JPS6015620A - Scanner - Google Patents

Abstract

PURPOSE:To improve the simplicity of shape, the resistance to environment, and the replaceability of a scanning motor by providing an attaching seat of optical parts parallel with a motor shaft in the second casing including the scanning motor having the first casing. CONSTITUTION:The second casing 22 is fixed to a lens house 21 by a screw 23 and has a scanning motor M24 internally, and the motor M24 has the first casing 25 and incorporates a rotary mirror 28. An attaching seat 42 consisting of an attaching hole 40 of a collimator lens 39 as optical parts and an attaching face 41 is formed on the side face, which is adjacent to the side face in the scanning direction of the casing 22, in parallel with a revolving shaft 27 of the motor M24 with high precision, and the collimator lens 39 is attached similarly to an f.theta lens 35. Since the lens 35 and the collimator lens 39 are attached to the casing 22, the shape of the casing 25 is simplified, and the attaching error between lens systems is reduced to make the device compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scanning device used, for example, in a radar printer or the like.

[Technical background of the invention and its problems]

For example, in a laser printer, as shown in FIG. Some devices are equipped with a scanning device 7 that allows the light to be incident on the photosensitive drum 6. In the figure, 8 is a charging device, 9 is a developing device, and 10 is a transfer device a, x.
An xFi peeling device, 12 a cleaning device, 13 a paper feed cassette, 14 a transfer path for transfer paper P, 15 a fixing device, and 16 a paper discharge tray.

By the way, in the above-mentioned scanning device 7, the f/θ lens 5 can be attached directly to the scan motor casing 11 as shown in FIG. I try to support them. However, in the former case, the scan motor casing 17 is very complicated, and it is difficult to replace the scan motor 2 when it breaks down. In the latter case, although the motor cable song 1 itself becomes simple, the distance from the laser polarization point to the f/theta lens 5 generally becomes longer, so l) the t/theta lens 5 becomes larger. and installation errors are likely to occur.

Moreover, as shown in FIGS. 2 and 3, K.

Since the collimator lens 18 and the like are separated from the motor casing 17, adjustment becomes difficult.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and aims to enable optical components to be mounted accurately and easily, to simplify the shape of the casing of the scan motor, and to provide environmental resistance. Another object of the present invention is to provide a scanning device in which the replaceability of the scan motor is improved.

[Summary of the invention]

The present invention includes a scan motor having a first casing, a second casing that entirely includes the scan motor,
This second casing is characterized in that it includes a mounting seat for an optical component provided parallel to the motor shaft.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. 21 in FIGS. 4 and 5 is a housing space (or lens house). This housing pace 21
An outer casing 22 serving as a second casing is fixed to the outer casing 22 by screws 23, and a scan motor 24 is housed inside the outer casing 22. The scan motor 24 has a motor casing 25 as a first casing, and also has a built-in polygon mirror (rotating mirror) 26 supported on a rotating shaft 27 . Then, it is fitted into a guide base 28 provided at the inner bottom of the outer casing 22 and fixed with screws. In this state, the bottom of the scan motor 24 is inserted through the hole 29 provided on the bottom surface of the outer casing 22 and the hole 3oK provided on the housing spacer 21. Further, the guide pace 28 is set so that the height of the optical path of the entire neck is at an appropriate position in the thickness direction of the polygon mirror 26, and the hole 2 provided in the bottom surface of the outer casing 22 is
9 is sealed. Furthermore, the original port 31 is provided in the motor casing 25 of the scan motor 24.

Further, the upper surface of the outer casing 22 is open,
A cover 33 is attached to this opening 32 with screws 34 . . . K to maintain airtightness and prevent light leakage. The outer casing 22 is formed into a rectangular shape when viewed from the direction of the rotating shaft 27 of the hexagonal motor 24, and has a mounting hole 36 and a mounting hole 36 on the side surface in the optical scanning direction for mounting an f/θ lens 35 as an optical component. Mounting seat 38 consisting of mounting surface 37
is formed parallel to the rotating shaft 27 of the scan motor 24 with high accuracy. Then, the f/θ lens 35 is
The height position is set by the mounting hole 36, and the distance from the reflecting surface of the polygon mirror 26 is set by the side surface in the scanning direction. Further, on a side surface of the outer casing 22 adjacent to the side surface in the scanning direction, a mounting seat 42 consisting of a mounting hole 40 and a mounting surface 4 for mounting a collimator lens 39 as an optical component is provided on the rotation shaft 27 of the scan motor 24. The collimator lens 39 is formed parallel to the f/θ lens 35 with high precision.
It will be installed in the same way. Note that 43 is a bin for positioning the outer casing 22 so that its side surface in the scanning direction is orthogonal to the original optical axis passing through the f/θ lens 35.

According to the above configuration, since the f/theta lens 35 and the collimator lens 39 are attached to the outer casing 22, the shape of the motor casing 25 is simplified, errors in attaching the lens systems to each other are reduced, and the lens system becomes compact.

In addition, the motor casing 25 and the outer casing 22
Since it has a double-sealed structure, it is possible to reduce the influence of the push rods, etc. on the motors 2 and 4, and the wind noise of the motor 24, especially the polygon mirror 26, due to high speed rotation, noise of the bearings, etc. Moreover, it is less affected by temperature, humidity, etc.

Furthermore, in the event of a failure of the scan motor 24, it can be replaced with another motor by replacing the guide pace 28.

Further, even during transportation, deterioration in accuracy can be prevented by separating these units.

Furthermore, since the outer casing 22 is made rectangular, f・θ
Mounting seat 311 for lens 35 and correlator lens 39
．． 42 is easy to form and easy to assemble. Moreover, it can be easily incorporated into a laser printer or the like.

Furthermore, since it is unitized, evaluation tests can be performed and inspections before installation become easier.

Note that a hole 29.30 through which a part of the scan motor 24 is inserted is formed in the outer casing 22 and the guide pace 28, but this hole 29.30 may not be provided depending on the shape of the motor, and in this case, More airtightness is maintained.

In addition, when incorporating a scan motor that uses a dynamic pressure bearing to improve motor accuracy and rotation speed, the effects of temperature shock, humidity, and minute dust may be noisy, and desiccant and filters must be installed inside the outer casing 22. The impact can be minimized by adding

Furthermore, when a semiconductor laser is used as a light source, the semiconductor laser can also be attached to the outer casing 22, making it easier and more accurate to assemble the tear.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a scan motor having a first casing, a second casing that includes the scan motor, and an optical component provided in the second casing in parallel with the motor axis. Equipped with a mounting seat, optical components can be mounted accurately and easily, the shape of the scan motor casing can be simplified, and environmental resistance and scan motor replaceability are improved. It has a great effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view schematically showing a laser printer, Fig. 2 is a plan view showing a conventional example, Fig. 3 is a plan view showing another conventional example, and Figs. 4 and 5 are parts of the present invention. FIG. 4 is a partially cutaway plan view, and FIG. 5 is a partially cutaway side view, showing an embodiment. 22... second casing (outer casing), 24
...Scan motor, 25...First casing (
motor casing), 2y... rotating shaft, 3596. Optical parts (f/θ lens), 38...Mounting seat, 39...
・Optical parts (collimator lens), 42...Mounting seat. Applicant's agent Patent attorney Takeshi Suzue Hikoyoko 1 Figure 3 IP4151 Spy 5f! 1

Claims (1)

[Claims] α) A scan motor having a first casing, a second casing containing the scan motor, and a mounting seat for an optical component provided in the second casing in parallel with the motor axis. A scanning device comprising: 0) The scanning device according to claim 1 or 2, wherein the optical component is an f/θ lens, a collimator lens, etc. The scanning device has a rectangular shape when viewed from the axis of rotation according to claim 1.