JPH0514594A - Lens adjusting device - Google Patents

Abstract

PURPOSE:To adjust the focus of a lens only with operation of a rotary ring without use of a special jig in the lens adjusting device of an original read mechanism for a facsimile equipment or the like. CONSTITUTION:A middle part of a plate spring 5 used to fix a lens 4 is in press contact into a groove provided to a lens barrel of the lens 4 and fitted, a rotary center 7 is provided to one end of the plate spring 5 and the spring is turned within a plane in parallel with an optical axis and the other end is in contact with a rotary ring 8 with a screw thread processed thereto and the lens 4 is slid in forward/backward direction only by turning the rotary ring 8 to adjust the focus easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens adjusting device for a document reading mechanism such as a facsimile.

[0002]

2. Description of the Related Art As one of the reading mechanisms of a facsimile machine,
Although there is a reduction optical system using a ccd sensor and a lens, this optical system requires a reading position adjustment in which the light receiving bodies of the ccd sensor are aligned in parallel to the reading line and a lens adjustment for focusing.

A conventional lens adjusting device is shown below in FIG.
The description will be made with reference to FIG. As shown in the figure,
A ccd board 1 having a light source 12 for illumination near a document 11 to be read and a ccd sensor 14 mounted on a mount 13.
5 is fixed, and a groove 13a for allowing the lens 16 to slide in the optical axis direction is provided, and the lens 16 is mounted on the groove 13a.
It is pressed by 7 and is fixed by tightening with a fixing screw 18.

The operation of the lens adjusting device constructed as above will be described below. One line of the original is optically reduced by the lens 16 and imaged on the surface of the ccd sensor 14 and photoelectric conversion is performed. Due to manufacturing variations in the focal length of the lens 16, the lens 16 and the ccd sensor 1
Focusing is necessary to adjust the distance to 4. Therefore, after the lens 16 is slid in the optical axis direction to adjust the focus,
The leaf spring 17 presses the lens 16 and the fixing screw 18 fixes it.

[0005]

However, in the above-mentioned conventional structure, it is necessary to move only the lens after loosening the fixing screw 18, but the leaf spring 17 interferes with the movement and cannot be moved smoothly. There was a problem of having to use a jig.

The present invention solves the above problems, and an object of the present invention is to provide a lens adjusting device capable of adjusting the focus of a lens without using a special jig.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention presses and engages a central portion of a leaf spring for fixing a lens with a groove provided in a casing of a lens, and attaches it to one end of the leaf spring. A center of rotation was provided to allow rotation in a plane parallel to the optical axis, the other end contacting a threaded rotating ring.

[0008]

According to the present invention, in the above structure, the fixing screw is loosened,
The focus of the lens can be adjusted simply by rotating the rotary ring and moving the leaf spring back and forth.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens adjusting device according to an embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, a mount 1 is fixed with a ccd substrate 3 having a ccd sensor 2 mounted thereon, and a lens 4 is attached.
Is provided with a groove 1a which is slidable in the optical axis direction, a lens 4 is placed on the groove 1a, and the plate spring 5 presses the groove 1a and the fixing screw 6 tightens and fixes it. Groove 4a provided in the casing of lens 4
The leaf spring 5, which is pressed into contact with and is engaged with, is engaged with the groove 4a at an arc portion 5a provided in the central portion. Screw hole 5 of leaf spring 5
b is an elongated hole, which is rotatable around a pin 7 provided on the mount 1. The mount 1 is provided with a hole 16 and a female screw 1c. The male thread 8a cut at both ends of the rotary ring 8 engages with the female thread 1c, and the lens 4 slides back and forth by rotation,
It is held down by the leaf spring 5. The rotating ring 8 is adapted to engage with the groove 5c provided in the leaf spring 5.

The operation of the lens adjusting device configured as described above will be described below. For focus adjustment,
When moving the lens 4 to the original side, as shown in FIG. 4, when the fixing screw 6 is loosened and the rotary ring 8 is rotated in the arrow direction (clockwise), the leaf spring 5 rotates and the lens 4 moves in the arrow direction. To do. When moving the lens 4 to the ccd side, similarly, in FIG. 5, when the fixing screw 6 is loosened and the rotating ring 8 is rotated in the arrow direction (counterclockwise), the leaf spring 5 rotates and the lens 4 moves in the arrow direction. . When the lens is in focus, the fixing screw 6 is tightened to fix the lens 4.

[0012]

As is apparent from the above description of the embodiments of the present invention, in the present invention, the central portion of the leaf spring for fixing the lens is pressed into and engaged with the groove provided in the housing of the lens, and is attached to one end of the leaf spring. A rotation center is provided so that the lens can rotate in a plane parallel to the optical axis, and the other end comes into contact with a threaded rotating ring, so there is no need to move the lens back and forth using a jig. There is an excellent effect that the focus of the lens can be easily adjusted only by rotating the rotary ring.

[Brief description of drawings]

FIG. 1 is a plan view of a lens adjusting device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure of a lens, a leaf spring, and a mount.

FIG. 3 is a plan view showing the positional relationship between the lens and the leaf spring.

FIG. 4 is a plan view for explaining the operation of the rotating ring and the lens.

FIG. 5 is a plan view for explaining the operation of the rotating ring and the lens.

FIG. 6 is a plan view of a conventional lens adjusting device.

FIG. 7 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 mount 1a groove 1b hole 1c female screw 2 ccd sensor 3 ccd substrate 4 lens 5 leaf spring 6 fixing screw 7 pin 8 rotating ring 8a male screw

Claims (1)

What is claimed is: 1. A cc comprising a lens for optically reducing one line of a reading width of a document and a ccd sensor for performing photoelectric change.
d substrate, a mount that holds the lens slidably in the optical axis direction, slidable in a plane having a rotation center at one end and parallel to the optical axis, and centered in a groove provided in the lens barrel. A lens adjusting device comprising: a leaf spring, a portion of which is pressed and engaged with each other, and a rotating ring, which is provided in the mount while being in contact with the leaf spring, rotates along a groove of a screw and slides back and forth.