JPH01195415A - Optical base fitting structure - Google Patents

Abstract

PURPOSE:To prevent shifting of the writing position to a photosensitive body and variation of the beam diameter resulting in unsharp by protecting a mirror vibrator from vibrations by means of a vibration proofing member and, at the same time, by providing a vibration proofing member between 1st and 2nd recessed sections so as to control the position of an optical base. CONSTITUTION:An optical beam deflector 13 with a built-in mirror vibrator which deflects an optical beam by swinging a mirror 4, optical base 27 on which the deflector 13 is placed, fixing member 28 which fixes the optical base 27, and vibration proofing member 26 provided between the 1st recessed section 27a formed on the optical base 27 and the 2nd recessed section 28a formed on the fixing member 28 are provided. The mirror vibrator is protected from vibrations by means of a vibration proofing member 25 and, at the same time, the vibration proofing member 26 between the 1st and 2nd recessed sections 27a and 28a is used for controlling the position of the optical base 27. Therefore, shifting of the writing position to a photosensitive body and variation of the beam diameter resulting in unsharp caused by outside disturbances and vibrations transmitted to the mirror vibrator can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Field of Application The present invention relates to optical-based mounting structures suitable for image forming apparatuses such as facsimile machines, copiers, printers, etc. This invention relates to an optical base mounting structure that is optimal for mounting and fixing a light beam deflector for writing on a photoreceptor.

(2) Prior Art Facsimile Image forming apparatuses such as copiers and printers are increasingly using laser beams to write on photoreceptors. In such an image forming apparatus, a rotating polygon mirror, a mirror oscillator, or the like has conventionally been used as an optical deflector for deflecting a laser beam.

In recent years, mirror resonators have come into widespread use while solving a number of problems due to demands for smaller size, lower noise, lower cost, etc. This mirror resonator generally uses a thin insulating substrate made of crystal or the like and having a thickness of about 0.1 to 0.5 mm.

(3) Problems to be Solved by the Invention As mentioned above, the mirror oscillator uses a thin crystal substrate of about 0.1 to 0.5 mm, which causes the mirror oscillator to be susceptible to external interference. The problem is that it is very weak when photographing. In particular, when a mirror oscillator is used in a copying machine that has a motor that rotates the photoreceptor, a motor that drives the scanning optical system that reads the document, etc., the vibrations from these motors, clutches, etc. This can cause the writing position on the photoreceptor to shift or the beam diameter to fluctuate, causing blurring. Therefore, there is a problem that the resolution and contrast are lowered and the image quality is deteriorated.

(4) Means for Solving the Problems The present invention has been made in view of the above-mentioned points.When disturbance vibrations are transmitted to the mirror oscillator, the writing position on the photoreceptor may shift or the beam diameter may vary. In order to achieve this purpose, we have developed a light beam deflector that includes a mirror oscillator that deflects the light beam by rotating and vibrating the mirror, and a light beam deflector that deflects the light beam by rotating and vibrating the mirror. An optical base on which the beam deflector is placed, a fixing member that fixes the optical base, and a barrier disposed between a first recess formed in the optical base and a second recess formed in the fixing member. A vibration isolating member is provided, and the vibration isolating member performs vibration isolation of the mirror resonator, and the vibration isolating member is disposed between the first recess and the second recess to regulate the position of the optical base. It is configured as follows.

(5) Examples Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a perspective view showing an embodiment of an optical base mounting structure according to the present invention.

In FIG. 1, a fixing member 25 is attached to the bottom of the light beam deflector 13, and the fixing member 25 is attached and fixed to an optical base 27. The optical base 27 is fixed to a housing 30, which will be described later in conjunction with FIG. 4, via a vibration isolating member 26 and a fixing member 28. The vibration isolating member 26 is a fixed member 28
By attenuating the disturbance vibration transmitted through the optical beam deflector 13, which will be described later.

The vibration isolating member 26 described above is constructed as shown in FIG.

In FIG. 5(a), a groove 27a and a groove 28a are formed in the optical base 27 and the fixing member 28, respectively (see FIG. 1). Groove 27a and groove 28a are placed at positions facing each other, and vibration isolating member 26 is placed between groove 27a and groove 28a. A metal block 26a and a metal block 2 are provided at the upper and lower parts of the vibration isolating member 26.
6b is attached, and the positions of the optical base 27 and the fixing member 28 are regulated by fitting the metal blocks 26a and 26b into the grooves 27a and 28a.

FIG. 5(b) shows the metal block 2 shown in FIG. 5(a).
Vibration isolating member 26 without 6a and metal block 26b
In the example shown in FIG. 5(b),
The positions of the optical base 27 and the fixing member 28 are regulated by fitting the vibration isolating member 26 itself into the grooves 27a and 28a.

The vibration isolating member 26 is made of urethane-based shock absorbing elastomer (
Viscoelastic polyurethane elastomer) is used, for example "Sorbothane" (manufactured by Sanshin Kosan Co., Ltd., UK B, T
, Company R! or a silicone-based gel-like substance with a penetration degree (JIS 2530-1976-508 load) of 50 to 200, such as α-GEL (manufactured by Cubic Engineering Co., Ltd.), which provides preferable vibration damping properties. There is. In this way, by fixing the light beam deflector 13 on the optical base 27 via the vibration isolating member 26 made of urethane-based shock absorbing elastomer, etc., the fixing member 2
It becomes possible to effectively attenuate disturbance vibrations transmitted from the optical beam deflector 8 to the optical beam deflector 13.

In addition, the fitting of the metal blocks 26a and 26b with the grooves 27a and 28a described above, and the vibration isolating member 2
The fitting between the groove 27a and the groove 28a is performed during the manufacturing and assembly process of the copying machine. This assembly work can be carried out extremely easily since the block and the @ (recess) are fitted together.

Inside the light beam deflector 13, a reflecting mirror 4, a drive coil 5, etc., which will be explained next with reference to FIG. 2, are provided. In FIG. 1, the reflection mirror 4 and the drive coil 5 are shown through an opening 24a provided in a part of the cylindrical housing 24. As shown in FIG.

In FIG. 2, a mirror oscillator 1 is placed on an L-shaped member 3 at the center of a fixing member 2 having a substantially horseshoe-shaped cross section. The horseshoe-shaped fixing member 2 is
The mirror oscillator 1 is covered by a cylindrical housing 24 (see Fig. 1), and the mirror oscillator 1 is
ensure that it is not adversely affected.

The mirror oscillator 1 is composed of a reflecting mirror 4, a driving coil 5, a ligament 6, and a frame part 7. The reflecting mirror 4 and the driving coil 5, which are connected to each other, are fixed to the frame part 7 by the ligament 6. The reflecting mirror 4, drive coil 5, ligament 6, and frame part 7 are made of a single insulating substrate such as a crystal substrate (thickness is 0.1 mm to 0.5 mm).
millimeters) by processing techniques such as photolithography and etching, and then the reflecting mirror 4 is formed on this insulating substrate by processing techniques such as photolithography and etching again. A reflective surface and a coil pattern of the drive coil 5 are formed.

The lower horizontal part of the frame part 7 is placed on the L-shaped member 3, and the left vertical part is attached to the block member 8, and the block member 8 is further attached to the vertical part of the L-shaped member 3. It is fixed to the L-shaped member 3 by being attached. Note that the block member 8 and the L-shaped member 3 can also be formed integrally.

This mirror vibrator 1 is placed in a DC magnetic field formed by an excitation permanent magnet 10 and an excitation permanent magnet 11 provided on the inner peripheral surface of a fixed member 2. When a drive current is supplied to the drive coil 5 from the outside, a torsion torque is generated in the drive coil 5 around the ligament 6, and the connected reflecting mirror 4 rotates back and forth. The period of the reciprocating rotation of the reflecting mirror 4 is determined by the frequency of the drive current supplied to the drive coil 5, and the deflection angle is determined by the amplitude of the drive current. Therefore, by irradiating the reflection mirror 4 with a laser beam from the lower right side in FIG. 2, the laser beam is deflected as will be described later with reference to FIG.

The L-shaped member 3 for fixing the mirror vibrator 1 is attached to a vibration isolating material 12 which is also formed in an L-shape. Vibration isolation material 1
2, its horizontal portion is connected to the fixing member 2 through the block member 8.
At the same time, the vertical portion is directly bonded to the fixing member 2.

In this way, by interposing the vibration isolating material 12 made of urethane-based shock absorbing elastomer or the like between the L-shaped member 3 that fixes the mirror vibrator 1 and the fixing member 2 (and the block member 9), mirror vibration can be prevented. It becomes possible to attenuate the disturbance vibration transmitted to the element l with a small amount of vibration isolating material.

The light beam deflector 13 described in FIG. 2 is arranged with other optical components as shown in FIG.

In FIG. 3, a laser beam emitted from a semiconductor laser 14 is corrected in beam shape by a collimator lens 15, and then passes through a cylindrical lens 16 and a reflection mirror 17 to a reflection mirror 4 of a light beam deflector 13. is irradiated.

Reflection mirror 4 deflects the laser beam as explained in FIG. The laser beam deflected by the reflection mirror 4 is irradiated onto the photosensitive drum 20 via the scanning lens 18 and the cylindrical lens 19 .

The cylindrical lens 16 and the cylindrical lens 19 are used to correct vertical tilting of the reflecting mirror 4, but can be omitted when the tilting is small. Further, the scanning lens 18 is used for the purpose of scanning the laser beam at a constant speed to form an image at a correct position on the surface of the photoreceptor drum 20. Instead of this scanning lens 18, the scanning lens 18 can be omitted by controlling the waveform of the drive current supplied to the drive coil 5 shown in FIG.

Note that the index sensor 21 and the reflecting mirror 22 in FIG. The end timing is detected.

FIG. 4 is a front view showing an embodiment in which the optical base mounting structure according to the present invention is applied to a copying machine.

In the figure, the same reference numerals are given to the same components as in FIGS. 1 to 3, and explanations thereof will be omitted.

In FIG. 4, the copying machine is arranged as described below.

The copying machine is roughly divided into an image reading system A, a laser writing system B, and an image forming section C1 paper feeding section. The image reading system A is housed in a casing 29, and the other laser writing system B, image forming section C1, paper feeding section, etc. are housed in a casing 30 independent of the casing 29. The image signal read by the image reading system A as described later is sent to the housing 30 via a group of flexible cables.
is supplied to

Further, within the housing 30, with the photosensitive drum 20 in the center, a drive coil 56, a drive coil 57, and a drive coil 58 are arranged on the right side, and a charger 55 and a cleaning device 59 are arranged on the left side. Photosensitive drum 20, drive coil 56
, the drive coil 57, the drive coil 58, the charger 55, and the cleaning device 59 are supported by a supporting member 54 that is removably inserted into the housing 30, or are removably attached to the housing 30.

The copying process by this copying machine is performed as described below.

In image reading system A, a document to be copied is placed on document table 31 . Carriage 3
A reading light is emitted from a halogen lamp 33 attached to the original document, and the reflected light from the original is reflected by a reflecting mirror 34 to the left in FIG.

A movable mirror unit 35 is arranged on the left side of the carriage 32. The movable mirror unit 35 includes a mirror 3
6 and a mirror 37 are attached, and the reading light reflected by the reflecting mirror 34 is reflected by the mirror 36 and the mirror 37 and guided to a lens reading section 40 described later.

The carriage 32 and the movable mirror unit 35 are driven by a wire 49 wound around a stepping motor 48 to horizontally move in the left-right direction in FIG. The horizontal movement of the carriage 32 and the movable mirror unit 35 is set so that when the carriage 32 moves at a speed V, the moving speed of the movable mirror unit 35 is V/2. Even if the lens moves, the optical path length of the reading light from the document surface to the lens reading section 40 remains constant.

The lens reading section 40 includes a lens 41, a prism 42, a first reading board 44, a red channel CCD 45, a second
It is composed of a reading board 46 and a cyan channel CCD 47, and the above-mentioned reading light is converted into an image signal here.

The reading light guided to the lens reading section 40 passes through the prism 42
The images are focused by a dichroic mirror (not shown) in the prism 42 and separated into a red channel image and a cyan channel image.
The image is formed on the light receiving surface 7 and converted into an image signal.

Red channel CCD45 and cyan channel C
From the image signal output from the CD 47, a color signal separated according to the color of the toner used is extracted and supplied to a laser writing system B, which is an exposure means.

In laser writing system B, the optical base 2 shown in FIG.
7 is fixed to the housing 30. The optical base 27 forms a housing, and includes the light beam deflector 13 and cylindrical lens 19 described in FIG. 3, and a reflection mirror 23 for changing the direction of the laser beam deflected by the reflection mirror 4. It is provided inside 27. In the configuration described in FIG. 3, the semiconductor laser 14, the light beam deflector 13, the cylindrical lens 19, and the like other than the photosensitive drum 20 are all housed inside the optical base 27.

As explained in FIGS. 2 and 3, the laser beam is deflected in the light beam deflector 13, and the reflection mirror 2
After the direction is changed in step 3, the photosensitive drum 20 is irradiated.

The photoreceptor drum 20 is charged in advance by a charger 55, and a latent image is formed around the photoreceptor drum 200 by being irradiated with a laser beam. Irradiation of the laser beam onto the photosensitive drum 20 is performed as described below.

When scanning of the laser beam by the reflecting mirror 4 explained in FIGS. A color signal of 1 (in this case, red) is supplied to a laser writing system B, which is an exposure means. by this,
Modulation of the laser beam with the first color signal begins.

The modulated laser beam is deflected by the semiconductor laser 14 and scans the circumferential surface of the photoreceptor drum 20 . Along with the main scanning of the laser beam by this semiconductor laser 14,
Sub-scanning is performed by rotationally driving the photoreceptor drum 20 by a motor (not shown), and a latent image for the first color signal (red) is formed on the circumferential surface of the photoreceptor drum 20.

The latent image on the photosensitive drum 20 is developed by a drive coil 56 loaded with red toner, and the latent image on the photosensitive drum 200 is developed by a drive coil 56 loaded with red toner.
A toner image is formed on the surface. The obtained red toner image passes under the cleaning device 59 while being held on the surface of the photosensitive drum 20, and enters the next copy cycle.

In the next copy cycle, the photoreceptor drum 20 is moved to the charger 5.
5 and then the cyan channel CC
A second color signal (blue in this case) color-separated from the image signal output from the D47 is supplied to the laser writing system B, which is an exposure means.

This starts modulating the laser beam with the second color signal. The modulated laser beam is deflected by the semiconductor laser 14 and scans the circumferential surface of the photoreceptor drum 20 . Along with the main scanning of the laser beam by the semiconductor laser 14, the photoreceptor drum 20 is rotationally driven by a motor (not shown) to perform sub-scanning, and a second color signal (blue) is applied to the circumferential surface of the photoreceptor drum 200. The latent image is the shape.

It will be accomplished.

The latent image on the photoreceptor drum 20 is developed by a drive coil 57 loaded with blue toner, and a toner image is formed on the surface of the photoreceptor drum 20. This blue toner image is formed on top of the red toner image already formed on the photoreceptor drum 20. The obtained blue toner image passes under the cleaning device 59 while being held on the surface of the photosensitive drum 200, and then enters the next copy cycle.

In the next copy cycle, a black toner image is formed in the same manner as the red and blue toner images described above. The development at this time is performed by the drive coil 58 loaded with black toner.

AC and DC bias voltages are applied to the sleeves 56a1, 57a1, and 58a of each of the drive coils 56, 57, and 58, and jumping development using a so-called two-component developer is performed. Therefore, development is performed without contacting the grounded photosensitive drum 20.

A three-color image consisting of a red toner image, a blue toner image, and a black toner image formed on the photoreceptor drum 20 is transferred to the transfer pole 6.
At 0, the image is transferred to recording paper (not shown). The recording paper is transported from the paper feed section to a paper feed belt 61 and a paper feed roller 62.
Powered by.

The recording paper onto which the toner image has been transferred is separated from the surface of the photoreceptor drum 200 by a separation electrode 63, and transferred to a conveyor belt 64.
The paper is transported to the fixing device 65 via the fixing device 65, where fixing is performed.

After fixing, the recording paper is ejected from the machine and the series of copying operations ends. At this time, the blade 59a and roller 59b of the cleaning device 59 remove the toner remaining on the photosensitive drum 20 in preparation for the next copying process.

When the mirror oscillator 1 is used in such a copying machine,
The above-mentioned stepping motor 48 and photosensitive drum 2
Vibrations and shocks from the motor driving the 0, clutch, gears, etc. cannot be avoided. however,
According to the optical base mounting structure according to the present invention, the vibration isolating member 26 made of urethane-based shock absorbing elastomer or the like is connected to the stepping motor 48 that is transmitted to the mirror vibrator 1 via the fixing member 28, the motor that drives the photoreceptor drum 20, etc. By attenuating the vibrations from the photoreceptor drum 20, the writing position on the photosensitive drum 20 is prevented from shifting, and the beam diameter is also prevented from fluctuating and causing blurring.

Although the present invention has been described above using examples, various modifications are possible according to the technical idea of the present invention. For example, in the embodiment described above, the optical base 27 and the fixing member 28
Although the case where the grooves 27a and 28a are formed respectively has been described, the grooves are not limited to grooves, and may be circular or rectangular recesses.

Furthermore, although the vibration isolating member 26 shown in FIG. 5(b) has been described as having a rectangular cross section, the portions corresponding to the metal blocks 26a and 26b shown in FIG. 5(a) are It can also be formed integrally with an elastic member.

(6) Effects of the Invention As explained above, the present invention provides a light beam deflector incorporating a mirror oscillator that deflects a light beam by rotating and vibrating a mirror, and an optical beam deflector on which the light beam deflector is mounted. A base, a fixing member for fixing the optical base, and a vibration isolating member disposed between a first recess formed in the optical base and a second recess formed in the fixing member are provided. The member provides vibration isolation for the mirror oscillator, and the first recess and the second recess
Since the vibration isolating member is disposed between the recess and the optical base, the position of the optical base is regulated.As a result, disturbance vibrations are transmitted to the mirror oscillator, and the writing position on the photoreceptor is adjusted. It is possible to prevent the beam from shifting or changing the beam diameter, causing blur.

Furthermore, by preventing the writing position on the photoreceptor from shifting and the beam diameter from fluctuating, it is possible to prevent image quality from deteriorating due to a decrease in resolution, a decrease in contrast, or the like.

Furthermore, since the work of arranging the vibration isolating member between the first recess and the second recess involves fitting the vibration isolating member and the recess, the position of the optical base can be regulated by an extremely easy morning stand-up operation. be able to.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the optical base mounting structure according to the present invention, FIG. 2 is a perspective view showing the inside of the light beam deflector shown in FIG. 1, and FIG. FIG. 4 is a plan view showing an embodiment in which the mounting structure of the optical base shown in FIG. 1 is applied to a copying machine; FIG. Figure 5 shows the vibration isolating member 2 shown in Figure 1.
6 is a side view illustrating the optical base 27 and the fixing member 28. FIG. l...Mirror vibrator 2...Fixing member 3...L-shaped member 4...Reflection mirror δ...Drive coil 6...Ligament 7 -Φ・Url frame Part 8... Block member 9... Block member 10... Permanent magnet for excitation 11... Permanent magnet for excitation 12... Vibration isolating material 13... Light beam deflector 14...Semiconductor laser 15...Collimator lens 16...Cylindrical lens 17...Reflection mirror 18...Scanning lens 19-...Cylindrical lens 20...Photosensitive Body drum 21 ... ◆ Index sensor 22 ... Reflection mirror 23 ... Reflection mirror 24 ... Cylindrical housing 25 ... Vibration isolating material 26 ... Vibration isolating member 27 ... ...Optical base 28 ...Fixing member

Claims (1)

[Claims] A light beam deflector incorporating a mirror oscillator that deflects a light beam by rotating and vibrating a mirror, an optical base on which the light beam deflector is placed, a fixing member for fixing the optical base, and the optical base. and a vibration isolating member disposed between a first recess formed in the fixing member and a second recess formed in the fixing member, and the vibration isolating member provides vibration isolation for the mirror oscillator. In addition, the optical base mounting structure is characterized in that the position of the optical base is regulated by disposing the vibration isolating member between the first recess and the second recess.