JPH03220512A - Lens holder - Google Patents

Abstract

PURPOSE:To easily position the center of a lens on an optical axis by moving the center of the lens vertically by a moving means along a vertical plane and positioning it on the optical axis. CONSTITUTION:A vertical means 10 is positioned on the vertical plane 10a as to the horizontal direction of the lens 1 and fixed to a device side 20. Then the moving means 12 positions the lens 1 vertically. An adjusting knob 8 is rotated in one direction and the lens 1 moves up. When the adjusting knob 8 is rotated in the other direction, the lens 1 moves down by gravitation. Thus, an adjusting member 13 is moved to move up and down the lens 1, whose vertical positioning can be adjusted. Consequently, the center of the lens 1 can easily be positioned on the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lens holder used in an image forming apparatus such as a copying machine.

[Prior Art] Conventionally, in an image forming apparatus such as a copying machine, a lens holder for a lens used in an optical system for reading an original has a fifth lens holder.
The structure was as shown in the figure.

That is, the lens 1 is placed and fixed in a 7-shaped notch 51 on a base 50 that is cut in a 2-shaped shape.

[Problems to be Solved by the Invention] However, if this 7-shaped notch 51 is shifted in the horizontal direction of the paper, the optical axis will not align with the center of the lens 1, and
Even if this 7-shaped notch 51 is shifted in the vertical direction of the page (
(If the figure 7 cut 51 is deep or shallow)
, if the optical axis does not align with the center of lens l and the angle of V in the figure 7 shape is wide, lens l will go down, and conversely, if the angle of ■ is narrow, lens 1 will go up, and in addition V If the notch is not symmetrical on the paper and is tilted, the lens l will be shifted both horizontally and vertically on the paper, and the optical axis will not align with the center of the lens l, and the center of the lens A problem arose in that it was difficult to align the optical axes.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a lens holder that can easily align the center of the lens with the optical axis.

[Means for Solving the Problems] The present invention provides a lens holder that aligns and fixes the center of a lens to an optical axis, and includes vertical means having a vertical surface for positioning the lens in the horizontal direction; The apparatus is characterized by comprising a moving means for moving the center up and down along the vertical plane and positioning the center on the optical axis.

[Operation] In the present invention, the vertical means has a vertical surface for positioning the lens in the horizontal direction, and the moving means moves the center of the lens up and down along this vertical surface to position it on the optical axis. , horizontal blurring does not occur during positioning, and as a result, it is possible to easily position the center of the lens on the optical axis.

[Example] Hereinafter, an example of the lens boulder according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of an embodiment of a lens holder according to the present invention. 2 is a plan view of FIG. 1 seen from the -E direction, and FIG. 3(a) is a schematic front view of FIG.
FIG. 3(b) is a side view thereof.

In FIG. 1, a lens l and a lens holder 2 are connected to an image sensor 3 that forms an image of a document, and a reflection mirror (not shown) that receives and receives reflected light from an optical system. located in between. This image sensor 3 has a first
It is held by the holding member 4. The first holding member 4 is screwed onto and held by the second holding member 5. A second holding member 5 that holds the first holding member 4 is pivotally attached to the fixing member 6. By indirectly pivoting the image sensor 3 to the fixed member 6 in this manner, the image sensor 3 can be finely adjusted and a clear original image can be formed. Further, in FIG. 1, a cover 7 and an adjustment knob 8, which will be described later, of the lens holder 2 are shown. This lens holder 2 is attached to the image sensor 3 as shown in FIG.
It is on the front side (the human capital side of light).

The vertical means 10 has a vertical surface that positions the lens l in the horizontal direction. Specifically, as shown in the schematic front view of FIG.
A is used to position the center of the lens 1 in the horizontal direction with respect to the optical axis, and is fixed to the main body 20 of the apparatus. In this embodiment, the vertical member 10 of the vertical member 10 is L-shaped, and the horizontal surface 11a and the vertical surface 10a of the horizontal member 11 are integrally formed at an angle of 90°. This 90' angle is different from other angles and is an angle that is easy to process. Note that this angle is not limited to 90'. Other embodiments in that case will be described later.

The moving means 12 moves the center of the lens l up and down along the vertical surface 10a, and positions it on the optical axis. Specifically, as shown in FIG. 3(a), this moving means 12 includes a horizontal member 11, an adjustment member 13 that moves on the horizontal member 11, and an adjustment member 13 that has a male thread 8a that moves the adjustment member 13. A guide 1 that guides the knob 8, a threaded member 14 having a female thread 14a into which the male thread 8a is threaded, and an adjustment member 13.
5. It is composed of an elastic member 16 and the like that attempts to restore the adjusted member 13 after it has been moved. In FIG. 3(a), the horizontal member 11 is integrally formed with the vertical means 10 at an angle of 90' as described above, and its shape is approximately concave when viewed from above, with both sides The wall is formed a little higher, and the adjustment member 13 is misaligned (misalignment in the front and back directions of the paper in FIG. 3(a)).
Together with the guides 15.15 provided inside the walls on both sides, this is prevented. The shape of the adjustment member 13 is
For example, as shown in FIG. 3(a), it has a trapezoidal cross section, and its slope 13b supports the lens l. The adjustment knob 8 has a male screw 8a, and when rotated, the male screw 8a presses the adjustment member 13,
The adjustment member 13 is moved to the left. The threaded member 14 has a female thread 14a that threads into the male thread 8a of the adjustment knob 8, and also has a female thread 14a that threads into the male thread 8a of the adjustment knob 8.
The cover 7 is fixed by the upper surface 14b of this screwing member 14 together with 0b. The elastic member 16 is for returning the adjusting member 13 in the direction of the arrow B when the adjusting member 13 moves in the direction of the arrow B. Specifically, the elastic member 16 is for moving the adjusting member 13 back in the direction of the arrow B. The attachment provided at the lower part of the part 11 has a structure in which a spring is provided between the part 11b and the part 11b. However, the material is not limited to a spring, and may have other elastic force. Note that FIG. 3(b) is a side view of FIG. 3(a), showing the adjustment knob 8, cover 7, screwing member 14, horizontal member 11, etc. The material of this cover 7 is
Considering the vertical shift of the lens 1 during adjustment, it is desirable to have elasticity to absorb the shift.

In another embodiment, the vertical means 1O has a vertical surface 10a for positioning the lens 1 in the horizontal direction, but the angle between the vertical surface 10a and the horizontal member 11 is not limited to 90''. , acute angle, structure as shown in Fig. 4. In Fig. 4, in this case, the adjustment member 13 is moved on the horizontal member ll by the adjustment knob 8 and the elastic member 16, , the lens l moves up and down, and the adjustment member 13 positions the lens 1 in the vertical direction, as in the previous embodiment.

However, the horizontal member 11 of the moving means 12 is connected to the vertical means 10 and 90.
The difference is that they do not form a degree angle.

Next, the adjustment operation of the lens center position of the lens holder according to the present invention will be explained.

First, the vertical means 10 is fixed to the apparatus side 20 by positioning the lens 1 in the horizontal direction on the vertical surface 10a.

At this time, the lens 1 is in contact with the vertical surface 10a. Next, the moving means 12 positions the lens 1 in the vertical direction. That is, in FIG. 3(a), by rotating the adjustment knob 8 in one direction, the adjustment knob 8 and its male screw 8a are connected to the female screw 14a of the screwing member 14.
You will move in the direction of the arrow. When the tip of this male screw 8a presses the adjustment member 13, the adjustment member 13 also moves in the direction of the arrow. Then, the lens 1 supported by the slope 13b of the adjustment member 13 moves upward. Further, when the adjustment knob 8 is rotated in the other direction, the adjustment knob 8 and its male thread 8a move in the direction of arrow B in the female thread 14a of the screwing member 14. Then, the tip of the male screw 8a of the adjustment knob 8 is connected to the adjustment member 1.
3 is not pressed, and when the lower protrusion 13a of the adjustment member 13 and the horizontal member 11 are attached, the adjustment member 13 is moved in the direction of arrow B by the spring 16 provided between the portion 11b. As a result, the lens l supported by the slope 13b of the adjustment member 13 moves downward due to its own weight. In this way, by moving the adjustment member 13, the lens 1 is moved up and down, and the positioning of the lens 1 in the vertical direction can be adjusted. Incidentally, the adjustment operation is the same in the case of the other embodiment shown in FIG.

[Effects of the Invention] In the present invention, the vertical means has a vertical surface for positioning the lens in the horizontal direction, and the moving means moves the center of the lens up and down along this vertical surface to position it on the optical axis. Therefore, the center of the lens can be easily positioned on the optical axis.

[Brief explanation of drawings]

1 is a schematic perspective view showing an embodiment of the lens holder according to the present invention, FIG. 2 is a plan view of the embodiment shown in FIG. 1 viewed from above, and FIG. 3(b) is a side view of FIG. 3(a), and FIG. 4 is a schematic front view of another embodiment of the lens holder according to the present invention. The figure is a perspective view showing a conventional lens holder. 1... Lens 2... Lens holder 10.
...Vertical means 10a...Vertical surface 12...Movement means

Claims (1)

[Claims] A lens holder for fixing a lens with the center of the lens aligned with the optical axis, including a vertical means having a vertical surface for positioning the lens in the horizontal direction, and a vertical means for moving the center of the lens up and down along the vertical surface to adjust the direction of the light. A lens holder characterized by comprising a moving means for positioning on a shaft.