JPH0366037A - Light scanning record device - Google Patents

Abstract

PURPOSE:To facilitate adjustment and yet to make a device inexpensive by performing the driving of a converging lens by a driving means with the movement of the position of the converging lens according to the deflection angle of a reflection converging mirror and electrically performing the converging motion of an optical beam. CONSTITUTION:The optical beam 3 emitted from a semiconductor laser 1 is made incident on a converging lens 11 after being made in a parallel beam by a collimator lens 2. The optical beam 3 passed through the lens 11 is polar ized with its reflection by a galvanomirror and with its reflection by a long-sized mirror 6 further it performs a main scanning in an arrow mark X direction on a sensitive film 7. At the same time the sensitive film 7 is transferred in an arrow mark Y direction almost orthogonal with the main scanning direction X by the endless belt 8 driven by a driving device 9 and subjected to sub- scanning. the optical beam 3 is two-dimensionally radiated on the film 7, there fore, subjected to ON-OFF controlling based on a digital image signal S like corresponding to a recording image and a recording image is formed. Thus the adjustment is easy and the device volume is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical scanning recording device that records an image by scanning a light beam deflected onto a photosensitive material using a rotatable mirror.

[Conventional technology]

FIG. 5 is a diagram showing a conventional optical scanning recording device disclosed in, for example, Japanese Patent Application Laid-Open No. 63-167559. A collimator lens 3 is a light beam emitted from the semiconductor laser 1, and 4 is a light beam 3.
A rotating polygon mirror 5 is a rotating polygon mirror 5 having a characteristic that the focal point position is proportional to the deflected angle.
A focusing lens consisting of a θ lens; 6 a long mirror for reflecting the light from the focusing lens 5 consisting of an f/θ lens at a predetermined angle; 7 a photosensitive film; 8 an endless belt for transporting the photosensitive film 7; 9 is a drive device for driving the endless belt 8, and 10 is a control device for controlling ON/OFF of the semiconductor laser 1.

Next, the operation will be explained.

A light beam 3 emitted from a semiconductor laser 1 is made into a parallel beam by a collimator lens 2, and then passed through a rotating polygon mirror 4.
incident on . The light beam 3 is reflected and deflected by the rotating polygon vi 14, passes through a focusing lens 5 consisting of an f/θ lens, is reflected by a long mirror 6, and is directed onto a photosensitive film 7.
At the same time, the photosensitive film 7 is conveyed in the direction of the arrow Y, which is substantially perpendicular to the main scanning direction Therefore, the light beam 3 is two-dimensionally irradiated onto the photosensitive film 7. The semiconductor laser 1 is then ON-OFF controlled by the control device 10 based on the digimo signal image signal S, thereby modulating the number of pulses of the light beam 3. Therefore, the photosensitive film 7
An image based on the image signal S is recorded.

[Problem to be solved by the invention]

Since conventional optical scanning recording devices are configured as described above, expensive optical components such as f/theta lenses must be used, and strict optical adjustments such as adjustment of the f/theta lenses are required. In addition, f/theta lenses are usually used in combination with multiple lenses, so they have a large volume and weight.
There have been problems in that the accuracy of the recorded image is largely determined by the accuracy of the optical components.

This invention was made to solve the above-mentioned problems, and it is possible to reduce the volume and weight of the optical device, and also eliminates the need to use expensive optical components such as f/θ lenses. A further object of the present invention is to obtain an optical scanning recording device that can be electrically adjusted from the outside.

[Means to solve the problem]

The optical scanning recording device according to the present invention condenses light with the condenser lens by moving the condenser lens using a driving means such as an electromagnetically operated actuator.

[Effect]

In the optical scanning recording device according to the present invention, the light focusing position can be optimized by providing information on the focusing position in synchronization with the deflection angle of the reflective deflection mirror and changing the position of the focusing lens.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, l is a semiconductor laser, 2 is a collimator lens for collimating the light emitted from the semiconductor laser l, 11 is a condenser lens for condensing the parallel light from the collimator lens 2, and 3 is a semiconductor A light beam emitted from the laser 1, 12 a galvano mirror for reflecting and deflecting the light beam 3, 7 a photosensitive film, 6 a long mirror for reflecting the light onto the photosensitive film 7, 8 conveying the photosensitive film 7 9 is a drive device for driving the endless belt 8; 10 is a 0N-
17 is an actuator that moves the position of the condensing lens 11; 19 is a galvano mirror;
12 is a galvanomirror drive device that drives the actuator 17; 20 is an actuator drive device that drives the actuator 17;

The operation of the above embodiment will be explained below.

A light beam 3 emitted from a semiconductor laser 1 is made into a parallel beam by a collimator lens 2 and then passed through a condenser lens 1.
1. The light beam 3 that has passed through the condensing lens 11 is incident on the galvanometer mirror 12, is reflected and deflected, and is further reflected on the elongated mirror 6, thereby scanning the photosensitive film 7 in the direction of the arrow X (main scanning). At the same time, the photosensitive film 7 is conveyed by the endless belt 8 driven by the drive device 9 in the direction of the arrow Y, which is substantially perpendicular to the main scanning direction X, and sub-scanning is performed. is irradiated two-dimensionally. Then, the semiconductor laser 1 is controlled by the control device 10.
ON-OFF control is performed based on the digital image signal S corresponding to the recorded image, and the recorded image is formed.

Next, FIGS. 2 and 3 show the above-mentioned light condensing operation in detail.

Based on FIG. 4, a method of focusing the light beam 3 will be explained in detail.

In FIG. 2, 11 is a condensing lens, 14 is a lens holder that holds the condensing lens 11 and moves to any position within the movable range of δl, and 18 is attached to the lens holder 14 to hold the condensing lens 11. A supporting member 15 is a magnet, 16 is a coil, and these support the actuator 1.
7.

In FIG. 4, 19 is a galvano mirror drive circuit for driving the galvano mirror 12, and 20 is an actuator drive circuit for driving the actuator 17.

In Fig. 3, a light beam 3 is
When the light beam 3 is reflected and deflected, the focal point position of the light beam 3 is distributed on an arc FC having a radius l and centered on the point where the light beam 3 enters the galvanometer mirror 12. In this case, the light beam 3 is focused at the point O on the photosensitive film 7 (hereinafter referred to as focusing), but it is not focused at the point P. Therefore, the light beam 3 is focused at the point P, Move the condensing lens 11 in the direction toward the photosensitive film 7 by the difference δl between the point P on the photosensitive film 7 and the point P' on the arc FC where the focusing positions are distributed. For example, l=400mm, h/2=
108mm, θ=15.1', δ1'=1
．． It will be 16mm. Therefore, at this time, it is sufficient to bring the condenser lens 11 close to the photosensitive film 7 by about 7.16 mm. As in this example, the movement amount δl is δl1=1・(1/cosθ−
1) and given as the amount of movement of the condenser lens 11.

Therefore, the light beam 3 can be focused on the photosensitive film 7 by synchronizing the movement amount δl with the deflection angle θ of the galvanometer mirror 12 and converting it into electric power to be applied to the actuator 17 in response to the ever-changing θ. It becomes possible. FIG. 4 shows an example of a galvanometer mirror in which an actuator drive circuit 20 is provided to drive the actuator 17.
The position of the condensing lens 11 corresponding to the deflection angle θ of 12 (hereinafter referred to as an appropriate position) is given by the actuator drive circuit 20.

At this time, the galvanomirror drive circuit 19 is shown in FIG.
), a galvano mirror drive signal is output as shown in FIG. 4(b), and the galvano mirror 12 is driven. On the other hand, due to the input of the synchronizing pulse from the actuator drive circuit 20, as shown in FIG.
), the actuator drive signal is output, and the actuator 17 is driven. This actuator drive signal is Y(T-) = Yo (1/cos θ(
t)-1). In this method, the traveling speed of the light beam 3 in the main scanning direction X is proportional to the deflection angular speed by the galvanometer mirror 12.

In the above embodiment, the movement amount δl was given by the actuator drive circuit 20 having predetermined characteristics, but the optimum position of the condensing lens is stored in advance by a condensing lens position memory, and the optimum position data is transferred to the D/D. After being A-converted and amplified, it is also possible to read out the signal in synchronization with the deflection angle of the reflective polarizing mirror and provide it to the actuator 17 as driving power.

Further, in the above embodiment, an example was shown in which the galvanometer 12 was used as a means for deflecting the light beam 3, but a rotating polygon mirror may also be used. In this case, the incident position of the light beam 3 is rotated by the mirror. Although the focal length changes due to the movement of the lens, it is possible to always keep the focusing position appropriate by configuring the actuator drive circuit 20 in consideration of the correction value or by correcting the data in the focusing lens position memory. can.

〔Effect of the invention〕

As described above, according to the present invention, the condensing lens is driven by the driving means by moving the position of the condensing lens according to the deflection angle of the reflective deflection mirror, thereby performing the condensing operation of the light beam. Since it is constructed to be electrically operated, the device can be made inexpensive, adjustment is easy, and the device volume can be reduced. Further, there is an effect that the accuracy of recorded image quality can be electrically determined by adjusting this light focusing operation.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an optical scanning recording device according to an embodiment of the present invention, FIG. 2 is a diagram showing an actuator for driving a condensing lens in the above embodiment, and FIG. 3 is a diagram showing an actuator for driving a condensing lens in the above embodiment. FIG. 4 is a diagram illustrating the movement amount, FIG. 4 is a diagram showing a condensing lens movement signal generating section, and FIG. 5 is a diagram illustrating a conventional optical scanning recording device. 1 is a semiconductor laser, 2 is a collimator lens, 3 is a light beam, 6 is a long ξ mirror, 7 is a photosensitive film, 8 is an endless belt, 9 is a driving device, 11 is a condenser lens, 12 is a galvano mirror, and 19 is a galvano mirror. - drive circuit; 20 is an actuator drive circuit; Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A semiconductor laser, a collimator lens that converts the light beam emitted from the semiconductor laser into parallel light, a condenser lens that condenses the light beam emitted from the semiconductor laser, and a position of the condenser lens. a driving means for moving the light beam, and a means for deflecting the light beam by a reflective deflection mirror for optical scanning recording, the driving means for driving the condenser lens according to the deflection angle of the reflective deflection mirror. An optical scanning recording device characterized in that scanning is performed by moving the position of.