JP3199865B2 - Optical system housing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for accommodating a scanning optical system used in a laser printer or the like.
More specifically, the present invention relates to a structure of a housing formed by a mold and having a mounting seat for a reflection mirror.

[0002]

2. Description of the Related Art For example, a scanning optical system used in a laser printer or the like includes a light source for generating optical information, an optical deflector for scanning and deflecting a light beam from the light source, and a light beam deflected by the optical deflector. The optical system is composed of an fθ lens that corrects the scanning speed of the lens constantly, a correction lens that corrects optical characteristics such as astigmatism, and a reflection mirror that bends the light beam. To be housed. A photosensitive drum to be scanned is arranged on one surface side or the other surface side of the housing, and the light beam scanned and deflected by the polygon mirror is bent by the reflection mirror and irradiated on the surface of the photosensitive drum. Then, drawing is performed.

In such an optical system, the mounting of the reflecting mirror is performed through a mounting seat facing the photosensitive drum side in the housing, and in many cases, a plurality of screws or a combination of a spring and a screw is used. The angle of the anti-slope surface is adjustable. Many of the housings are made of synthetic resin and are molded by injection molding or the like, and the mounting seat of the reflection mirror is formed integrally with the housing when the housing is molded.

[0004]

On the other hand, in the laser printer, the positional relationship between the photosensitive drum and the housing differs depending on the specification, and the orientation of the mounting seat changes accordingly.
Conventionally, a mold is manufactured each time according to the specifications of a laser printer, and therefore, there has been a problem that the cost cannot be reduced. The present invention has been devised in view of the above circumstances, and an object of the present invention is to enable a housing to be formed using a single mold even when the orientation of the mounting seat of the reflection mirror is different, thereby reducing cost. It is an object of the present invention to provide a housing structure of an optical system which can achieve the following.

[0005]

In order to achieve the above object, the present invention provides a housing containing an optical system for scanning and deflecting a light beam, wherein the optical system comprises the optical system for scanning and deflecting the light beam. And a reflection mirror configured to irradiate the object to be scanned disposed outside the housing, wherein the housing is formed by a mold, and the housing has a different orientation with respect to one reflection mirror. At least two reflecting mirror mounting seats are formed integrally with the housing, and the reflecting mirror is mounted on one of the two reflecting mirror mounting seats according to the position of the scan target. It is characterized by being able to.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a housing for accommodating a scanning optical system used in a laser printer will be described below. FIG. 1 is a plan view of a housing that houses a scanning optical system.
Light source 3, optical deflector 5, fθ lenses 7, 9, correction lens 1
1, an optical system including a reflection mirror 13 is accommodated. The reflecting mirror 13 is formed with a predetermined length corresponding to the scanning direction, and both ends in the longitudinal direction are shown by AA in FIG.
As shown in FIG. 3 in a sectional view taken along the line BB in FIG. 1, the first mounting seat 15 or the second mounting seat 17 of the housing 1 is shown.
Attached through. First and second mounting seats 15,
Numerals 17 are formed at different intervals in the optical axis direction in different directions so as to bend the light beam in the directions of the upper surface 1A and the lower surface 1B of the housing 1.
17 is formed integrally with the housing 1 when the housing 1 is formed.

In this embodiment, since the photosensitive drum is arranged on the lower surface 1B side of the housing 1, the reflecting mirror 13 has its reflecting surface 13A obliquely downward as shown by a solid line in FIGS. Installed. More specifically, one end of the reflection mirror 13 is connected to the first mirror as shown in FIG.
Projection 150 formed on first slope 1501 of mounting seat 15
3, the second slope 1505, and the leaf spring 21 attached with the screw 19. As shown in FIG. 3, the other end of the reflection mirror 13 is secured by a third slope 1507 of the first mounting seat 15, a projection 1509, a head of an adjusting screw 23 screwed to the housing 1, and a screw 24. Plated leaf spring 2
5, the angle of the reflecting surface 13A is adjusted by rotating the adjusting screw 23. Then, the light beam is bent by the reflection mirror 13 as shown by the center line (a), and is emitted from the window 27 to the photosensitive drum side.

In a laser printer in which the photosensitive drum is disposed on the upper surface 1A side of the housing, as shown by phantom lines in FIGS. 1 to 3, the reflecting mirror 13 is mounted with the reflecting surface 13A obliquely upward. That is, as shown in FIG. 2, one end of the reflection mirror 13 has a protrusion 1703 formed on the first slope 1701 of the second mounting seat 17 and a second slope 170.
5 and a leaf spring 21 attached with screws 19. As shown in FIG. 3, the other end of the reflection mirror 13 is connected to a third slope 1707 of the second mounting seat 17 and a projection 170.
9, the head of the adjusting screw 23, and a leaf spring 25 attached by a screw 24. Similarly to the case of the first mounting seat 15, the adjusting screw 23 is rotated to form the reflecting surface 13A. The angle is adjusted. Then, the light beam is bent by the reflection mirror 13 as shown by the center line (b), and is irradiated on the photosensitive drum on the upper surface 1A side of the housing 1.

In the laser printer of the specification in which the photosensitive drum is arranged on the lower surface 1B side of the housing 1, the reflecting mirror 13 is connected to the housing 1 via the first mounting seat 15, since the present embodiment is configured as described above. In this case, a light beam can be irradiated on the photosensitive drum to perform drawing. Further, in a laser printer of a specification in which the photosensitive drum is arranged on the upper surface 1A side of the housing 1, by attaching the reflection mirror 13 to the housing 1 via the second mounting seat 17, a light beam is irradiated on the photosensitive drum to draw. Can do it. Therefore, the upper surface 1A or the lower surface 1 of the housing 1
The housing 1 can be used in common for both laser printers of the specification in which the photosensitive drum is arranged on B. Therefore, a single mold can be used for laser printers with different specifications, and it is not necessary to manufacture expensive housing dies for each different specification each time, so that the cost of the laser printer can be reduced.

[0010]

As is apparent from the above description, according to the present invention, at least two reflecting mirror mounting seats having different directions with respect to one reflecting mirror are formed integrally with the housing, and the scanning is performed. According to the position of the target, the reflection mirror is mounted on one of the two reflection mirror mounting seats. Therefore, even when the position of the scanning target is different depending on the specification, the housing can be handled by a single mold, and it is not necessary to manufacture a housing mold each time, and the cost of the optical system housing can be reduced. Become.

[Brief description of the drawings]

FIG. 1 is a plan view of a housing containing a scanning optical system.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1A Upper surface of housing 1B Lower surface of housing 13 Reflecting mirror 15 First mounting seat 17 Second mounting seat 21, 25 Leaf spring 23 Adjustment screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 26/10 B41J 2/44

Claims (1)

(57) [Claims] 1. A housing housing an optical system for performing scanning deflection of a light beam, wherein the optical system bends the scanning-deflected light beam,
A reflection mirror configured to irradiate an object to be scanned disposed outside the housing, wherein the housing is formed by a mold; and the housing includes at least two reflection mirrors having different directions with respect to one reflection mirror. Mounting seat is housing
And the reflection mirror is formed integrally with the mirror according to the position of the scanning object.
One of the reflection mirror mounting seats
A housing structure for an optical system, wherein the housing structure is attached to a mounting seat for an optical system.