JPS62177521A - Optical scanner - Google Patents

Abstract

PURPOSE:To attain the correction of an optical axis within a short period by adjusting the position of a scanning light reflecting member for guiding scanning light to a prescribed image formation surface from the external to a base storing a scanner. CONSTITUTION:A mirror holding member 29 fitting a reflecting mirror 28 is freely rotatably pivoted 30 on one position of a side plate 9 of the base 6. The shaft 34 of a center deviation pin 32 is screwed 36 into the side plate 9 and locked on the outside part of the side plate 9 with a snap ring so as not to be dropped. When the pin 32 is rotated by a driver or the like, the pin 32 is rotated in the same direction as the shaft 34, the eccentric part of the pin 32 is abutted and pressed upon/against the holding member 29 and to holding member 29 also is rotated around the pivoting part to adjust the scanning light in the rotating angle direction. The holding member 29 is vertically moved with inclination and the mirror 29 is also moved with inclination, so that the optical axis of the incident light L is corrected and formed on a correct position of a photosensitive drum through a hole part 27. Consequently, the optical axis deviation adjusting time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The invention of this application relates to an optical scanning device. More specifically, the present invention relates to an adjustment configuration of a scanning light reflecting member that guides scanning light onto a predetermined image forming surface.

(Prior Art) Optical Scanning Device First, this conventional example will be explained with reference to the accompanying drawings. In FIG. 4, the F side of the optical case 4 fixed on the base 2 is usually covered by a cover (not shown). A laser light source 8 is attached to one side of the optical case 4, and a polygon mirror 10 housed within the case 4 is an optical deflector that scans the laser light emitted from the laser light source 8.
Laser light source 8 via imaging lens groups 12, 14, 16
The laser beam irradiated from the photosensitive drum 24 is finally imaged on the photosensitive drum 24 via a member disposed in the middle, as will be described later. The ItJI signal reflection mirror 18 reflects the laser beam scanned by the polygon mirror 10 on a straight curve that scans the image forming area of the photosensitive drum 24, and receives the light of the horizontal synchronization signal detection device described later. This light receiving element 20 is provided inside the optical case 4 facing the reflecting mirror 18, and the light receiving element 20 is provided to face the reflecting mirror 18.
8Receive the reflected laser beam. The received light is photoelectrically converted into a horizontal synchronization signal. After this horizontal synchronization signal is detected, when the laser light source 8 is started to be driven by the recorded information signal, the laser light modulated according to the information signal is applied to the photosensitive drum 24F by the scanning light reflecting mirror 28 attached to the reflecting member. It is reflected, passes through two slit holes 26 and 27, and a static Ti, Wr image is formed on the photosensitive drum 24.

The present invention relates to an improvement of a reflecting section to which a scanning light reflecting mirror 28 is attached, which is used in the optical scanning device.

(Problems to be Solved by the Invention) The scanning light reflecting member used in the conventional example is usually of a fixed type, and therefore the scanning light is reflected only in one direction at an appropriate angle. However, optical scanning devices are assembled from various components, and when these components are recombined or replaced, variations occur in the placement positions of each component, which causes the optical axis of the scanning light to change. As a result, the scanning light may deviate from a predetermined position on the imaging member 2, and in severe cases, it becomes impossible to form an image.

(Means for Solving the Problem 1) An object of the present invention is to provide a configuration that enables optical axis correction by adjusting the position of a reflecting mirror that is a reflecting member for scanning light. To achieve this purpose, a member for adjusting the position of the reflective mirror is brought into contact with a reflective mirror holding member through a hole provided on the side surface of the optical case, and this adjusting member is operated from outside the optical case to adjust the holding member. By displacing the mirror, it is possible to correct the optical axis of the reflective mirror attached to it.

Since this reflection mirror position adjustment member can be operated from outside the optical case, there is no need to remove the cover member of the optical case for optical axis correction, which is extremely convenient.

(Example) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 6 denotes a base from which the base 2 of the conventional example is removed and the optical case is made of a rigid member having an H-shaped cross section instead. Related members of the optical scanning device are housed in a space formed above the intermediate partition 7 of the base 6, and drive and control circuits are housed in a space formed below. This configuration is not related to the present invention, so a description thereof will be omitted. A mirror holding member 29 with one reflecting mirror 28 attached to one location on the side plate 9 of the base 6 is rotatably supported. The shaft 34 of the centering pin 32 is screwed 36 into the side plate 9, and a retaining ring 4 is attached to the outer side of the side plate 9.
At 0, the puller is locked to prevent it from falling. The misalignment pin 32 is provided so as to be able to come into contact with the holding member 29. Therefore, when a screwdriver or the like is applied to the misalignment pin 32 and it is rotated, the misalignment pin 32 and @h34 rotate in the same direction, and the eccentric portion of this pin comes into contact with the holding member 29 and presses it. The holding member 29 also rotates about the shaft support and adjusts the scanning light in one rotation angle direction. The holding member 29 tilts, for example, in the vertical direction (toward FIG. 1). Therefore, the reflective mirror 28
Also tilt accordingly.

The optical axis of the incident light is corrected, and the light passes through the hole 27 to the photosensitive drum 2.
4. Focus the image on the correct position.

FIG. 3 shows another embodiment in which a pair of misaligned pins 42 are rotatably disposed in contact with a holding member 29, and a reflecting mirror 2
8 is configured to be pressed in the direction of the misalignment pin 42 against the arcuate elastic member 38 provided on the base 37. Reference numeral 46 denotes a support pin of the holding member, which is pivotally supported by the base side plate 9. The above-mentioned structure is arranged at both ends of the reflective mirror holding member.

By rotating the misalignment pin 42 from outside the base 6 of the optical scanning device using a screwdriver or the like, the arc-shaped elastic member 38 is used as a fulcrum in the direction of rotation angle, and due to the deformation of the elastic member 38, it moves up and down against this rotation. The position of the reflecting mirror 28 together with the holding member 29 pivotally supported by the support bin 46 is
Adjustable in three dimensions.

(Effects) With the device of the present invention, when assembling an optical scanning device and replacing each element, the scanning light emitted from the neck at a predetermined position on the imaging plane can be easily and accurately directed to a predetermined position. 1 Optical axis deviation: This has the effect of shortening the A adjustment time.

[Brief explanation of drawings]

Figure 1 shows the position of the reflection mirror of the optical scanning device according to the present invention!
! ! ! FIG. 3 is a cross-sectional view of an embodiment of the mechanism. Figure 2 is a cross-sectional view of another route. FIG. 4 is a perspective view of the neck of a conventional optical scanning device. 6... Base, 7... Partition section, 9... Side plate, 18.
... Reflection mirror, 29... Holding member, 30... Pivotal support,
32... Misalignment pin, 34... Shaft, 38... Elastic member, 42... Misalignment pin, 46... Support bottle (holding member) Patent applicant Kopal Electronics Co., Ltd. Agent Patent attorney Kobayashi Sakae≦zf, book a (
(No change in content) Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment dated March 72, 1985 1. Indication of case 1988 Patent application No. 019279 2. Title of invention Optical scanning device 3. Relationship with the case of the person making the amendment Patent Applicant: Eisho Tokyo, I is father-in-law, No. 17-1 Name: Kobal Electronics Co., Ltd. 4, Agent: 160 Name (7510) Patent attorney Sakae Kobayashi Phone: 374-5890 5. Date of amendment order

Claims (1)

[Scope of Claims] 1. In an optical scanning device equipped with a reflecting member that guides scanning light onto a predetermined image forming surface, position adjustment of the scanning light reflecting member that guides scanning light onto a predetermined image forming surface is An optical scanning device characterized in that it can be carried out from outside a base that houses the device. 2. The optical scanning device according to claim 1, further comprising a support member for the optical scanning reflection member that rotates around the shaft supporting member. 3. The optical scanning device according to claim 2, further comprising a misalignment pin that can come into contact with the holding member of the optical scanning reflection member and rotate the holding member at a predetermined angle by its operation. 4. An elastic member is disposed on the opposite side of the reflective mirror holding member to which the misalignment pin can abut, so that the reflective mirror attached to the holding member can be pressed by elastic force. The optical scanning device according to item 3.