JPH0753057Y2 - Mirror fastener locking structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mirror fastener for fixing a mirror for reflecting an optical image from a document surface in, for example, an image processing apparatus, and particularly to such a mirror fastener. Related to the detent structure.

(Prior Art) Conventionally, in a so-called electronic copying machine for making a copy using an electrophotographic method, an image reading apparatus for scanning an image of an original surface to read an image as an electric signal, an image processing apparatus such as an image scanner, the original surface is , A lens for forming an optical image of the original surface illuminated by the lamp, and a component such as a light receiving element in an image scanner are arranged in a predetermined positional relationship to form a scanning head, The scanning head is moved in one direction to scan the original surface.

In such an image processing apparatus, by bending the optical path with a plurality of mirrors, the reflected light from the document surface is guided so as to enter the lens, or the optical image formed by the lens has an optical path length. Meanwhile, it is configured to form an image at a desired position.

Conventionally, the mirror that bends the optical path is fixed by a mirror fastener 11 as shown in FIGS. 4 (A) and 4 (B), for example.

Here, the mirror fastener 11 is made of sheet metal bent in a stepwise manner and has a through hole 14 into which a fixing screw 13 is loosely fitted in one step portion 12, while a die cast product is used. The frame 15 has a pedestal 17 that is parallel to the installation surface of the mirror 16.
Is formed, and a female screw 18 through which the fixing screw 13 is screwed is formed through this pedestal portion.
By screwing the fixing screw 13 inserted in 14,
The mirror fastener 11 is fixed to the pedestal portion 17. Mirror 16
Is mounted on the tip of the pedestal portion 17, and the mirror fastener
When 11 is fixed to the pedestal 17 by the fixing screw 13,
The other end of the mirror fastener 11 is elastically deformed and the hemispherical projection 11a formed on the lower surface of the mirror fastener 11 comes into contact with the mirror 16, whereby the mirror 16 is pressed and urged toward the pedestal 17 side, and the mirror 16 is pedestal 17 And is sandwiched between the mirror fastener 11 and.

(Problems of the prior art) However, according to the above-described conventional mirror fastener, when fixing to the pedestal by the fixing screw, the mirror fastener works around the screw axis along with the rotation of the fixing screw, and the positioning cannot be performed. For example, there is a problem that it is difficult to perform the automatic tightening work of the fixing screw. Further, even after the fixing screw is tightened, the mirror fastener moves around the screw shaft due to vibration or the like, so that the fixing screw is apt to be loosened.

(Purpose of the Invention) In view of the above circumstances, the present invention limits the rotation around the fixing screw shaft of the mirror fastener so that the mirror fastener can be positioned, thereby improving the screw tightening workability and preventing the fixing screw from loosening. The purpose of the present invention is to provide a detent structure for mirror fasteners that can fulfill the above requirements.

(Means for Solving the Problems) In order to achieve the above object, the rotation stopping structure of the mirror fastener according to the present invention is configured such that the other end portion of the mirror fastener whose one end is screwed to the pedestal by a fixing screw is used for the fixing operation. The mirror is clamped between the pedestal and the mirror fastener by pressing the mirror end portion against the pedestal along the screwing direction of the screw, and the mirror fastener around the fixing screw shaft. In order to limit the rotation by abutting on the edge of the mirror fastener, a protrusion portion is formed on the pedestal so as to be adjacent to the front side in the rotation direction around the fixing screw shaft of the mirror fastener. .

(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a scanning head 21 of an image scanner to which a rotation stopping structure of a mirror fastener according to the present invention is applied.

In the figure, the scanning head 21 includes a die cast frame 22 having a main body 23 in which CCDs, mirrors and the like are arranged, and a sheet metal frame 24 fixed to the main body 23 having a light source section 26 in which a lamp 25 and the like are arranged. The guide shaft (not shown) installed in the main body of the image scanner is inserted into a pair of bearings 27 penetratingly formed on one end side parallel to the sub-scanning direction of the main body 23, so that the main body 23 is It is supported so as to be movable in the sub-scanning direction perpendicular to the scanning direction.

A lamp 25 is supported by the light source unit 26 along the main scanning direction, and the illumination light from the lamp 25 is applied to the original 32,
Light reflected from the original 32 is guided into the main body 23.

As shown in FIG. 3 which is a cross-sectional view of the scanning head 21, the main body 23 has a plurality of mirrors 33, 34, 3 for making the optical path have a predetermined length.
5, 36, 37, 38 are built in, and the reflected light from the original 32, which is repeatedly reflected by these mirrors, is incident on the condenser lens 40. Then, the image from the condenser lens 40 is formed on the light receiving surface of the CCD provided on the substrate 28 along the main scanning direction, and the CCD reads the image of the original 32 by converting it into an electric signal. .

Mirrors 33,34,35,36,37,38 placed inside this body 23
However, it is fixed by the detent structure of the mirror fastener according to the present invention. Hereinafter, the description will be given with reference to FIGS. 1A, 1B, and 1C, which are enlarged views of the mirror fixing portion.

The pedestal portion 40 includes a mirror 41 (the first mirror) from both inner end surfaces parallel to the sub-scanning direction of the die-cast frame 22.
33 to the sixth mirror 38), which are formed so as to project in parallel to the installation surface, and have a stepped step portion and are tapered. A female screw 42 is formed through the base end portion of the pedestal portion 40, and a mirror fastener 43 is formed on the female screw 42.
A fixing male screw 44 for fixing the screw is screwed.

The mirror fastener 43 is made of sheet metal bent in a stepwise manner, a through hole 45 into which the fixing male screw 44 is loosely fitted is formed on the base end side, and the mirror 41 is attached to the end face on the front end side. A hemispherical projection 46 that is pressed is formed.

The end surface of the mirror 41 is placed on the end surface of the tapered tip portion of the pedestal portion 40, and in this state, the fixing male screw 44 inserted into the through hole 45.
Screwed onto the female screw 42 of the pedestal 40, the mirror fastener 43
The tip portion of the pedestal elastically deforms so that the projection 46 holds the mirror 41 in the base 40
By pushing it to the side, the end surface of the mirror 41 is sandwiched between the mirror fastener 43 and the pedestal portion 40.

Here, as a detent for the mirror fastener 43 fixed to the pedestal portion 40 by the fixing male screw 44, the mirror fastener 43 is attached to the close contact surface of the mirror fastener 43 at the base end portion of the pedestal portion 40.
A pair of partitions (projections) 47, 48 are formed so as to surround both sides of the projection. The partitions 47 and 48 are mirror fasteners 4
It is linearly extended from the inner end surface of the frame 22 to the step portion at an interval slightly larger than the lateral width of 3.

Since the mirror fastener 43 is installed and fixed in the space sandwiched between the partitions 47, 48, the fixing male screw 44 is replaced by the female screw 42.
When the mirror fastener 43 tries to rotate around the axis of the screw 44 along with the rotation of the fixing male screw 44 when it is screwed in, the side edge of the mirror fastener 43 is formed on the relative end surface of the partition parts 47, 48. And the mirror fastener 43 is restricted from rotating around the screw 44 axis. Therefore, the fixing operation of the mirror fastener 43 with the fixing male screw 44, that is, the positioning of the mirror fastener 43 when fixing the mirror 41 can be easily performed, and the automatic screw tightening operation is also facilitated.

Further, as described above, if the rotation of the mirror fastener 43 around the screw 44 axis is limited by the partitions 47, 48, the mirror fastener 43 rotates around the screw 44 axis due to vibration or the like in the usage state after being fixed. It is also possible to suppress the occurrence of loosening of the fixing male screw 44.

In this embodiment, the pair of partitions 47 and 48 are arranged so as to sandwich both sides of the mirror fastener 43, so that the edge of the mirror fastener 43 is brought into contact with the partitions 47 and 48 to limit the rotation thereof. However, one of the partitions 47 and 48 as described above may be provided, and a projection formed by projecting from the pedestal 40 in the through hole or notch provided in the mirror fastener 43. Align the screws 44 on the circumference of the
The rotation around the screw 44 may be restricted.

Further, although the present embodiment is directed to the scanning head 21 in the image scanner, the same effect can be obtained by applying the same to a mirror fastener of an electronic copying machine which makes a copy using an electrophotographic method.

(Effect of the Invention) According to the mirror fastener rotation stopping structure of the present invention, when the mirror fastener is fixed by the mirror fastener, the mirror fastener is positioned while being restricted from rotating around the fixing screw shaft, and therefore the mirror fastener is positioned. Improves the workability of fixing the mirror by using, and the automatic screw tightening work can be easily performed. Further, it is possible to prevent the mirror fastener from rotating due to the vibration after the fixing, and thereby to prevent the fixing screw from loosening.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a locking structure for a mirror fastener according to the present invention. (A) is a top view (B) is a front sectional view (C) is a side sectional view, and FIG. An overall perspective view of the applied scanning head, FIG. 3 is a sectional view showing the internal structure of the scanning head shown in FIG. 2, and FIG. 4 is a view showing a structure for fixing a mirror by a conventional mirror fastener (A) is a top view. (B) is a front sectional view. 22 …… Frame 40 …… Pedestal 41 …… Mirror 42 …… Female screw 43 …… Mirror fastener 44 …… Fixing male screw 45 …… Through hole 47,48 …… Partition

Claims (1)

[Scope of utility model registration request] 1. A mirror fastener having one end fixed to a pedestal by a fixing screw, and the other end of the mirror fastener pressing the mirror end to the pedestal along the screwing direction of the fixing screw. The mirror fastener is sandwiched between the pedestal and the mirror fastener, and the rotation of the mirror fastener around the fixing screw axis is restricted by abutting on the edge of the mirror fastener. 3. A detent structure for a mirror fastener, characterized in that a protrusion adjacent to the front in the rotation direction around the fixing screw shaft is formed on the pedestal.