JPS6015622A - Writing device of optical information - Google Patents

Abstract

PURPOSE:To obtain an inexpensive optical information writing device of less illuminance variance by making adjacent images of optical information of LED elements coincident with each other to write optical information. CONSTITUTION:In an LED array 1, chips 2 are arranged in a line on a substrate 1a, and an LED element group 3 having a length WLL is provided on each chip 2. An aperture plate 5 having holes 5a is provided above light shielding members 4, and a gathering optical system 6 is provided on this aperture plate 5. The system 6 consists of a lens array 7 where plural lenses 7a having optical axes in centers of groups 3 are joined into one body. Optical information emitted from each group 3 is projected as an inverted actual image having a length WLL' onto an information carrier 8 above the system 6 by each lens 7a and at this time, a main beam 9 emitted from the element 3a placed in the end part of the group 3 and a main beam 10 emitted from the element 3b in the end part on the opposite side of the group 3 adjacent to this element 3a coincide with each other on the carrier 8.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a writing device for writing optical information into equipment such as facsimiles and printers.

Conventional technology Conventional technology uses light 11' for information carriers such as facsimiles and printers.
For example, the device shown in FIG. 1 is known as a device for writing one report. In the above writing device, L/! is provided in two rows. ”
The light emitted from the D element arrays α and b is concentrated onto the information carrier e using collective optical systems c and d such as cell-hock lenses (product name), and optical information is written on the information carrier e. As shown in FIG. 2, LED array chips f and da are arranged in a staggered manner as shown in FIG. 2 for the LED element arrays α and b. This is LED array chip fz
This is because a problem occurs when y' are arranged in one line as shown in FIG. 3(a). That is, each LE
LED elements f', y' configuring D array chips f, y
It is necessary to equalize the distance DL between the LED elements f' and y' at the connection portion of each LED array chip f and da. Distance Db between each of the above LED elements f' and y'
are the width FL of the LED elements f', y' and the required resolution (1/DL+FL). Let's take a look at the resolution (''/,,) and set it to +01Am, FL
If it is 4Q tan, it becomes Ih -60μm.

Therefore, L at the connection part of each LED array chip f, y
In order to set the interval between the ED elements f', y' to 7%, the LED array chips f, !, as shown in FIG. The end of I must be cut off at a distance ΔXL of 30 μm from the LED elements f', y'. Although the above-mentioned processing is possible with current technology, it requires a lot of effort to perform the processing with high precision, and there is a drawback that this leads to an increase in costs.

Therefore, as shown in Figure 2, each LED array chip
, y are arranged in a staggered manner, each LED array chip f,
Distance D between LED elements f' and y' at the connection point of y
It is easy to set L to 60 μm. However, since this method requires two sets of optical systems, it is difficult to adjust the alignment of both optical systems, and the cost is high.

Furthermore, when self-hock lenses are used in the collective optical systems c and d, there is a problem in that illuminance unevenness occurs between the collective optical systems c and d, as shown in FIG.

Also, song 111! JC' is the illuminance unevenness of collective optical system C, d'
indicates the illuminance unevenness of the collective optical system d.

OBJECT OF THE INVENTION The present invention has been made to solve these problems, and it is an object to provide an optical information writing device with less uneven illuminance at a low cost.

Structure of the Invention Light information emitted from a group of LED elements arranged in a straight line is projected onto an information carrier by a collective optical system consisting of a lens array that integrates a plurality of lenses, and LEDs adjacent to each other on the information carrier are projected. An optical information writing device that writes optical information onto an information carrier by aligning images from elements located at the ends of a group of elements.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings shown in FIG. 5 and below. In the figure, reference numeral 1 denotes a LIL''D array, in which a plurality of LED array chips 2 are arranged in a straight line on a substrate 1α.
fLL LED element group 3 is provided, and these LE
The distance between each LED array chip 2 is set so that the distance between the D element group 3 is cLLL. Reference numeral 4 denotes a light shielding member provided between each of the LED element groups 3 (this light shielding member may not be provided), and a diaphragm plate 5 having a circular or polygonal through hole 5α on the light shielding member 4. is provided, and a collective optical system 6 is placed above the diaphragm plate 5. Note that the aperture plate 5 may be provided above the collective optical system 6. The collective optical system 6 is composed of a lens array 7 that integrates a plurality of lenses 7α having optical axes at the center of each LED element group 3, and optical information output from each LED element group 3 is aggregated by each lens 7α. It is projected onto the information carrier 8 provided above the optical system 6 as an inverted real image with a length of 77''LL', and at this time, the principal light 11i19 emitted from the element 3α located at the end of the LED element group 3 and , this element 3α
The principal rays 10 emitted from the elements 3b at the opposite end of the LED element group 3 adjacent to the LED element group 3 coincide on the information carrier 8.

The projection magnification m of the lens 7α is m-I JJ'L L'
/jVpx, 1, and is configured so that m<1.

Furthermore, by setting yi<+, the distance ttbb between adjacent elements 3α and 36 of each LED element group 3 can be made sufficiently larger than the distance dL between each LED array chip 3, and as a result, the LED array LED at the end of chip 2
There is no need to cut at a short distance from the end of the element group 3, making processing easier. In addition, since the LED element group 3 arranged in one row is projected by a single collective optical system 6, the illuminance distribution on the information carrier 8 is determined by 4θ, and even if there is a difference in illuminance, it can be easily You will be able to make corrections.

Effects of the Invention As described in detail above, the present invention provides LEDs arranged in a row.
The optical information from the element group 3 is projected onto the information carrier 8 by a single collective optical system 6, and the elements 3α, 3b located at the ends of the LED element groups 3 adjacent to each other on the information carrier 8
Since the images of the spiders match, it becomes possible to arrange the LED array chips 2 in a straight line without requiring highly accurate processing, and it becomes possible to provide an optical information writing device at a low cost. Furthermore, even if irregular illuminance occurs in the collective optical system 6, it is possible to easily correct this.

[Brief explanation of the drawing]

1, 2, 3(a), 4(b), and 4 are explanatory diagrams of a conventional writing device, and FIG. 5 is a perspective view of a writing device according to an embodiment of the present invention. FIG. 6 is a sectional view of the same. 2 is an LED array chip, 3 is an LED element group, 6 is a collective optical system, and 6 is an information carrier. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 1 Figure 2 Figure 3 (A) Figure 4 Overlap Coefficient -

Claims (1)

[Claims] The optical information emitted from each LED element group 3 of the LED array chips 2 arranged in one row is projected onto the information carrier 8 by the collective optical system 6, and the LED element groups 3 adjacent to each other on the information carrier 8 are projected. An optical information writing device in which optical information from elements 3α and 3b located at the ends of the device coincide with each other.