JPS6246578A - Led head - Google Patents

Abstract

PURPOSE:To reduce the troubleness of adjustment on the assembly of an optical printer by previously positioning and fixing an LED array and a focussing optical transmission body to a radiator plate through a holder. CONSTITUTION:Positional relationship between a light-emitting section 2 for an LED array 1 and a focussing optical transmission body 4 is determined by machine accuracy through a radiator plate 5 and a holder 6, thus eliminating the need for troublesome assembly adjustment work. Consequently, a space and a distance between the focussing optical transmission body4 for the LED head and the surface of a photosensitive body may be adjusted so as to reach a fixed value on the manufacture and assembly of an optical printer. Accordingly, man-hours for assembling and regulating the optical printer are reduced, and stable products having high precision can be acquired.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This invention relates to an LED head used as a light emitting element in an optical printer.

tb) Prior Art Some optical printers using LEDs as light emitting elements use a convergent light transmitter (trade name: "Selfoc Lens") as an optical system. As shown in FIG. 4, this convergent light transmitter is constructed by setting the distance between the light emitting section 2 of the LED array and the photoreceptor surface 3 to a specified distance TC between the object and image planes, and the light emitting section 2 and the photoreceptor surface 3. The predetermined resolving power cannot be obtained unless they are arranged so that the distance between them and the distance between them is equal to 20.

For this reason, conventionally, at the manufacturing and assembly stage of optical printers,
LED array 1. Photoreceptor surface 3 and focusing light transmitter 4
It is necessary to adjust the positional relationship between the two, which increases the number of steps for assembly and adjustment, and has the disadvantage that highly accurate adjustment is difficult.

(C1 Purpose of the Invention This invention was made in view of the above circumstances, and it is possible to position and fix the LED array and the convergent light transmitter to the heat sink via a holder in advance. An object of the present invention is to provide an LED head that can reduce the troublesome adjustment when assembling the LED head.

(d+ Structure and effect of the invention) The LED head of this invention is an LED head mounted on a heat sink.
A convergent light transmitter is arranged above the D array so that the optical axis distance from the light emitting part of the LED array is a predetermined value, and both ends of the convergent light transmitter are connected to a heat sink through a holder. It is characterized by being positioned and fixed.

When the LED head of this invention is configured as described above, L
The positional relationship between the ED array and the convergent light transmission body is determined by the mechanical accuracy of the holder and the heat sink, and fine adjustments can be made at the component stage, making it easy to make highly accurate adjustments. Therefore, at the manufacturing and assembly stage of the optical printer, it is only necessary to adjust the positional relationship between the LED head and the surface of the photoreceptor, which simplifies the adjustment work and reduces the number of work steps. . Therefore, the LED head of the present invention can contribute to reducing the manufacturing cost of optical printers and improving printing quality by increasing precision.(e) Embodiment FIG. 1 shows an embodiment of the present invention. FIG. 2 is a plan view of the LED head, FIG. 2 is a front view of the LED head, and FIG. 3 is an enlarged left side view of the LED head.

The LED head of the present invention includes an LED array 1° and a heat sink 5.
．． It is composed of a convergent light transmission body 4 and a holder 6. The LED array 1 has a light emitting section 2 by arranging a large number of LED elements in a line. The heat sink 5 is a long plate made of aluminum or the like for dissipating the heat generated by the LED array 1. LED array 1 is
It is arranged along one long side of the heat sink 5. Note that a driving IC 7 is arranged on the heat sink 5 inside the LED array 1, and further covered above with a cover glass 8. This cover glass 8 is filled with an inert gas such as nitrogen gas and surrounded by a resin material 9.
This is to protect the LED elements and wiring by sealing them with. In addition, on the other side of this heat sink 5, the wiring of the drive TC1 is pulled out as a flexible cable,
This upper part is covered and protected by a cover 10. The end of the flexible cable is connected to a connector 11 provided protruding from the back surface of the heat sink. The holder 6.6 is securely fastened to both ends of the heat sink 5 in the longitudinal direction with bolts 12. When this holder 6 is attached to the heat sink 5, the height of the upward surface 13 of the lens mounting section provided above and the light emitting section 2 of the LED array 1 also attached to the heat sink 5 is set. It is processed with high precision so that the positional relationship is a predetermined distance. Both ends of the convergent light transmitting body 4 are placed on the upward facing surface 3 of the lens mounting section, and the L
The holder 6 is placed so as to cover the upper part of the light emitting part 2 of the ED array 1.
The tightening is fixed. In addition, this convergent light transmission body 4
Notches 15 are provided at both ends by machining,
The lower end surface of this notch 15 and the upwardly facing surface 13 of the lens mounting portion of the holder 6 are in contact with each other. The reason why such notches 15 are provided at both ends of the convergent light transmitter 4 is that this convergent light transmitter is made by arranging a large number of optical fibers and hardening them with a resin material. Rather than positioning by the distance 10 between the two, it is better to position so that the distance between the center of the optical axis distance of the convergent light transmitter and the light emitting part 2 of the LED array A1 is half the distance between the object and image planes TC. This is because they can be placed more accurately. For this reason, the lower end surface of this notch 15 is precisely processed so as to be at a predetermined distance from the center of the optical axis distance of the convergent light transmitting body 403.

The LED head of this embodiment configured as described above is as follows:
Since the positional relationship between the light emitting section 2 of the LED array 1 and the convergent light transmitting body 4 is determined by mechanical precision via the heat sink 5 and the holder 6, troublesome assembly and adjustment work is unnecessary. Therefore, when manufacturing and assembling an optical printer, it is only necessary to adjust the distance between the convergent light transmitting body 4 of the LED head and the surface of the photoreceptor to a predetermined value. It is possible to reduce man-hours and obtain stable and highly accurate products, contributing to lower product costs and improved quality.

[Brief Description of the Drawings] Fig. 1 is a plan view of an LED head according to an embodiment of the present invention, Fig. 2 is a front view of the same LED head, and Fig. 3 is an enlarged left side view of the same LED head. , FIG. 4 is a front view for explaining the arrangement of convergent light transmitters in an optical printer. 1-LED array, 2-light emitting section, 4-focusing light transmission body, 5-heat sink, 6-holder.

Claims (1)

[Claims] (1) A convergent light transmitter is placed above the LED array mounted on the heat sink so that the optical axis distance from the light emitting part of the LED array is a predetermined value, and the convergent light transmitter is An LED head characterized in that both ends are positioned and fixed to a heat sink via a holder.