JP2563052Y2 - End mirror support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an optical device in an image forming apparatus such as a laser printer or a digital type electronic copier.
The present invention relates to a device for supporting an end mirror disposed near an image carrier such as a photosensitive drum at an end of an optical path.

(Prior Art) In a device such as a laser printer or a digital electronic copier, image information is output to a laser beam emitter in order to write on an image carrier such as a photosensitive drum. A laser beam output from the light emitter is reflected by a rotary scanning unit such as a polygon mirror and a plurality of mirrors, and is used to write the laser beam on the photosensitive drum.

The optical system of the image forming apparatus described above is generally configured as shown in FIG. In the example shown in FIG. 4, the laser writing device 1 is shown by an optical path from the laser beam emitter 2 to the photosensitive drum 5, but the light output from the emitter 1 is a motor 3a.
Is scanned as information in the horizontal direction by the polygon mirror 3 driven at a high speed.

Then, the light is transmitted to a plurality of mirrors 4 and 4a and an end mirror.
The light is transmitted to the photoconductor drum 5 via the photoconductor 10, and the writing portion of the photoconductor drum 5 irradiates the image light. The photosensitive drum 5 is charged with a means for charging the photosensitive drum, a developing device, a toner image transfer unit, a cleaning device, and the like in the same manner as in the case of a device using a normal electrophotographic process. The apparatus is disposed and performs an operation of forming a toner image and an operation of transferring the toner image to a sheet.

In the optical system of the laser writing device configured as described above, as a means for supporting the end mirror 10, a support member configured in the same manner as in a general copying machine is often used. And JP-A-64-9255.

The support mechanism of the end mirror shown in the conventional example is the fifth type.
The insertion holes 7, 7a are respectively arranged in the support frames 6, 6a arranged on both sides of the end mirror 10, and the lower surface of the mirror is arranged with respect to the insertion holes. A plurality of supporting projections 8 are provided.

Further, a pressing spring member 9 is arranged on the upper surface of the mirror so that the mirror is pressed toward the projection 8 and held.

The support member for the end mirror as described above can be applied not only to a normal document scanning type copying machine but also to a writing device using a laser beam.

However, in devices such as laser printers, 1
In addition to writing one type of image using only one beam, there are cases where a plurality of types of image information are written using a plurality of laser beams, as in a color copier.

In an apparatus using a plurality of laser beams, it is necessary to arrange end mirrors corresponding to the respective optical paths, and adjust the optical path by the end mirrors to adjust the light path to the photosensitive drum. It is necessary to set.

However, the mirror adjustment mechanism used in the conventional optical system device as described above, for example, an adjustment screw or the like is provided for the fixed protrusion member of the support frame,
By making the adjusting screw appear and disappear, a trial and error adjustment is performed.

When using a support frame as described above, the operation of adjusting the optical path is relatively troublesome, and it is required that a large space be provided inside the apparatus in order to adjust the optical path. You.

To solve the above-mentioned problem, Japanese Patent Laid-Open No. 63-64
As disclosed in Japanese Patent Publication No. 014 or the like, it has been proposed to easily adjust an end mirror.

The holding member of the end mirror of the conventional example is configured as shown in FIG. 6, and has support frames 16 and 16a arranged at both end portions of the cylindrical mirror 15 and provided on the support frame. The cylindrical mirror 15 is inserted into the V-shaped support grooves 17 and 17a.
It is configured to support the cylindrical portion of.

In addition, the cylindrical mirror 15 is configured such that cylindrical support portions on both sides and a mirror at the center thereof are integrally formed, and a light reflecting surface set by the mirror has a cylindrical shape on both sides. It is provided so as to coincide with the axis of the member.

When the cylindrical mirror 15 is mounted on the support frame 16, two points on the cylindrical surface of the cylindrical mirror come into contact with the support grooves, so that the operation of supporting the cylindrical mirror is favorably performed. This can be performed, and even when the cylindrical mirror is rotated, the positioning of the cylindrical mirror can be easily performed.

(Problems to be Solved by the Invention) However, in the conventional apparatus as described above, for example, even when a mirror as shown in FIG. 6 is used, the axis of the photosensitive drum and the cylindrical mirror are twisted. In such a case, there is a problem that the adjustment becomes impossible.

Further, even when the cylindrical mirror is supported by the support frame, it is necessary to precisely manufacture a frame of an optical system device that supports the support frame, and this greatly affects the manufacturing cost of the device.

Furthermore, the cylindrical mirror has an advantage that its configuration can be simplified and its handling and the like can be easily performed as compared with a conventional mirror configured by combining a mirror and a support frame. Producing a mirror surface by performing processing such as cutting a cylindrical object has the disadvantage that the processing is troublesome and requires a lot of labor. The mirror has a problem that is not necessarily advantageous in terms of manufacturing cost as compared with the conventional end mirror.

(Purpose of the Invention) The present invention solves the above-mentioned drawbacks of the conventional end mirror holding member, and can easily cope with image twisting and the like, and can easily perform adjustment work. It is an object to provide a support device for an end mirror.

(Means and Actions for Solving the Problems) The present invention writes image information by irradiating light output from a laser beam output device to an image carrier via a rotary scanning unit and a plurality of mirrors. The present invention relates to an optical device of an image forming apparatus configured to perform the above. In the present invention, a support frame 40 having a cylindrical support shaft member 41 projecting inward and having a long hole provided in a portion around the support shaft member, holding a mirror, and a housing.
A mirror holding member 20 is formed by combining a mirror support frame 25 inside the mirror support member 21. The mirror support frame 25 is formed of a substantially semi-cylindrical member, holds a mirror on the concave surface side, and supports both ends. The lower plate member 35, which is configured as a receiving portion rotatably abutting on the shaft member 41, is provided partially on the concave surface side of the mirror support frame, and the mirror holding member is positioned at a position corresponding to the long hole of the support frame 40. A screw receiving portion 28 provided on the mirror support frame side of the member 20, and supported by a plurality of screw members with respect to the mirror support frame and the lower plate member, and a central axis of the support shaft member and a light reflection slope. A mirror provided in alignment with the rotation center axis located above, and rotating the mirror support frame with respect to the support shaft member, and fixing a fixing screw provided through a long hole of the support frame to the screw receiving portion. It is fixed Te.

With the configuration as described above, in the end mirror holding member of the present invention, the mirror holding member is rotated with respect to the support frame provided on the frame of the apparatus such as the image forming apparatus, so that the reflection angle of the mirror is adjusted. Adjustment and the like can be easily performed.

Further, the end mirror supported by the mirror holding member of the present invention can be easily adjusted with an adjusting screw with respect to the twisting of the image and the like, and the operation is not troublesome.

Furthermore, since the device of the present invention has a cylindrical support member for rotating the mirror holding member on the main body frame side, it can be easily manufactured and the support mechanism of the mirror holding member can be simplified. I can do it.

(Embodiment) The configuration of the end mirror support device of the present invention will be described with reference to the illustrated example.

The embodiment of the present invention shown in FIG. 1 shows a state in which a mirror holding member 20 for supporting an end mirror is attached to a support frame 40, and a portion inside the support frame 40 has a cylindrical shape. The support shaft member 41 is fixed by a set screw 43 or the like via a fixing flange.

And, with respect to the support shaft member 41, a mirror holding member
The semi-circular receiving member 26 provided on the mirror 20 is engaged so that the mirror holding member 20 can be rotated about the axis of the support shaft member 41.

On the mirror holding member 20, a housing 21 constituting an outer member thereof is formed in a groove shape, a mirror support frame 25 is inserted into the housing, and both members are set screws 22.
Are fixed together.

After the mirror holding member 20 is mounted on the support frame 40, a fixing screw 46 is mounted on the screw receiving portion 28 through an elongated hole 45 provided in the support frame, and the mirror holding member 20 is mounted.
Is fixed.

The mirror holding member 20 of the present invention configured as described above
As shown in FIG. 2, the housing 21 and the mirror support frame 25 are combined to support the end mirror 10 with respect to the mirror support frame 25.

In the mirror holding member 20 shown in FIG. 2, a mirror support frame 25 housed inside a housing 21 is provided.
Is constituted by a substantially semi-cylindrical member, and both ends thereof are used as receiving members 26.

Further, a rib 27 is provided so as to protrude from the center of the back surface of the main body of the mirror support frame, and a screw receiving portion 28 is provided at an end of the rib 27. Further, substantially L-shaped end flanges 29, 29a are provided at both ends in the width direction of the main body so as to protrude, and the ribs 27 and the two end flanges 29, 29 are provided.
a, and is fixed to the housing 21 by using fixing screws 22.

The lower plate member 35 is fixed to the opening of the main body of the mirror support frame using the set screws 36, 36 with respect to the mirror support frame 25 configured as described above.

Then, the end mirror 10 is inserted between the main body of the mirror support frame 25 and the lower plate 35, and both ends of the end mirror 10 are fixed and held by fixing screws and adjustment screws.

When fixing the end mirror 10, the mirror surface of the end mirror is pressed against fixing screws 37 and 38 provided on the lower plate to perform positioning, and the side surfaces on both sides of the end mirror and the back surface of the mirror surface are Each is pressed and fixed by adjusting screws 30-32.

The center of the mirror surface of the end mirror supported by the mirror holding member as described above is set as the center of light reflection as shown by the rotation center O in FIG. It is set so that light is reflected through the center O portion.

The adjusting screws 30 to 32 are provided, for example, through screw holes that penetrate the main body of the mirror support frame 25, and by adjusting those adjusting screws respectively,
It is configured so that the end mirror can be positioned.

As shown in FIG. 3, two fixing screws 37 and 38 are provided for one end of the end mirror, and two fixing screws 37 and 38 are provided for the other end of the end mirror 10. One fixing screw 38 is provided for the end portion, and the three fixing screws enable positioning of the mirror surface of the end mirror.

Then, in the mirror holding member of the present invention configured as described above, when adjusting the end mirror 10 corresponding to the twist of the image, the adjustment of the end mirror is performed by using the adjustment screws 30 to 32, respectively. Can be performed.

When adjusting the angle of support of the mirror surface by the end mirror provided on the mirror holding member, the fixing screw 46 shown in FIG.
The mirror is rotated about 26, and then the fixing screw 46 is tightened again to fix the mirror holding member.

The mirror holding member of the present invention configured as described above,
In addition to being provided in the optical device of the laser printer as shown in FIG. 4, the present invention can also be applied to an ordinary document scanning type electronic copying machine or the like.

Further, the mirror holding member can be applied to a color printer or the like that writes an image using a plurality of optical paths, in addition to a laser printer or the like using one laser beam, in which case, The position of the mirror can be easily adjusted according to each optical path.

Further, the mirror support frame shown in the embodiment of the present invention can secure its rigidity in addition to providing the rib and the both end flanges to the semi-cylindrical body as shown in the figure. If it is, the arrangement and configuration of the protruding members can be arbitrarily set, and the connection means with the housing and the like can be arbitrarily set.

(Effects of the Invention) Since the end mirror support device of the present invention has the above-described configuration, the device of the present invention has a cylindrical support member for rotating the mirror holding member on the main body frame side. Is provided, the manufacture thereof can be performed easily, and the support mechanism of the mirror holding member can be simplified.

With the configuration as described above, in the end mirror holding member of the present invention, the mirror holding member is rotated with respect to the support frame provided on the frame of the apparatus such as the image forming apparatus, so that the reflection angle of the mirror is adjusted. Adjustment and the like can be easily performed.

Further, the end mirror supported by the mirror holding member of the present invention can be easily adjusted with an adjusting screw with respect to the twisting of the image and the like, and the adjustment work is not troublesome.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of the support mechanism of the mirror holding member of the present invention, FIG. 2 is a side view of the mirror holding member of the present invention,
FIG. 3 is an explanatory view of a mirror supporting means, FIG. 4 is an explanatory view showing a configuration of an optical system device, FIG. 5 is a perspective view of a conventional mirror holding member, and FIG. 6 is another conventional example. It is a perspective view of. Reference numerals in the drawing 1... Laser writing device, 6... Support frame, 10.
End mirror, 15 ... Cylindrical mirror, 17 ... Support groove, 20 ...
... Mirror holding member, 21 ... Housing, 25 ... Mirror support frame, 26 ... Receiving member, 27 ... Rib, 29 ... End flange, 30-32 ... Adjustment screw, 37-39 ... Fixing screw, 40
…… Support frame, 41 …… Support shaft member, 45 …… Long hole, 46
... Fixing screw.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H04N 1/113 H04N 1/04 104A (56) References JP-A-60-53946 (JP, A) JP-A Sho 57-104915 (JP, A) JP-A-63-64014 (JP, A) JP-A-62-254567 (JP, A) JP-A-62-217219 (JP, A) JP-A-3-239271 (JP, A) A) Actually open 1983-23028 (JP, U) Actually open 1988-26176 (JP, U) Actually open, 64-15247 (JP, U) Actually open, 64-9525 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An image forming apparatus configured to write image information by irradiating light output from a laser beam output device to an image carrier through a rotary scanning unit and a plurality of mirrors. In the optical system device, a support frame 40 that has a cylindrical support shaft member 41 protruding inward and has a long hole provided in a portion around the support shaft member and holds a mirror, and a housing 21 A mirror holding member 20 is configured by combining a mirror supporting frame 25 inside the mirror supporting member. The mirror supporting frame 25 is formed of a substantially semi-cylindrical member, holds a mirror on the concave surface side, and supports both ends of a supporting shaft. A lower plate member 35 configured as a receiving portion rotatably abutting against a member 41, and a lower plate member 35 partially provided on the concave surface side of the mirror support frame; and a mirror corresponding to a long hole of the support frame 40. A screw receiving portion 28 provided on the mirror supporting frame side of the holding member 20; a plurality of screw members supporting the mirror supporting frame and the lower plate member; A mirror provided in alignment with a rotation center axis located on the slope, rotating a mirror support frame with respect to the support shaft member, and fixing a screw provided through a long hole of the support frame to the screw receiving portion. A support device for an end mirror, which is fixed to the end mirror.