JPH04172762A - Optical original reader - Google Patents

Abstract

PURPOSE:To eliminate the need for assembly and adjustment by mounting a light emitting element to an upper face of a micro lens section while the face is directed downward and mounting a light receiving element in parallel with the light emitting element while the face is directed downward. CONSTITUTION:A light shield mask 3 is formed to a part where a micro lens 4 is desired to be formed by using a transparent plate 2 made opaque and contracted when a light is sensed, a collimated ultraviolet ray 1 radiates from an upper face to form an opaque part and the micro lens part 4. In this case, the apex part formed to a spherical part of the micro lens part 4 is formed to an optional position in a range of the micro lens part 4 by varying the density or the area of the light shield mask 3 continuously. Thus, the light receiving element and the light emitting element are mounted on the same substrate on which the micro lens is provided to make the size compact and the optical information is led to the light receiving element without crosstalk.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical document reading device that is capable of optically reading a document.

BACKGROUND OF THE INVENTION A conventional optical document reading device has a light receiving element 32 attached to a circular insert board 30 as shown in FIG.
In addition, a rod lens 34 is attached to the tip of the holder 37, and a light source section 35 consisting of a light emitting diode and a lens (located close to the front original 36) is attached to the tip of the holder 37. Problems to be Solved by the Invention In the above-mentioned conventional configuration, since the rod lens 34 is combined below the sealing glass 33 at a predetermined interval, it is necessary to adjust the rod lens 34 in the height direction. In order to solve the above-mentioned problem, the present invention provides a substrate with a microlens, in which a light emitting element is mounted on the upper surface of the microlens part. The light receiving element is mounted face down in parallel to the light emitting element.A Function With the above configuration, the board itself acts as a rod lens, eliminating the need for assembly and adjustment, and also allowing the light source to Since it can be mounted on the same substrate, it can be placed close to the document surface, and the height can be made small.

EXAMPLES Hereinafter, examples of the present invention will be explained with reference to the drawings. FIG. 1 shows a method for manufacturing a microlens in the first example of the present invention. 2(Y) is a transparent plate that is opaque and shrinks when irradiated with ultraviolet rays 1, and 3?L is a mask for forming the microlens 4.About the microlens configured as above, the following is as follows.
The manufacturing method will be explained.

First, using a transparent plate 2 that becomes opaque and shrinks when exposed to light, a light-shielding mask 3 is placed on the part where the microlens 4 is to be made, and parallel ultraviolet light is irradiated from above to form the opaque part and the microlens part 4, respectively. At that time, each light-shielding mask 3 continuously changes the density or the area, so that the apex of the spherical shape of the microlens part 4 can be adjusted arbitrarily within the range of the microlens part 4. As described above, according to this embodiment, in a transparent plate that becomes opaque and shrinks when exposed to light, the density can be continuously changed so that the amount of ultraviolet ray irradiation can be changed. By using a light-shielding mask with a different area or a light-shielding mask with a different area, it is possible to form a microlens that can focus at a position away from the central axis of the microlens. Embodiment 1 will be explained with reference to the drawings. FIG. 2 shows a light emitting device showing a second embodiment of the present invention. In FIG. A substrate including a microlens section 12, 13
is a light emitting element mounted face down on the upper surface of the microlens section 12. 14ζ, substrate 11 and light emitting element 1
The manufacturing method for the light emitting device configured as described above will be explained below. At this time, the microlens 12 is formed to be larger than the light emitting area of the light emitting element 13.The upper surface of the microlens 12 is then polished and a conductive material such as Au or Ag-P is applied to the surface of the opaque part. A circuit conductor layer is formed using a screen printing method or a thin film forming method and a photolithography method (not shown).Also, the light emitting element 13 is formed using a liquid phase epitaxial growth technique using a single crystal N-type substrate such as GaAs or GaP as an epitaxial growth substrate. A metal such as gold is deposited on both sides of the substrate 11 by vapor deposition or sputtering to form an electrode (not shown). A prescribed amount of curable insulating resin is applied using a stamping method, screen printing method, etc., and the light emitting surface of the light emitting element 13 is placed on top of it with the light emitting surface facing downward, and the electrode is placed at a predetermined position on the circuit conductor layer. According to this embodiment, as described above, the focal direction can be set arbitrarily. By mounting a light emitting element on a microlens that can be changed to a microlens and providing a circuit conductor layer on the same substrate, the direction of light convergence can be changed without tilting the light emitting device itself. Embodiment 3 will be described with reference to the drawings. FIG. 3 is an optical document reading device showing the third embodiment of the present invention. In FIG. 3, 21 is an image sensor element, and 22 is an image sensor element. A light receiving element 23 is a light emitting element formed within the image sensor element 21. 2
4 is a substrate on which a circuit conductor layer is formed, 25a, 2
5b is a microlens formed in the substrate 24; 26 is an opaque portion of the substrate other than the microlens; 27 is a document to be read; To explain the manufacturing method and operation, first, a semiconductor process is used to fabricate a light receiving element 22 on a single crystal silicon substrate.
Various elements such as a scanning circuit (not shown) and electrodes (not shown) are formed and then cut using high-precision dicing technology to produce the image sensor element 21. At this time, the light receiving element 22
The size is 75μm× with a pitch of 8dots/mm on 1.
The microlenses 25a were arranged in a line with a diameter of 225 μm. Furthermore, the microlenses 25a were fabricated using the manufacturing method described in the first embodiment, and a masking mask was formed using a light-shielding mask with uniform density and area.
The microlens 25b is formed in parallel with the microlens 25a overnight in a substrate provided with a circuit conductor layer. At this time, the opaque portion 26 is formed to prevent crosstalk between the light passing through each of the microlenses 25a and 25b. to the next
The light emitting element 23 is mounted on the upper surface of the microlens 25a by the method described in the second embodiment, and the image sensor element 21
(The light-receiving element 22 is mounted on the upper surface of the microlens 25'b in the same manner as the light-emitting element 23.) The operation of the optical document reading device manufactured in this way is as follows. ζyo Micro lens 25a
The light passes through the image sensor element 21 and is focused on the original 2.
Illuminate 7.

Light information from the original 27 passes through the microlens 25b and has a one-to-one correspondence with the light-receiving element 22, and since there is an opaque portion 26, the light information can be transmitted to the light-receiving element 22 without crosstalk.
As described above, according to this embodiment, by mounting the light-receiving element and the light-emitting element on the same substrate provided with a microlens, it is possible to make the light-receiving element compact and to transfer optical information to the light-receiving element without crosstalk. Effects of the Invention As described above, the present invention allows the focal direction of the microlens to be changed arbitrarily, and a light emitting device using this can arbitrarily change the focusing direction of light without tilting itself. It is possible to change the image and get it as close to the original as possible.
In addition, since the substrate also serves as a lens, there is no need to assemble and adjust the lens, making it easier to work with.A light source can also be attached to the same substrate. Not only can it be made more compact, but it also enables high-quality, high-order isolation and high-resolution reading because there is no crosstalk during reading.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a light emitting device in a second embodiment of the present invention, and FIG.
Figure (edition (b)) is a cross-sectional view of the optical document reading device according to the third embodiment of the present invention, and Fig. 4 is a structural diagram of the conventional example.
...Messuku 4, 12, 25... Microlen, t
lL24,30... Group K13... Light emitting element,
14... Metal thin wire 21. 31... Image sensor element, 22, 32... Light receiving element, 23... Light emitting element, 26... Opaque plate 33... Sealing glass 2.3
4... Rod lens 35... Light source test 36... Original species 37... Holder. Name of agent: Patent attorney Akira Okaji and 2 others / −
-1 Murasaki Tato 與艷 2-・iw 月 1 3-・Ikuri 4°-Kuikuroshi) and 1st figure 2 仝-Yogi 25- iiku vL>also 3rd figure 26-, Imdo Akibu? 1 2'6a

Claims (3)

[Claims] (1) A method for manufacturing microlenses, which comprises masking a transparent plate that becomes opaque and shrinks when irradiated with ultraviolet rays to form microlenses using a mask that changes the amount of irradiation of the ultraviolet rays. (2) A light emitting device comprising: a circuit conductor layer formed on a substrate provided with the microlens according to claim 1; and a visible light emitting element mounted face down on the upper surface of the microlens portion. (3) An optical document reading device in which a light-receiving element is mounted face-down in parallel with a light-emitting element on the same substrate as the light-emitting device according to claim 2.