JPS5930888Y2 - Optical system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical system of a facsimile machine, a copying machine, an optical character reading device, etc.

Conventionally, in this type of optical system, the optical lens is often used as a fixed lens, and therefore the adjustment section is currently concentrated around the imaging plane.

In many cases, each adjustment was made only once, so each adjustment component had to have multiple functions in consideration of cost.

FIG. 1 shows an adjustment section of an optical system of a conventional optical character reading device.

The optical lens 1 is mounted on an optical system base 2 that serves as a reference for the optical system for the entire apparatus.

Reference numeral 6 denotes an image sensor, and an image sensor board 6' to which the sensor 6 is attached is attached to the adjustment plate 4 via a compression coil spring 5.

The adjusting plate 4 is attached to the adjusting plate 3, and the housing adjusting plate 3 is attached to the base 2 through respective elongated holes.

In this case, 3', 4', and 5' are a fixing button and an adjusting screw, respectively.

Although this configuration has a simple structure, it has the following drawbacks.

In other words, the projection position is moved by moving the adjusting plates 3 and 4 along the direction of the elongated hole.
, 4 makes it difficult to adjust only the specified direction, making it difficult to reproduce.

Also, the height of the spring 5 can be changed using the screw 5'.
(focus shift in the longitudinal direction of the image sensor) is adjusted, but
Managing the reference distance from the optical lens 1 is difficult.
The present invention is intended to eliminate the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to FIG. 2.

In the figure, a indicates an adjustment section for the projection positions X and Y, and b indicates a projection range, an inclination θ of the projection position, and an tilt adjustment section.

The optical lens 10 is mounted on a Y direction adjustment plate 11, and
The direction adjustment plate 11 and the X direction adjustment plate 12 each have a length 1.
11 and 121, it is attached to the adjustment plate base 13 attached to the foundation of the optical system.

11, 12, and 13 are connected by adjustment screws 11' and 12', and the upper and lower ends of 12 are guided by a square rod 12'' fixed to the adjustment plate base 13.

Therefore, the adjustment accuracy in the X direction is good in part a, and no guide is provided for the adjustment plate 11 in the Y direction, so that
The structure allows for direction adjustment.

1γ is an image sensor, and an image sensor board 17' to which the sensor 17 is attached is attached to the first adjustment plate 16.

The first adjusting plate 16 and the second adjusting plate 15, and the second adjusting plate 15 and the third adjusting plate 14 are each configured to be rotatable by a shaft 15116' and holes 15"' and 16", The buttons 14 and 15 of the housing and the angle 14'' attached to the base of the optical system are connected by adjusting screws 14' and 15'.

Here, the axis 16, which is the center of rotation of the adjusting plates 15 and 16, is not provided on the optical axis because the hole 16'' requires a transmission window 16''.

Therefore, the movement includes components in the projection position X and Y directions, but since the movement rotates on the real image plane, no out-of-focus occurs.

Previously, in this embodiment, an image sensor 17 was installed on the extension line of the rotation center line formed by the shaft 15' and the hole 15"' as shown in FIG.
Since the image sensor 17 is located
There is no optical axis deviation or positional deviation due to rotation, and tilt adjustment is easy.

The bottom adjustment plate 14 is guided by the bottom button and both sides, and 14'
By moving the guide straight ahead, the distance from the optical lens 10 is changed to adjust the magnification, but depending on the accuracy of the guide,
The movement includes components in the projection position X and Y directions.

As described above, although each adjustment item cannot be adjusted independently, highly accurate adjustment is possible by performing the adjustment in the order of 16→15→14→11→12.

In this case, an adjustment is first made to make a movement including components in the projection position X and Y directions, and then an adjustment in the Y direction is made by step 11, but a movement including a component in the X direction is made.

Finally, adjustment in the X direction is performed by 12, but since the structure is such that the movement of 12 does not include other components, it is possible to absorb the X direction component in the previous adjustment.

This configuration is advantageous in terms of cost because precision is required at only one part of the series of adjustment parts, and each part has a single function, making adjustment easy. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the configuration of a conventional optical system, FIG. 2 is an exploded perspective view of an optical system according to an embodiment of the present invention, and FIG. 3 is a partial sectional view of the same. 10...Optical lens, 11,12...
Adjustment plate, 13...Adjustment plate base, 17...
...Image sensor, 14.15,16...Adjustment plate.

Claims (1)

[Scope of utility model registration request] a Y-direction adjustment plate on which an optical lens is mounted; an X-direction adjustment plate that holds the Y-direction adjustment plate movably in the Y-direction; and an adjustment plate that holds the X-direction adjustment plate movably in the X-direction. a base, a first adjustment plate holding an image sensor, a second adjustment plate that holds the first adjustment plate rotatably within a first plane, and the second adjustment plate described above. a third adjustment plate rotatably held within a second plane perpendicular to the first plane, the center line of rotation of the second adjustment plate and the sensor position of the image sensor being aligned. An optical system characterized in that the light transmitted through the optical lens is received by the image sensor.