JPS5935118B2 - How to make an optical memory board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for creating an optical memory board in an optical memory device, in which a plurality of information sections are arranged on one flat optical memory board, and information from one information section is read out as needed. be.

Figure 1 is a conceptual diagram of this type of optical memory device, where 1 is a light beam deflector for extracting necessary information, and depending on the case, it may be replaced with a light emitting element corresponding to each information section. .

Reference numeral 2 denotes an optical memory board, which is divided into information sections 21 on which information is recorded.

Then, a microlens 3 corresponding to each information section 21 is provided.
1 is provided.

Reference numeral 4 denotes a condensing and imaging lens for improving the quality of reproduced images and freely changing the magnification, which is not essential to this optical memory device and may be omitted.

5 is an image sensor, which includes an image pickup tube, a photodiode array,
A phototransistor array or the like is usually used to convert the obtained optical image into an electrical signal and use it for printing or display, but of course it is also possible to use the optical image directly.

In the optical memory device described above, since the reproduced image of each information section 21 stored in the optical memory board 2 is normally enlarged and used when generating it on the image sensor 5, the corresponding position of the optical memory board 2 and the microlens group 3 is used. If the relationship differs for each information section 21, the position of the reproduced image formed at the position of the image sensor 5 will change, making it extremely difficult to design the imaging system of the image sensor 5.

For this reason, alignment between the optical memory board 2 and the microlens group 3 is important, but this alignment is extremely difficult in an actual optical memory device. In other words, since it is a deviation in the relative position between each information section 21 of the optical memory board 2 and the microlens 31 of the microlens group 3, the manufacturing error of each information section 21 and the manufacturing error of the microlens 31 have a synergistic effect. Therefore, the accuracy of each information section 21 and the microlens 31 is required in microns, and it is difficult to actually manufacture and design them with micron precision. The present invention has been made in view of the above circumstances, and its purpose is to ensure that the positions of the optical memory board and the microlens group are always the same regardless of the alignment error between the optical memory board and the microlens group during manufacturing. An object of the present invention is to provide a method for making an optical memory board.

Embodiments of the present invention will be described below with reference to FIGS. 2, 3, and 4.

As shown in FIG. 2, parallel rays 6 (preferably parallel rays parallel to the optical axis of the optical memory device) irradiated onto the microlens group 3 are condensed by each microlens 31, and the focal plane A (
To be precise, it constitutes a focal surface).

At this time, if there is a manufacturing variation error in the arrangement position of the microlenses 31 or a manufacturing inclination error of each microlens 31, the focal point 7 will not show a regular grid-like arrangement as shown in FIG.

Therefore, a position measuring device 9, which has a light receiving element 8 having a microscopic aperture as shown in FIG. The position of the focal point of the light beam 6 is detected and stored in the storage device 1.
Store as 0.

Based on the array dimensions of the microlenses 3 thus obtained, the position of each information section 2 on the optical memory board 2 is determined, and necessary information is recorded.

There are various known methods for recording this news, but for example, if you create an original version several times larger than the actual size, then reduce the original version to the actual size by taking photographs, etc. Alternatively, manufacturing errors of the optical memory board can be significantly reduced, and the optical memory board 2 having each piece of information can be manufactured at a location substantially corresponding to the arrangement position of each microlens 31 of the microlens group 3.

If the optical memory board 2 produced in this manner is used in an optical memory device as shown in FIG. 1, a high-quality image without any movement in the image forming position of the reproduced image can be obtained on the image sensor 5.

Note that if the position measuring device 9 of the microlens group 3 and the layer information writing method are linked, the optical memory board 2 can be produced relatively quickly and at low cost.

Since the present invention is constructed as described above, it is possible to create an optical memory board 2 having each piece of information at a location corresponding to the arrangement position of each microlens 31 of the microlens group 3. Therefore, the positions of the optical memory board 2 and the microlens group 3 can always be the same regardless of the manufacturing alignment error between the optical memory board 2 and the microlens group 3, and the formation of a reconstructed image is facilitated. A high-quality image without positional movement can be obtained on the image sensor 5.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an optical memory device, and FIGS. 2, 3, and 4 are explanatory diagrams of an embodiment of the method according to the present invention. 2 is an optical memory board, 21 is an information area, 3 is a microlens group, 3
1 is a microlens, 6 is a parallel ray, and 7 is a focal point.

Claims (1)

[Claims] 1 Parallel light beam 6 is sent to the optical memory board 2 within the optical memory device.
The light is irradiated onto the microlens group 3 to be provided behind the microlens group 3, and the focal point 7 of each microlens 3_1 of the microlens group 3 is scanned by the light receiving element 8 to record the coordinates of each focal point 7, and the coordinates are made to correspond to the coordinates. A method for creating an optical memory board, characterized in that the optical memory board is created by writing information into each information section 2_1 of the optical memory board 2.