JPS5820022B2 - The world of science and technology - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for combining and recording two pieces of information such as variable information and fixed information, and particularly relates to a method for recording variable information and fixed information in a device that records variable information on a micro film by two-dimensional scanning of a laser beam. This invention relates to a synthetic recording method of fixed information.

There is a trend toward using a collimated light beam like an i-za light beam in a device that records output information from a computer on microfilm, and this device is called a laser comb device.

This is because if a highly collimated light beam such as a laser beam is focused, it is possible to create an extremely small light spot, and therefore to obtain a light spot with extremely high optical energy density, which increases the recording density. This is based on the advantage that recording media with high sensitivity and low sensitivity can be used.

In a comb device using such a laser beam, it is necessary to synthesize and record not only variable information according to the output from the computer, but also fixed information such as a form.

These variable information and fixed information are both transmitted to the laser beam.
If you try to record by dimensional scanning, (1) you need a read-only memory medium to store the fixed information, and (2) even if the variable information exists only in a part of the screen, the fixed information is Since there is a strong demand for recording over the entire screen, the problem arises that the laser beam must always scan the entire screen, making it impossible to increase the recording speed of the entire device.

Therefore, variable information is recorded by two-dimensionally scanning a laser beam on the recording medium, and fixed information is displayed two-dimensionally on an information board (slide, liquid crystal display element, etc.) and then condensed onto the recording medium. Imaging and recording methods are advantageous.

In this case, two light beams carrying variable information and fixed information are made coaxial and guided onto a recording medium for combined recording. Conventionally, a method using a half mirror has been known.

However, when using a half mirror, even assuming that there is no absorption loss in the half mirror, if the reflectance and transmittance are both 50%, each of the light beams carrying variable information and fixed information will have 50% You will suffer a loss of %.

This is not preferable for the purpose of utilizing high energy density as described above.

Furthermore, it is often difficult to arrange a half mirror in a limited space.

It is an object of the present invention to provide a galvanometer mirror with dichroic optical characteristics, to have the mirror reflect a laser beam carrying fluctuating information at a high rate to vertically deflect it, and to produce white light carrying fixed information. The purpose of this invention is to solve the problems of the conventional method using a half mirror by transmitting light in a wide wavelength range at a high rate.

The present invention will be described in detail below with reference to the drawings.

Figures 1 and 2 are schematic diagrams of an optical system that records variable information with a collimated light beam such as a laser beam, with Figure 1 showing a top view and Figure 2 a side view. There is.

A light beam 1 emitted from a laser light source 100 is intensity-modulated by an optical modulator 101 according to a signal corresponding to fluctuation information.

The light beam 2 carrying this variation information is transferred to a horizontal deflector 102.
The light beam is horizontally deflected from position 31 to position 32 by a rotating polygon mirror, and further focused by a first lens 103 at a focal plane of 4 degrees.

A focused light spot is generated at a position 41 to 4□ on a focal plane of 4° depending on the light beam position 31 to 32.

The straight line connecting the light spot positions 4 and 42 is the first horizontal scanning line 4.
becomes.

Further, the light beams 51 to 5□ that have passed through the first horizontal scanning line 4 are vertically deflected (deflected in a direction perpendicular to the horizontal deflection) by a vertical deflector 104 (mirror of a galvanometer), and are also deflected by a second lens 105. The microfilm 106 is used to form a reduced image of the first horizontal scanning line 4.
A scanning line 72 to 7□ is formed above by the movement of the light spot.

In this way, variation information is recorded on the microfilm 106.

When using a fluctuating information recording optical system such as the one described above, conventionally half-
These have been synthesized using mirrors.

FIG. 3 shows a side view of an example of a conventionally considered synthetic recording optical system using a half mirror.

Vertical deflector (galvanometer mirror) in Figure 3
Half mirror 10 between 104 and second lens 105
7 is inserted to make the fixed information carrying light beam 8 from the fixed information display board 108 coaxial with the laser beam 6 carrying variable information.

In such a composite recording optical system using a half mirror, there is a large loss in the amount of light as described above.

Furthermore, there is generally a demand for the distance between the vertical deflector 104 and the second lens 105 to be as small as possible in order to avoid the need to increase the aperture of the second lens 105. It is not recommended to insert it.

Further, the position 1071 or 107'I is also considered as the insertion position of the half mirror.

However, when a half mirror is inserted at the position 107', the following problems occur.

The fixed information carrying beam 8 is also vertically deflected by a vertical deflector 104 together with the laser light beam carrying variable information.

This means that fixed information moves on the microfilm 106.

It is disadvantageous that the fixed information provided by imaging as surface information moves onto the microfilm 106.

Therefore, even if the vertical deflector 104 rotates, only the fixed information must remain stationary on the microfilm 106.

In order to avoid the above-mentioned inconvenience, there is a method of separating the recording time of fixed information from the recording time of variable information, that is, a method of recording fixed information and variable information at different times. It is not preferable to arrange a half mirror in this space because it requires a sophisticated control system to return to a predetermined angle and stop.

- If a half mirror is inserted at the 107" position, another lens 10 is used to image the fixed information board 108".
5" is required, which is not preferable because it requires a large space.

All of the above methods have problems that are difficult to solve easily, and it is an object of the present invention to solve these problems.

FIG. 4 shows an optical system according to one embodiment of the method of the invention.

The method of recording fluctuation information using a laser beam is similar to the method described above.

The vertical deflector 104 reflects only the wavelength of the laser beam for recording fluctuation information and the wavelengths in the vicinity thereof with a high reflectance,
For light of other wavelengths, use one with dichroic optical properties that allows it to pass through with high transmittance.

Therefore, the laser light carrying variable information is effectively reflected and imaged on the microfilm.

- The fixed blade information board 110 is illuminated through a condenser lens system 112 with light emitted from a white light source 111 with a short emission time, such as a strobe lamp used for photography.

The fixed information plate 110 is placed at a position equivalent to the first horizontal scanning line 4 with respect to the second lens 105.

That is, the second lens 105 reduces the first horizontal scanning line 4 and the fixed information plate 110 and forms a composite image on the microfilm 106.

The vertical scanner (galvanometer mirror) 1041 has dichroic characteristics as described above, and the white light source 111
Of the white light emitted by the white light beam 10, light other than the wavelength of the laser light for recording variable information and wavelengths in the vicinity thereof is made to be transmitted with high transmittance. The light energy is efficiently irradiated onto the microfilm 106.

That is, since only light having the wavelength of the l/-the light and wavelengths in the vicinity thereof are reflected, only the amount of light is attenuated.

As described above, the method of the present invention has the following advantages.

(1) Among the laser light beam carrying variable information and the white light beam carrying fixed information, light having a wide range of wavelengths other than the wavelength of the laser light beam and wavelengths in the vicinity thereof can be used with high efficiency.

(2) Since a fixed information recording optical system can be easily added to a variable information recording optical system based on two-dimensional scanning of a laser beam, the entire optical system can be arranged spatially small.

(3) Since the distance between the vertical deflector and the second lens can be shortened, it is not necessary to use a very large diameter second lens.

(4) The second lens can be used commonly for recording variable information and fixed information.

In addition, in the method of the present invention, since the vertical deflector operates when the fluctuation information and rotational information are simultaneously recorded, there is a possibility that the image of the fixed information on the microfilm may be blurred.

However, this problem can be solved by reducing the thickness of the vertical deflector (mirror of a galvanometer) and by making the exposure time for recording fixed information sufficiently smaller than one scanning time of the vertical deflector.

In fact, the mirror thickness of the vertical deflector is about 1 mvt, the scanning time of the vertical deflector is more than 100 m5ec, the total deflection angle of the galvanometer mirror is about 4°, and the magnification of fixed information is about 0.5 times by the second lens. In this case, if a xenon flash lamp with a light emission time of several hundred microseconds is used as a light source for illuminating the fixed information board, the blur on the microfilm will be less than 0.2 microseconds, so this problem can be ignored.

As described above in detail, according to the present invention, variable information and fixed information can be easily combined and recorded without requiring sophisticated control or large space.

Furthermore, according to the present invention, not only can laser light energy carrying fluctuating information be used with high efficiency, but also light energy of a wavelength other than the wavelength of the laser light carrying fluctuating information among the white light carrying fixed information can be used with high efficiency. Because of its availability, it is also possible to increase the scanning speed, and it is possible to use recording materials with lower sensitivity.

In addition, input using the expressions variable information and fixed information will be explained.

Variable information generally has variable content; for example, in the embodiment, it is output information from a computer, and the information is converted into modulation of a laser beam and modulated by the modulated laser beam. This is information recorded by exposing a recording material to light by two-dimensionally scanning it.

However, in the present invention, as long as the information is two-dimensionally scanned, it does not need to be so-called fluctuation information, and is not limited to this embodiment.

That is, even if there is no output signal from the computer, it is sufficient that the laser beam carries scanning type information (such as information carrying a modulated signal in time series).

For example, a certain image may be scanned with laser light and the transmitted light or reflected light may be used.

Further, as long as it is strong energy light, it is not limited to laser light.

Fixed information is generally information whose content is not variable, such as various forms, and is recorded by full exposure on the surface of the recording material, and does not require two-dimensional scanning. It is something.

However, the exposure is not limited to one time, and may be divided or overlapped.

Furthermore, the light beam carrying fixed information is not limited to white light, but can also be light with spectral characteristics such that when passing through a mirror with dichroic characteristics, the attenuation rate of the light passing through the mirror is small. Bye.

That is, the light is not limited to white light that generally has a continuous spectrum in the visible range, but may be light that is a complementary color to the scanned light that effectively utilizes the dichroic characteristics.

It goes without saying that the recording material does not need to be a microfilm as long as it is used in the present invention.

[Brief explanation of the drawing]

1 and 2 are a schematic plan view and a side view of an optical system of an information recording device using a light beam, and FIG. 3 is a side view of a conventional recording device for recording fluctuating information and fixed information in combination. FIG. 4 is a side view of an embodiment of a recording apparatus implementing the present invention. 100... Laser light source, 101... Modulator. 102...Horizontal deflector, 103,105・Song・
Lens, 104...Vertical deflector, 106...
... Recording materials, 108.110 ... Fixed information board.

Claims (1)

[Claims] In a method for recording 12 pieces of information on a recording material,
The light beam carrying one of the two pieces of information is reflected and deflected by a galvanometer mirror having dichroic optical characteristics, and most of the light beam carrying the other information is transmitted; 1. A synthetic recording method for information, characterized in that two light beams carrying two pieces of information are coaxially guided to the recording material.