JPS60172014A - Laser optical scanner - Google Patents

Abstract

PURPOSE:To eliminate such faults as detachment of a packing due to tension of a lead wire, loosening, hanging down, etc. of the lead wire, and also to make a complicated packing installing process unnecessary at the time of assembling, by installing a lead wire drawing-out part of an electric apparatus used for a optical scannner, to the outside of an enclosed cover of the light scanner. CONSTITUTION:Various members extending from a laser light source unit 1 to a cylindrical lens 12 on an optical path, for changing laser light emitted from a laser light source unit 1 for constituting a scanning means, to a scanned light and leading it to a photosensitive body are incorporated in a cover 14. This cover 14 is formed like a box whose upper part is opened, and a seat surface 14a of the upper end is covered with a cover 15 and clamped with a screw 16, and closed up tightly,leaving a scanning light emitting window. Each electric apparatus is installed by positioning its lead wire drawing-out part at the outside of the cover 14. First of all, as for the laser light source unit 1, a flange 1a is made to adhere tightly to the seat surface of the outside of the cover 14, and in a state that is screwed to the seat surface from the outside of a radiation fin 1b, a cylinder part 1c to which a collimating lens for converting a diverging light from a semiconductor laser to parallel rays is engaged to a hole 14c1, and regulated so that the laser light can be emitted in the prescribed direction in the cover 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a laser beam scanning device, and more particularly to a laser beam scanning device that can be applied to a laser writing device, a laser reading device, etc.

(Prior art) In optical scanning devices that convert laser light from a laser light source into scanning light using a scanning means, laser safety standards are used to prevent the laser light from leaking outside and harming the human body. (BRH), a sealed structure is used to prevent laser light from leaking from parts other than the scanning light exit window.

In that case, the problem is how to guide the lead wires of various electrical components used in the optical scanning device to the outside of the cover that maintains the above-mentioned airtight state while ensuring airtightness.

Conventionally, a hole was made in the cover, a lead wire was inserted into the hole, and the gap between the lead wire and the hole was closed with a piece of urethane or rubber. Therefore, if the lead wire is pulled, the wire may come off, resulting in a lack of reliability. Further, since the lead wires are present inside the cover, there may be a problem such as the bent lead wires hanging down on the optical path of the scanning light. Furthermore, there is also the problem that a complicated panoki/installation process is required during assembly.

(Objective) Accordingly, it is an object of the present invention to provide an improved laser beam scanning device that can overcome the drawbacks and problems of the prior art described above.

(composition) Structure of the present invention? , will be explained below based on one embodiment.

The configuration of a laser beam scanning means using a semiconductor laser as a laser light source is shown in Figure 1.

First, an overview of scanning by this quantitative means will be explained together with the members constituting the fixed meal means.

In the figure, a laser beam Lb from a laser light source unit 1 passes through an aperture lens 2 and an aperture 6 for beam shaping, is reflected by a plane mirror 4.5, and is transmitted to a hologram grating disk at a predetermined angle of incidence. 6
and enters one of the hologram diffraction gratings on the hologram grating disk 6.

The hologram grating disk 6 has a disk shape as shown in FIG. 2, and has a plurality of optically equivalent hologram diffraction gratings 1-1, 1-2, 1-2, 1-2, 2, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, hologram gratings on one surface of a transparent circular substrate.・・・・・・
. . , 1-i, . . . are arranged in an annular shape.

The hologram diffraction grating 1-1 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 6 is fixedly VC mounted to the shaft of the motor 7 by a mounting device not shown.

It is designed to be rotated by a motor 7.

In Fig. 2, the direction of the grating lines of the diffraction grating in the hologram diffraction grating 1-1 is A-A@, that is, the straight line connecting the center of the hologram diffraction grating 1-1 and the rotation center of the hologram grating disk 1. is parallel to the direction of

When the laser beam Lo enters the hologram diffraction grating 1-i, diffracted light is generated by the hologram diffraction grating 1-iK. Note that the symbol Lbi in the figure indicates a beam cross section of the incident laser beam. When the hologram grating disk 6 rotates, the direction of the grating lines of the hologram diffraction grating 1-1 relative to the incident laser beam Lb Vc rotates, so that the direction of the diffracted light has its apex at the incident position of the laser beam LD. Changes along the conical surface. Each hologram diffraction grating 1-1 formed on the hologram grating disk B
are optically equivalent to each other, the hologram grating disk 1 rotates, and the deflection of the diffracted light is repeated each time the hologram diffraction grating on which the laser beam Lb is incident is switched.

Now, the diffracted light generated from the hologram diffraction grating 6vc is
As shown in Figure 1, after being reflected by a plane mirror 8 placed above the hologram diffraction grating, the light is transmitted to the scanned surface via an fO lens 9, plane mirrors 10 and 11, and an optical lens 12. It is focused on the body 16 in the form of a spot. Then, as the hologram grating disk 6 rotates, the spot-like convergence point is linearly displaced on the scanned surface, and the spot-shaped focusing point is linearly displaced on the scanned surface. Main scan.

In Figure 1, reference numeral 16 denotes a synchronization detection device, which receives the scanning light and generates a synchronization signal for starting writing on the photoreceptor before the scanning light reaches the plane mirror 10.

In the above, the members that convert the laser light emitted from the laser light source unit 1 into scanned light and are 1 l/2 m apart from the photoreceptor constitute a scanning means,
It is incorporated into the cover 14 as shown in Figures 2 and 3. However, in order to avoid complexity, there is a lindrical lens 2 on the optical path.
The members from to the plane mirror 8 are not shown.

In Figure 6, a slit-shaped constant strain light exit window is formed directly below the plane mirror 11, and a glue/drical lens/zipper 1 is formed at the core.
2 is attached and protected by dust-proof glass, but illustrations of these are omitted because they are not directly related to the present invention.

As shown in the figure, the cover 14 has a box shape that is open from the top, and a lid 15 is placed on the seat surface 14a at the upper end, and a screw 16 is inserted into the cover 14.
By knitting it together, the scanning light exit window is left in place and sealed.

In a laser beam scanning device such as J, an electric motor, etc.

Hereinafter, an example will be described in which these electrical components are mounted with their lead wire extraction portions located outside the cover 14.

First, the laser light source unit 1 is orientated. Symbols 1a+ and ia2 are the screw holes, and symbols 14b1 and 14o2 are the cover 14. With the flange 1a formed by the VC being screwed to the seat surface of the cover 14, the divergence yc from the semiconductor laser is subjected to parallel lamination K conversion. The cylindrical portion 1c fitted with a collimating lens is arranged to engage the hole 14C1 and emit laser light in a predetermined direction within the cover 14.

Here, the lead wire attachment portion 1d is located between the flange 1a and the radiation fin 100, and is naturally located outside the cover 14.

Note that the lead wire 1f is used for supplying power to drive the semiconductor laser and controlling the temperature of the semiconductor laser.

Next, regarding the motor 7, as shown in Figure 73 of the blade and Figure 5 of the spear, 11 of the covers 14. This is done by tightly fitting the flange 7a to the seat surface 14g formed in the shape of 1 and tightening it with screws 17 and 18. At this time, the motor 7 is
It protrudes to the outside of the cover through a hole 14c2 formed in the cover 14, and thereby the lead wire attachment portion 7d also protrudes to the outside of the cover. Further, the hologram grating disk 6 is covered with a cover 14.
It will be located inside.

The saw 1@7f is for supplying power to the motor and for controlling the rotational speed.

In addition, as a modification of the attachment of the motor 7, there is also a method of screwing it from the outside of the cover 14, as shown in Figure 6.

Next is the synchronization detection device 16, which also has the following details:
As shown in Figure 33 and Figure 7, the laser light source unit 1
From the outside of the cover 14, attach the holder 1 according to the installation method of
A long hole 16 formed in 6d and long in the scanning direction of the laser beam
a, screwed through 16b.

The reason why the holes are long is to ensure an adjustment margin for adjusting the writing start position on the photoreceptor 16. This synchronization detection device 16Vc is equipped with a photo sensor and a solindrical lens for forming an image of laser light on the photo sensor. This 7-point/trical lens has a square-shaped protrusion 16c.
It is attached to the tip of the This protruding portion 16c1 passes through a square hole 14h formed in the cover 14VC and protrudes to the inside of the cover 14.

The photocell is installed in a cylinder 16g which is held between the holder 16d and a substrate 16e which is assembled opposite to the holder 16d, and circuits for generating a synchronizing signal and the like are constructed on the substrate 160.

Therefore, the terminal 16f as a lead wire attachment portion on the board 16e is also naturally located outside the cover 14. The lead wire i6h connected to the terminal 16f is for driving the photosensor and for the synchronizing signal generating circuit.

Next, the dew condensation prevention heater is attached to the outside of the cover 14, as shown by reference numeral 19 in Figures 6 and 8. This dew condensation prevention heater 19 is provided as a means for heating various optical systems installed inside the cover 14 so that dew condensation does not occur due to changes in the environmental temperature. Inside of 11i1 K
It is attached by tightly contacting the illuminating surface 20a of the protruding recesses 2[, 1] and tightening screws 21.22VC.

The recessed portion 20 is indicated by the reference numeral 20', which is a protrusion that appears when viewed from inside the cover 14 'IA9'.

The lead wire attachment portion 19d is located on the outside of the cover 14 together with the dew condensation prevention heater 19. The lead wire 19f is for power supply to the heater.

(Effects) According to the present invention, since the lead wire attachment portion of the electrical component is located outside the cover, there is no need to provide a sealing means when guiding the lead wire from the inside to the outside of the cover, which is convenient.

[Brief explanation of drawings]

Figure 1 shows an example of a laser beam scanning means. l
- Figure 2 is a partially enlarged blade of the hologram grating disk; Figure 6 is a perspective view of the cover and lid on which the running means is attached; Figure 4 is an exploded perspective view explaining the installation state of the laser light source unit;
Figures 5 and 2 and 6 are perspective views that explain the installation state of the motor, Figures 2 and 7 are exploded perspective views that explain the installation state of the synchronization detection device, and Figures 2 and 8 are perspective views that explain the installation state of the wiring prevention heater. It is an exploded perspective view explained. 1. Ray v-gen m unit, 7. Motor, 14.
・Cover, 16... Synchronization detection device, 19... Condensation prevention heater, 11f... Terminal, Id, 7a, 19d...
Lead wire attachment part. Heart γ ■ /f

Claims (1)

[Claims] In an optical scanning device that converts laser light from a laser light source into scanning light by a scanning means, the lead wire extraction portion of various electrical components used in this optical scanning device is located outside the airtight cover of the optical scanning device. Did you wear it like that? Patented laser beam scanning device.