JPS62127867A - Led recording head - Google Patents

Abstract

PURPOSE:To shorten the width of a head in the peripheral direction of a photosensitive drum, and to miniaturize an LED printer by outputting the output light of an LED recording head from a head side end face by a mirror. CONSTITUTION:As for a microlens array 3 and a mirror 5, its positions are set so that a light beam emitted from an LED array 2 is reflected in the direction of a head side end part by the mirror 5, passes through the microlens array 3, and an image is formed on a photosensitive drum 4. In this regard, the adjustment of an image forming position of an emitted light is executed by the microlens array 3 or the mirror 5. Also, by an integrating jig 6 for integrating the mirror 5 and the microlens array 3, the number of parts is decreased, and its position can be easily adjusted. In this way, the width of a head in the peripheral direction of the photosensitive drum can be shortened, and an LED printer can be made small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an LED recording head used as a recording light source of an electrophotographic recording apparatus.

[Conventional technology]

Fig. 4 shows a conventionally known LED recording head (Suzuki et al.: Journal of the Electronic Printing Society, Vol. 24. ff12 PP3l).
36 (1985)) and a typical structure of a photosensitive drum, and FIG. 3 does not show an LED board on which an LED array row is formed at the end of the head. In both figures, ■ is an LED board made of an insulating material such as ceramic with a conductive pattern formed on its surface, 2 is an LED array chip formed by integrating multiple LEDs, and 3 is an image-forming device for light from the LEDs. This is a driver IC that includes a microlens array used in the 9th generation and 9th generation memory.

The output light of the LED recording head configured as described above is imaged on the photoreceptor drum 4 to create an electrostatic WJ (l#!), and this latent image is developed using toner and transferred and fixed on the paper surface. Electronic photographic recording is performed.

[Problem that the invention seeks to solve]

The conventional LED recording head has a wide width in the circumferential direction of the photoreceptor drum of the LED recording head, and the LED electrophotographic recording device (
This method was inappropriate for miniaturization of LED printers (hereinafter referred to as LED printers). Here, in addition to the LED recording head, it is necessary to install devices such as a developing device, a transfer device, a fixing device, an erasing head, and a cleaning device around the photosensitive drum. It was necessary to eliminate one yen in the circumferential direction of the photoreceptor.

This invention was made in order to solve the above-mentioned conventional problems, and it is an LED printer that can achieve miniaturization of LED printers without increasing manufacturing costs or deteriorating performance.
The purpose of the present invention is to provide a D recording head.

Another object of the present invention, in addition to the above object, is to obtain an LED recording head that provides an LED printer with high printing speed or high resolution.

[Means for solving problems]

The LED recording head according to the present invention is provided with a mirror that changes the optical path of light from the LED array, and outputs the light from a narrow end face on the head side.

Further, an LED recording head according to another invention of the present invention includes:
A plurality of recording heads having the above configuration are combined to share the recording duties.

(Function) In this invention, since the light from the LED array is outputted from the head side end surface, the width of the LED recording head output section can be made narrower, and the space around the photoreceptor drum can be effectively used. can be made smaller.

Further, in another aspect of the present invention, a plurality of recording heads are combined and each head is responsible for recording, so that the recording speed can be increased or the resolution can be increased.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1.
Reference numeral 2 denotes an LED board and an LED array chip as in the conventional device, but these are installed near the end face on the head side. In addition, the microlens array 3 and the mirror 5
The position of the LED array 2 is set so that the light emitted from the LED array 2 is reflected by the mirror 5 toward the head side end, passes through the microlens array 3, and is imaged on the photoreceptor drum 4. In this recording, the imaging position of the emitted light is adjusted by the microlens array 3 or the mirror 5. Further, 6 is an integration jig for integrating the mirror 5 and the microlens array 3, which can reduce the number of parts and facilitate the position adjustment.

In this embodiment, the circumferential width of the photosensitive drum of the head can be reduced to 10 m5 or less compared to the conventional 7011, and the LED printer can be made smaller without increasing manufacturing costs or deteriorating performance. .

Another embodiment of this invention is shown in FIG.

In the figure, reference numeral 7 indicates an LED recording head having the above configuration, and in this apparatus, two of these heads 7 are combined and integrated by a jig 8. In this apparatus, the two LED recording heads 7 share the recording duties in the scanning direction or the sub-scanning direction, thereby increasing the resolution of the recording heads of the entire apparatus, increasing the recording speed, or increasing the recording speed. You can do both.

〔Effect of the invention〕

As described above, according to the present invention, the output light of the LED recording head is output from the head side end surface using a mirror, so the width of the head in the circumferential direction of the photoreceptor drum can be reduced, thereby making it possible to can achieve miniaturization.

Further, according to another invention of the present invention, an LED having the above configuration
Since a plurality of recording heads are combined, each head can further share the responsibility of recording, making it possible to improve resolution or recording speed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an LED recording head according to one embodiment of the present invention, FIG. 2 is a diagram showing an LED recording head according to another embodiment of the present invention, and FIG. 3 is a diagram showing a conventional typical LED recording head. Figure 4 shows a conventional LED recording head.
FIG. 2 is a configuration diagram showing a recording head and a photosensitive drum. 2... LED array, 3... Microlens array, 5... Mirror, 6... Integration jig, 7... LE
D Record (・' Single unit, 8... Jig. The same reference numerals in the diagram indicate the same or equivalent parts. 3:7 Gokuolunne °7〉I4゛゛゛。/or 5S Curro, - It's Me Figure 2 1LEo7 Figure 4
2: LED, 'Shi f3.7 nok, /nn7'shi4 4 (,, f'doda/゛gaj, i' 3 τ Procedure ifl original (self-prompted) February 2, 1988 2 Title of the invention: LED recording head 3, Person making the amendment Relationship to the case: Patent applicant 5, Detailed explanation of the invention in the specification subject to amendment 6, Contents of the amendment (1) Page 3, line 4 of the specification Correct "1, ED" to "f from LI: in the center of the LIED board 1." (2) Insert the following sentence after "1, ED" on page 6, line 5 of the same. "Also, in FIG. 1, LED array row 2 is LED
However, since the optical path length between the LED array row 2 and the photoreceptor drum 4 is relatively short, the LED
The array row 2 may be formed near the emission side end of the LED base plate 1. "that's all

Claims (4)

[Claims] (1) Multiple light emitting diodes (hereinafter referred to as LE) on one chip
A microlens array for condensing light from the LED array and guiding it to the outside, and an optical path changing device provided between the LED array and the microlens array. 1. An LED recording head comprising: a mirror; wherein output light from the LED array is output from a narrow end face on the head side. (2) The LED recording head according to claim 1, wherein the optical path changing mirror is installed integrally with the microlens array. (3) Multiple light emitting diodes (hereinafter referred to as LE) on one chip
A microlens array for condensing and guiding light from the LED array to the outside, and an optical path provided between the LED array and the microlens array. 1. An LED recording head comprising a combination of a plurality of recording heads including a changing mirror and outputting light from the LED array from a narrow end face on the head side. (4) The LED recording head according to claim 3, wherein in the recording head, the optical path changing mirror is installed integrally with the microlens array.