JPS60172013A - Synchronizing detecting device - Google Patents

Abstract

PURPOSE:To adjust safely and easily a write start position without using an electric means by constituting the titled device so that a synchronizing detecting device for generating a synchronizing signal in accordance with a scan of laser light can be moved and adjusted in the scanning direction from the outside of a housing to which a laser light source and a scanning means have been installed. CONSTITUTION:A synchronizing detecting device 10 is installed with adjusting screws 12, 13 through long holes 1a, 1b from the outside of a housing 11 containing a laser light source and a scanning means. Laser light Lb from a laser light source unit 20 installed to the wall part of the housing 11 transmits through a cylindrical lens 22 and an aperture 23, also is reflected by plane mirrors 24, 25, goes toward a hologram lattice disk 26 at a prescribed incident angle, and is made incident on one of hologram diffraction gratings. Thereafter, it is reflected by a plane mirror 27, focused onto a photosensitive body 32 through an ftheta lens 28, plane mirrors 29, 30 and a lens 31, displaced linearly on a surface to be scanned as the disk 26 rotates, and executes a main scan to the surface to be scanned. Also, an adjustment of a write position is executed by loosening the screws 12, 13 from the outside of the housing 11 and moving the synchronizing detecting device 10 by a necessary quantity on the main scanning direction X-X.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Part! i!f) The present invention relates to a synchronization detection device, and more particularly to a synchronization detection device that can be applied to a laser recording device.

(Prior art) Conventionally, a laser beam modulated by image information is scanned onto a photoconductive photoreceptor to obtain an electrostatic latent image, and this latent image is developed.
□□・Laser recording devices that obtain recorded images by transfer or the like are known.

In such a laser recording device, the scanning direction at any position on the optical path of the scanning light by the rotating polygon mirror or holo scanner is called the main scanning direction, and the direction on the photoconductor perpendicular to the main scanning direction is called the sub scanning direction. In other words, by combining the feeding of the photoreceptor in the sub-scanning direction and the scanning of the laser beam in the main scanning direction, which is turned on and off according to the image quality information, one recording image consisting of a collection of many dots is created. You will get it.

Here, in order for an image to be formed, the writing start position of each traveling line must be at least constant on the photoreceptor. After some time, an operation is performed to include image information in the laser light.

In this way, the image is formed by controlling the writing start position to be constant for each scanning line, but furthermore, if the position of the image on a single sheet of recording paper is shifted as a whole, There is.

This is mainly due to errors in manufacturing and assembling the parts, such as the mounting position of the paper feed unit being deviated from the intended position, or the position of the photodetector being misaligned. .

A conventional method for adjusting the image position on recording paper is to vary the delay time from the generation of a detection signal by a photodetector to the start of printing by electrical operation. However, this requires a delay line, a counter, and a complicated control circuit.

Further, as another conventional technique, there is an example in which a synchronization detection device is provided inside a housing in which a scanning means is provided. However, in this example, it is necessary to open the lid of the housing and move and adjust the synchronization detection device.・Open the lid of the housing and adjust the position of the synchronization detection device while the laser beam is being emitted. is accompanied by difficult constraints from a safety perspective.

(Objective) Accordingly, an object of the present invention is to provide a synchronization detection device that can safely and easily adjust the write start position without using electrical means.

(composition) The structure of the present invention will be described below with reference to an actual winding example.

The synchronization detection device according to the present invention is shown in Fig. 1 in an exploded manner. In the figure, reference numeral 1 indicates an adjustment table. This adjustment table 1 has
Two long holes 1a and ib are formed in the main scanning direction XX. Further, a lens support frame 2 having rectangular hollow portions 2a to 2f is integrally formed.

At the tip of this lens support frame 2, there is a lens attachment 14.
2b is formed, and this lens mounting groove 2b is a cylindrical lens L that forms an image of the Vc laser source on the photo sensor.
1 is attached using a metal fitting 6. A notch 2c formed in the lens support frame 2 is for locking a claw 6a of the metal fitting 5.

A window 3b is formed in the metal fitting 3vc. In addition, each sensor holder 1 and the cylindrical sensor holder 2a integrated therewith are hollow on the extension of the hollow part 2,
Together with the window 6o, it constitutes a path for laser light.

Reference numeral 4 denotes a photosensor, whose collar 4a is held and supported by a sensor holder 2d and a cylindrical fixing base 5a.

Since the fixed base 5a is integrated with the board 5 equipped with a photo-sensing amplifier circuit and a binarization circuit for generating a synchronization signal, the screws 6.7 and the screw base 8 of the adjustment base 1 are
, 9 via the substrate 5, the photosensor 4 is supported. At the same time, adjustment table 1 and board 5
is also integrally constructed.

The synchronization detection device 10 assembled in this way is J-
As shown in FIG. 2, it is attached from the outside of the housing 11 housing the laser light source and the scanning means through elongated holes 1a r Ib k using adjustment screws 12 and 13. That is, case 1
Several examples are possible without removing the lid from step 1.

At that time, the support frame 2 is connected to the opening 11 formed in the housing 11.
It protrudes from ae to the inner bone 1 of the housing 11.

Here, the lens support frame 2 is provided with an X-XIC range in the main scanning direction within the opening 11a for adjustment, and is movable within that range. Note that the area around the opening 11a is the adjustment table 1.
Although there is a gap between the opening 11a and the lens support frame 2, the lid (not shown) that comes into close contact with the seat 11o is attached to the housing. body 11
The inside is designed to be sealed so that no light leaks to the outside.

Here, the laser light source and set meal means attached to the housing 11 will be explained.

As shown in Figure 4, the laser beam Lo from the laser diode of the laser light source unit 20 attached to the wall of the housing 11 is transmitted through a cylindrical lens 22 and an aperture 26 for beam shaping, as shown in Figure 6. , is further reflected by the plane mirrors 24 and 25vc, and is directed toward the hologram grating disk 26 at a predetermined angle of incidence.
It is incident on one of the hologram gratings on the hologram grating disk 26.

The hologram grating disk 26 has a disk shape as shown in FIG. 6, and has a plurality of optically equivalent hologram diffraction gratings 1-1, 1-2, 1-2, 1-1, 2, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 types hologram gratings arranged on one surface of a transparent circular substrate. ...
. . . , 1-i, . . . are arranged in a circular ring. The hologram diffraction grating 1-] is a linear diffraction grating, and is configured as a surface relief hologram, a volume type phase hologram, or the like.

The hologram grating disk 26 is fixedly mounted on the shaft of the motor 36 through the mounting fitting 26aVc, and
It can be rotated by

In Figure j.5, the direction of the grating lines of the diffraction grating in the hologram diffraction grating 1-1 is the A-A line, that is, the straight line connecting the center of the hologram diffraction grating 1-1 and the rotation center of the hologram grating disk 10. is parallel to the direction of

When the laser source LO enters the hologram diffraction grating 1-1, diffracted light is generated by the hologram diffraction grating 1-1. Note that the reference numeral Lb1 in the figure indicates a beam cross section of the incident laser beam. When the hologram grating disk 26 rotates, the direction of the grating lines of the hologram diffraction grating 1-1 with respect to the incident laser beam LoVc rotates, so that the direction of the diffraction yt changes to the peak of the incident position of the laser beam Ll). It changes along the conical surface. Since each hologram diffraction grating 1-1 formed on the hologram grating disk 1 is optically equivalent to each other, when the hologram grating disk 1 rotates, the laser beam Lb
The deflection of the diffracted light is repeated each time the hologram diffraction grating on which the diffracted light is incident is switched.

Now, the diffracted light generated by the hologram diffraction grating 2B is
As shown in Figure 6, after being reflected by the plane mirror 27 placed above the hologram diffraction grating 26, fθ
S/Z28. Plane mirrors 29, 30. The light is focused into a spot through the cylindrical lens 31 onto the photoreceptor 62, which is the surface to be scanned. Then, as the hologram grating disk 26 rotates, the spot-shaped focusing point is linearly displaced on the surface to be scanned, and main scans the surface to be scanned.

In the above, the laser source emitted from the laser light source unit 20? Various members provided to guide the photoreceptor 62 instead of the source to be scanned, that is, members interposed on the optical path/between the cylindrical lens 22 and the cylindrical lens 31, constitute the scanning means, These erosion means are built into the IU inside the housing 11 in order to prevent the laser beam from accidentally leaking outside.
tl Vc is installed.

The outline is as shown in Figure 4, and the plane mirror 60
Directly below the figure, a slit-like opening formed in the housing is installed at a predetermined position in the direction penetrating the page, and a dust-proof glass is installed. protected. The sieve 11 is constructed as a frame of a scanning device equipped with a laser light source and a scanning means, and is arranged above the photoreceptor unit.

In this example, the synchronization detection device 1D is set at a position where the laser beam irradiates in the main scanning direction before scanning the plane mirror 29, but if it is on the scanning optical path and at a position in front of the start of writing, it is necessarily set in this position. It is not limited to location.

In this example, the writing position adjustment is performed by loosening the screws 12.16 from the outside of the housing 11 and moving the synchronization detection device 10 a required amount in the main scanning direction XX. It should be noted that if 1d scales are formed on the adjustment table 1, the amount of movement relative to the housing 11 can be easily determined. Furthermore, in this example, the cylindrical lens L1 that performs the imaging function for the photosensor 4 is assembled integrally with the photosensor 4 as a subunit, so the relative position between the cylindrical lens L1 and the photosensor 4 can be adjusted even when adjusting the writing start position. No need to adjust.

(effect).

The present invention is advantageous in that it is possible to easily and safely determine the starting position of writing on the photoreceptor by mechanical operation from the outside, rather than by electrical operation.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the synchronization detection device according to the present invention, Figure 2 is a perspective view illustrating a method of installing the synchronization detection device according to the present invention, and Figures 3 and 6 are perspective views illustrating an example of the scanning means. figure,
The Buddha statue is a plan view of the housing, and Figure 5 is a diagram showing the +ffI plane of the laser beam on the hologram diffraction grating. 1a, 1b...-long hole, 10, synchronization detection device, 11...
・Casing, 12, 13...screws.

Claims (1)

[Claims] Laser light modulated by image information is scanned onto a photoconductive photoreceptor to obtain an electrostatic latent image, and the latent image ? In a laser recording device that obtains a recorded image by developing and transferring, a synchronization detection device that generates a synchronization signal according to the scanning of laser light is installed from outside the casing in which the laser light source and scanning means are installed.
A synchronization detection device that can be adjusted to move in the scanning direction.