JP3535676B2 - Scanning optical device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning optical device used in an image forming apparatus such as a laser beam printer, which deflects a light beam from a light source by a deflector and forms an image on a predetermined surface by an imaging lens. It is a thing.

[0002]

2. Description of the Related Art In a conventional scanning optical device of this type, for example, as shown in FIG. 6, in the traveling direction of a light beam from a light source 1, a collimator lens 2 for collimating the light beam and a shape of the light beam are formed. An aperture stop 3 for determination, a cylindrical lens 4 for converging a light beam in one direction and condensing it linearly, and a polygon mirror 5 for deflecting the light beam are sequentially arranged, and the polygon mirror 5 is rotationally driven by a scanner motor 6. It is like this. Mirror surface 5a of polygon mirror 5
A spherical lens 7, a toric lens 8 and a photosensitive drum 9 are sequentially arranged in the traveling direction of the light beam of the image area deflected by the. The spherical lens 7 and the toric lens 8 are deflected by the polygon mirror 5 at a constant angular velocity. A spot image is formed by scanning the light beam on the photosensitive drum 9 at a constant speed.

The fixed mirror 10 is arranged in the traveling direction of the light beam at the head of the non-image area deflected by the polygon mirror 5.
The imaging lens 11 and the synchronization sensor 12 are sequentially arranged on the fixed mirror 10 in the reflection direction. The signal from the synchronization sensor 12 is supplied to the mirror surface 5 of the polygon mirror 5.
When a has a division error, the timing of writing information is synchronized.

These elements are housed in an optical box (not shown), and the optical box is covered with a cover. The scanner motor 6 and the synchronization sensor 12 are connected to a controller (not shown) via wire harnesses 13 and 14, respectively. At this time, the scanner motor 6 and the wire harness 13 are connected via the connector 15, and a connector insertion hole for inserting the connector 15 is formed in the cover.

[0005]

However, since the connector insertion hole is formed in the cover in the above-mentioned conventional example, dust enters the optical box from around the connector 15 through the gap of the connector insertion hole, There is a problem that it adheres to the polygon mirror 5 and the like and deteriorates the performance.

An object of the present invention is to solve the above-mentioned problems and to provide a scanning optical device which can prevent dust from entering the optical box from around the connector.

[0007]

A scanning optical device according to the present invention for achieving the above object comprises a light source for emitting a light beam, a deflector for deflecting the light beam from the light source, and a deflector for deflecting the light beam. Is provided with a lens for forming an image of the light beam on a predetermined surface, an optical box for holding these light sources, a deflector, and a lens, and a cover for covering the opening of the optical box. In a scanning optical device connected to a connector of a container, the cover includes a recess and a bottom wall of the recess.
And projecting the connector into the recess
And a connector insertion hole provided so that
An elastic member is press-fitted into the
Between the elastic member and the side wall of the recessed portion or the elastic portion
It is characterized by passing inside the material .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 is a plan view of the first embodiment, and FIG. 2 is a plan view with a cover 21 removed.
A semiconductor laser light source 23 is provided in the optical box 22, and a collimator lens 24, a cylindrical lens 25, and a polygon mirror 26 are sequentially arranged in a traveling direction of a light beam L from the light source 23, and the polygon mirror 26 is a scanner motor. It is adapted to be rotationally driven by 27. In the traveling direction of the light beam L1 in the image area deflected by the mirror surface 26a of the polygon mirror 26, a spherical lens 28, a toric lens 29, and a folding mirror 30 that form an fθ lens are sequentially arranged.
A photosensitive drum (not shown) is arranged in the traveling direction of the light beam L1 folded back by. A fixed mirror 31 is arranged in the traveling direction of the light beam L2 in the non-image area deflected by the mirror surface 26a of the polygon mirror 26, and an imaging lens 32 and a synchronization sensor 33 are arranged in the reflecting direction of the fixed mirror 31. It is arranged.

The optical box 22 is provided with positioning pins 34 and 35 and guide holes 36 and 37 for adjusting the irradiation position of the light beam L1. The optical box 22 is covered with the above-mentioned cover 21, and the scanner motor 27 is connected with a wire harness 39 via a connector 38. The wire harness 39 is connected to the controller 40, and the controller 40 is connected to the synchronization sensor 33 via a wire harness (not shown).

As shown in the partially enlarged sectional view of FIG. 3, the cover 21 is provided with a recess 42 for accommodating the elastic member 41 above the scanner motor 27.
The size of the opening of the recess 42 is such that the elastic member 41 is compressed and accommodated in the direction of the arrow, and the bottom wall of the recess 42 is formed with a connector insertion hole 43 for inserting the connector 38. The elastic member 41 is made of, for example, Inoac Moltoprene (trade name), is formed larger than the size of the opening of the recess 42, and is press-fitted into the recess 42.
The recessed portion 42 is provided with a step portion 44 that matches the surface of the elastic member 41 with the surface of the cover 21 and supports the elastic member 41 so as not to contact the connector 38. Step 44
Is formed at a position higher than the upper surface of the connector 38 by a distance D in three directions except the side from which the wire harness 39 is taken out. In this case, the step portion 44 is formed in a step shape, for example, by making the lower portion have a small diameter.

When adjusting the direction x of the light beam L1 of the scanning optical device having such a structure, the optical box 22 is moved so that both positioning pins 34 and 35 move in the same direction. Further, when adjusting the direction θ of the light beam L1 of the scanning optical device, the optical box 22 is moved so that both positioning pins 34 and 35 move in opposite directions.

The light beam L diverging from the light source 23 passes through the collimator lens 24 to be collimated light, passes through the cylindrical lens 25, and is linearly focused on the mirror surface 26a of the polygon mirror 26. The scanner motor 27 rotationally drives the polygon mirror 26 at high speed, and the polygon mirror 26
Deflects the incident light beam L. Polygon mirror 26
The light beam L1 in the image area deflected by is transmitted through the spherical lens 28 and the toric lens 29, reflected by the folding mirror 30, and then imaged in a spot shape on the photosensitive drum. The light beam L1 scanned at a constant angular velocity by the rotation of the polygon mirror 26 scans the photosensitive drum at a constant velocity after passing through the spherical lens 28 and the toric lens 29, and the main scanning by the rotation of the polygon mirror 26 and the photosensitive drum. An electrostatic latent image is formed on the photosensitive drum by the sub-scanning by the rotation of. Since the elastic member 41 press-fitted into the recess 42 presses the wire harness 39 against the side wall of the recess 42, dust may enter the optical box 22 through the gap between the connector insertion holes 43 around the connector 38. There is no.

As described above, in the first embodiment, the elastic member 41 is used.
Since the wire harness 39 is pressed against the side wall of the recessed portion 42 by the above, the periphery of the wire harness 39 can be sealed, and dust from the periphery of the connector 38 can be prevented.
2 can be prevented from entering. Further, since the step portion 44 is provided at a position where the elastic member 41 does not come into contact with the connector 38, it is possible to prevent the elastic member 41 from being deformed due to the large bending of the wire harness 39 or the restoring force of the wire harness 39, and to prevent the elastic member 41 from surrounding A good seal can be achieved.

FIG. 4 is a plan view of the second embodiment, and FIG. 5 is a partially enlarged sectional view of the cover 50. A recess 52 for accommodating the elastic member 51, a connector insertion hole 53 for allowing the connector 38 to pass therethrough, A step portion 54 that supports the elastic member 51 on the upper side is provided. The elastic member 51 has a thickness of 10 mm or more, a cut 51a is formed in the elastic member 51, and the wire harness 39 is sandwiched in the cut 51a. The notch 51a is formed at a position that guides the wire harness 39 in a substantially straight line, in the arrangement direction of the wire harness 39. Then, the step portion 54 has the concave portion 52.
Is formed on the entire circumference of the side wall.

Here, the thickness of the elastic member 51 is determined by an experiment under the following conditions. That is, (1) The wire harness 39 is composed of 6 bundles each having a wire diameter of 1 mm. (2) The elastic member 51 is made of Inoac Moltoprene 1/2
Use a pressed product (product name). (3) The elastic member 51 is completely pressed into the recess 52. (4) Pull the wire harness 39 toward the controller 40 with a force of 100 gf.

According to this experiment, the depth t of the deflection v from the upper surface side of the elastic member 51 was about 5 to 9 mm.

In the second embodiment, the same effect as in the first embodiment can be obtained, the thickness of the elastic member 51 is 10 mm or more, and the step portion 54 is 10 mm or more from the surface of the cover 50. If formed in position, the wire harness 39
Even if a tension of 100 gf is applied from the side, it is possible to prevent a gap from being formed in the notch 51a.

Further, the wire harness 39 can be guided directly above the connector 38 by the notch 51a, and the step 54
Can be provided all around. Therefore, the deformation of the elastic member 51 due to the elasticity of the wire harness 39 can be reduced, and the sealing property between the elastic member 51 and the step portion 54 can be improved. In addition, the elastic member 51
Since it is not necessary to bend the wire harness 39 when press-fitting into the recess 52, the workability of assembling the elastic member 51 can be improved. Furthermore, since the elastic member 51 does not receive a force from the wire harness 39, it is possible to prevent the elastic member 51 from creeping or rising from the recess 52, and further improve the dustproof effect.

In the above-mentioned embodiment, the concave portions 42 and 52 are formed.
Although the step portions 44 and 54 are formed by reducing the diameter of the lower portion of the wire harness 39, the wire harness 39 is supported by the elastic members 41 and 51.
Any shape such as a protrusion can be used as long as it can lead to.

[0020]

As described above, in the scanning optical device according to the present invention, the elastic member press-fitted into the concave portion can seal the periphery of the wire harness, and dust can enter the optical box from the periphery of the connector. Can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a plan view with a cover removed.

FIG. 3 is a partially enlarged sectional view.

FIG. 4 is a plan view of the second embodiment.

FIG. 5 is a partially enlarged sectional view.

FIG. 6 is a configuration diagram of a conventional example.

[Explanation of symbols]

21,50 cover 26 polygon mirror 27 Scanner motor 38 Connector 39 wire harness 40 controller 41, 51 elastic member 42, 52 recess 43, 53 Connector insertion hole 44, 54 steps 51a notch

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 2/44 B41J 29/00 G02B 26/10 G03G 15/00 G03G 15/04 G03G 21/00 H04N 1 / 04 H05K 7/00

Claims (7)

(57) [Claims] 1. A light source for emitting a light beam, a deflector for deflecting the light beam from the light source, a lens for forming an image of the light beam from the deflector on a predetermined surface, and these light sources and deflectors. A scanning optical device comprising an optical box for holding a lens and a cover for covering an opening of the optical box, wherein a wire harness from a controller is connected to a connector of the deflector, the cover is a recessed portion, It is provided on the bottom wall of the recess
The connector was provided so as to project into the recess
A connector insertion hole, and an elastic member is pressed into the recess.
And the wire harness is in front of the elastic member.
Between the side wall of the concave portion or through the inside of the elastic member
Scanning optical apparatus characterized by there. 2. The scanning optical device according to claim 1, wherein a step portion that supports the elastic member at a position where the elastic member does not come into contact with the connector is provided in the concave portion. 3. The wire harness within the elastic member
3. The scanning optical device according to claim 2, wherein the scanning step passes through a portion, and the step portion is provided on all sidewalls of the recess. 4. The wire harness is provided in front of the elastic member.
3. The scanning optical device according to claim 2 , wherein the step portion is provided on all the remaining sidewalls of the recess except one sidewall which is in contact with the side wall of the recess and which is in contact with the sidewall of the recess. 5. The wire harness is one of the elastic members.
The scanning optical device according to any one of claims 1 to 3 , wherein the elastic member is provided with a notch for inserting the wire harness. 6. The scanning optical device according to claim 5, wherein the notch is provided at a position where the wire harness is guided substantially linearly from the connector. 7. The scanning optical device according to claim 3 , wherein the thickness of the elastic member and the depth of the step portion are 10 mm or more.