JPS6061710A - Installing position adjusting device of image forming element - Google Patents

Abstract

PURPOSE:To adjust a position in the axial direction in a state that a shift, an inclination, etc. of a lens optical axis is suppressed to an error of the minimum, by combining an annular groove provided on the outside circumference of a lens barrel, an adjusting hole of a bracket for holding a lens, and an adjusting member rotated from the outside. CONSTITUTION:A lens 1 having an annular groove 3 on the outside circumferential surface of a lens barrel 2 is held by lens holding surfaces 5 crossing in the shape of V to each other, of a lens bracket 4 fixed to a machine frame, adjusted as to its position, and thereafter, clamped by a lens fixing band 6. An adjusting member 8 consists of a lever part 8a fitted to a thin part of a stepped hole 9, and a flange part 8b fitted to an expanded part of the stepped hole 9, and a pin 10 which is eccentric against the lever part 8a and the flange part 8b and engaged to the annular groove 3 of the lens barrel is provided projectingly on the upper face of the flange 8b. When the adjusting member 8 is turned, the pin 10 moves around the shaft core of the adjusting member 8, and the lens 1 engaged to it moves in the optical axis direction by using the lens holding surface 5 as a guide. In this case, the lens barrel 2 does not rotate at all, therefore, its state remains unchanged by adjusting in advance the optical axis shift and the optical axis inclination.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This invention relates to an apparatus for adjusting the mounting position of an imaging element, such as an imaging lens in an exposure aperture system of an electrophotographic copying machine. The mounting position adjustment device for the imaging element (hereinafter referred to as the lens) such as an imaging lens (7) is generally threaded on the outer periphery of the lens barrel, and the bracket for mounting this lens has the above-mentioned A female thread is cut into which the male thread is screwed, and by rotating the lens around its axis, the lens can be moved in the axial direction and the mounting position can be adjusted. Additionally, the lens is secured using a female-threaded ring. In a lens mounting position adjustment fixing device with such a configuration,
The optical axis of the imaging element changes depending on the accuracy of the optical axis of the lens barrel side, the mounting bracket and the ring screw, etc.
Screw accuracy is an important factor in lens mounting accuracy. In addition, when adjusting the position, the lens inevitably rotates, so in the exposure system that uses slit exposure, it is not possible to select and use the best part of the lens, and the lens must be fixed after determining the position. When doing so, there is a disadvantage that the position changes slightly when tightened with a ring.

Purpose The present invention eliminates the above-mentioned drawbacks of the conventional imaging element position adjustment and fixing device, allows fine adjustment of the mounting position of the imaging element, and eliminates the occurrence of errors such as on the optical axis side. less,
Provided is a device for adjusting the mounting position of an imaging element such as a lens, which allows use of the best part of the imaging element without changing the used part of the imaging element even when the mounting position is adjusted when used in a slit exposure optical system. The purpose is to

Configuration The present invention will be described in detail below based on embodiments shown in the drawings.

1 to 5 show an embodiment in which the present invention is applied to an imaging lens of an exposure system of an electrophotographic copying machine.

This is a diagram. FIG. 1 is a longitudinal sectional view of the lens body,
The lens barrel 2 of the lens l is provided with a KIJ-shaped groove 3 on its outer peripheral surface. As shown in FIG. 2, the lens bracket 4 fixed to the machine frame is held by the lens holding surfaces 5 that cross each other in a V shape, and after the position is adjusted 1l-fc, it is held by the lens fixing band 6. Tighten and secure. Reference numeral 7 is a screw for tightening the fixing band.

On the center line of the lens bracket 4, near a position corresponding to the annular groove 3 on the outer periphery of the lens barrel 2 in the optical axis direction,
As shown in FIGS. 2 and 3, a stepped hole 9 is bored, and an adjusting member 8 is pivotally supported in this hole so as to be rotatable with almost no play. As shown in FIGS. 4 and 5, the adjustment member 8 includes a frame portion 8a that fits into the narrow portion of the service hole 9, and
The upper surface of the flange 8b is eccentric with respect to the frame portion 8a and the flange portion 8b and engages with the annular groove 3 of the lens barrel. Pinye 0 is placed protrudingly. A slotted groove is provided on the lower end surface of the frame 8 so that it can be easily rotated with a screwdriver.

Since this device is constructed and generalized as described above, the adjustment member 8
When rotated with a screwdriver, the eccentric pin lO moves around the axis of the adjustment member 8, and moves in the optical axis direction using the lens lfi lens holding surface 5 that engages with it as a guide. At this time, the lens barrel 2 does not rotate at all, so if the optical axis axis and the optical axis side are adjusted in advance, the condition will not change. Installation is done by adjusting the position.
After that, use the fixing bar/drone to tighten and fix the lens in the plane perpendicular to the V-axis around the periphery, so the lens will not move in the optical axis direction from the adjusted position. Limited to the shape of 1. For example, as shown in FIG. 6 D8', the lower end of the frame 11 rotatably fitted in the through hole π provided in the bracket 4 has a knurled knurl 12, and the upper In the case of the configuration of the embodiments described above, a pin 1O may be provided on the end face eccentrically from the axis and engaged with the annular groove 3 of the lens barrel. The width is perforated on the mounting bracket.

It must be smaller than the diameter of the hole for the adjustment element provided.

However, if an eccentric cam is provided as an adjustment member at the upper end of the frame that fits into the hole of the bracket, and the eccentric cam is engaged with both sides of the annular groove to perform all position adjustment, the width of the annular groove is It may be larger than the hole in the bracket.

Effects As described above, according to the present invention, when the lens is fixed and assembled with the bracket, it is possible to adjust the position in the axial direction while minimizing errors such as misalignment and tilting of the lens optical axis. This has the effect of eliminating the need for horizontal registration correction in copying machines and the like. Further, fine adjustments can be easily made.

Furthermore, in slit exposure copying machines, if the -tan lens is adjusted so that its most excellent performance is within the usable range,
Since the lens does not rotate when adjusting its axial position, the range of use of the lens does not change, and the quality is excellent.
You can get a copy image with 0

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a lens according to an embodiment of the present invention, Fig. 2 is a transverse sectional view showing the lens held by a lens bracket and fixed with a fixing band, and Fig. 3 is a part thereof. 4 is a perspective view of the position adjustment member of the embodiment, FIG. 5 is a top view thereof, and FIG. 6 is a side view including a partial section showing another embodiment of the present invention. be. l...Imaging lens (imaging element) 2... Lens barrel 3... Annular groove

Claims (1)

[Claims] In a device for adjusting the mounting position of an image forming element in an exposure optical system such as a copying machine, a 311-shaped groove is provided on the outer periphery of the lens barrel of the image forming element, and a groove is provided in the bracket that holds the image forming element in the radial direction of the image forming element. An adjustment hole is drilled, and an adjustment member having an eccentric projecting protrusion that engages with the annular groove is provided in the adjustment hole so as to be movable once around the axis 6 of the adjustment hole. An imaging element mounting position adjustment device characterized by: