

Furthermore, this device is not limited to use in optical reading devices, but can also be used in other products such as facsimile SIJs.

Further, in the above embodiment, the adjustment is made by rotating the screws 26 and 27, so fine adjustment is possible.Furthermore, after the position adjustment, the dovetail groove is fixed by the screw 2829, so that when fixed, the Positioning can be performed with high precision.

As explained above, according to the present invention, a lens block having a through hole is provided on the optical path of reflected light to fix the lens,
With this lens block as a reference, the tube body and the first, second,
The rotation direction and the vertical and horizontal positions can be adjusted individually using the third flock.

Therefore, it is possible to perform accurate positioning adjustment while observing the output of the measuring device, and the operation thereof is extremely easy.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram of an optical device, FIG. 2 is a side view showing a partially broken main part, and FIG. 3 is a schematic configuration diagram showing another embodiment. 5... Lens, 6... Light receiving element, 11
... Lens block, 16 ... Tube body,
18...Fixing tool, 21...First flock, 22...Second block, 23...
Third block, 24, 26...First adjusting means, 25,2γ...Second adjusting means, 31°32
．． 33...Mounting member.

Claims (1)

[Claims for Utility Model Registration] A device that irradiates a reading section of an object to be read with light and forms an image of the reflected light on a light-receiving element via a lens, which has a through hole on the optical path of the reflected light and has one end a lens block to which a lens is attached on the side; a tube body attached to the inside of a through hole of the lens block, rotatable in a direction parallel to the optical path, and having a light passage through which the reflected light passes; a fixture that fixes the position in the rotational direction with respect to the lens block; a first block that is fixed to the outer edge of the tube fixed by the fixture; and a first block that is fixed to the first block and that is relative to the optical path vertical first
a second block movable in a direction; a first adjustment means for adjusting the position of the second block and fixing it to the first block; and a second block fixed to the second block whose position is adjusted by the first adjustment means. perpendicular to the optical path and above the second
a third block movable in a second direction also perpendicular to the moving direction of the block; a second adjusting means for adjusting the position of the third block and fixing it to the second block; An optical reading device, comprising: a mounting member fixed to the third block whose position is adjusted by a means and mounted with the light receiving element facing the lens at one end of the tube.