JPH0570069U - Optical head for read / write device - Google Patents

Abstract

(57) [Abstract] [Purpose] A light source for writing and two optical axes as a reading sensor can be obtained without moving the read / write head, thereby making the device compact, reducing the number of parts, and preventing defocus. Try to. [Structure] The upper surface of an LED 63 that performs either reading or optical writing of the original 5 and the above-described LED 6 that performs one of reading or optical writing of the original 5 opposite to the upper surface.
3 is exposed and provided on the LED array 61, and the converging rod lens array 6 is provided on the optical axes a and b of the upper surface and the end surface.
5 are arranged respectively.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an optical head for a reading / writing device used when copying an original using the photoconductive effect.

[0002]

[Prior Art]

 A so-called multi-mode device for reading an original and writing an image copy has a problem that the mechanism is complicated and the manufacturing cost is increased. As an example of this type of device in which an optical head is movably attached to reduce the manufacturing cost, for example, a device described in Japanese Patent Application No. 58-114147 will be described with reference to FIGS. 4 is a perspective view showing a conventional read / write device, FIG. 5 is a detailed view of a read / write unit, FIGS. 6 and 7 are explanatory views of a read / write element, FIG. 8 is a control circuit diagram, and FIG. 9 is a perspective view showing an LED array. Is. As shown in FIG. 4, a document 5 is placed on the platen 3 of the reproducing device 1, and the document 5 is transported by a document feeding roller 7 provided on the platen 3. A document scanning opening 9 is provided in the platen 3, and the document scanning opening 9 is formed with a width that traverses the transport direction of the document 5. A drum-shaped image receiver 11 is rotatably provided below the platen 3, and a discharge device 13 that charges the image receiver 11 with an electrostatic charge is provided near the image receiver 11. A developing device 15 is provided near the image receiving device 11, and the developing device 15 develops the electrostatic latent image on the surface of the image receiving device 11. The electrostatic latent image developed by the developing device 15 is conveyed to a transfer portion adjacent to the image receiving device 11 and transferred from the image receiving device 11 to a copy sheet 17.

On the other hand, an LED array 21 is provided below the document scanning opening 9. The LED array 21 is one in which a plurality of LEDs 25 are integrated on a substrate 23 on a single chip (see FIG. 9), and the chip upper surface (A portion in FIG. 9) is the light emitting side. A circuit for driving the LED 25 is connected to each of the LEDs 25 by an electrode such as a gold wire on the electrode 26 (see FIG. 9) of the LED array 21. The LED array 21 is formed by selectively diffusing zinc (Zn) in a gallium-arsenic-phosphorus (GaAsP) wafer to form a light emitting portion, that is, an LED 25 portion. The LED array 21 functions as two illumination sources during the reading operation to read the original portion facing the original scanning opening 9 and to illuminate the original 5 portion facing the original scanning opening 9. For example, as shown in FIG. 6, every other LED 25-1, 25-3, 25-5, ... Is connected to the power supply 27 to illuminate the document 5 and the remaining LEDs 25-2, 25-4, 25-. 6 ... Functions as a photodetector. Further, as another example of the illumination order, as shown in FIG. 7, LEDs 25-2, 25-5, ... Are illuminated for LE D 25-1, 25-3, 25-4, 25-6 on both sides thereof. Things to do are possible.

A converging rod lens array 29 is provided above the LED array 21, and an image of the LED 25 is formed on the focal plane of the converging rod lens array 29. An optical head (reading / writing head) 31 for a reading / writing apparatus is configured with the LED array 21 and the converging rod lens array 29 as main members. By the way, as shown in FIG. 5, the read / write head 31 is rotatable about the pin 33 so that it can be selectively moved between the read position and the write position. Therefore, the read / write head 31 is rotated about the pin 33 to move in a 90 ° arc between the image receiver 11 and the document scanning opening 9.

Further, as shown in FIG. 8, in the drive circuit of the read / write head 31, an LED group control switch 35, an individual LED control switch 37, OR function gates 39 and 41, shift registers 43 and 45, a selection switch 47, An amplifier 49, an image signal source 51 and the like are provided respectively, and the LED 25 is controlled by either reading or writing operation.

The operation of the conventional read / write head 31 thus configured will be described. First, during the reading operation, the read / write head 31 is arranged so that the optical axis is aligned with the document scanning opening 9, and the selection switch 47 of the read / write head 31 is switched to read. Next, the read document 5 is scanned on the document scanning opening 9 by the platen 3 and the document feeding roller 7. At this time, the odd-numbered LEDs 25 of the read / write head 31 emit light, are reflected by the read / write head 31 due to the pattern on the document surface, and enter the even number of LEDs 25. A weak current is generated in the LED 25 by the incident light, and this current is amplified by the amplifier 49 to read the original pattern. On the other hand, during the writing operation, the read / write head 31 is rotated around the pin 33 so that the optical axis is aligned with the image receiver 11, and the selection switch 47 of the read / write head 31 is switched to write. Subsequent operations are written according to the electrophotographic process. That is, a uniform surface potential is formed on the surface of the image receiver 11 by the discharge device 13, and then each LED 25 of the read / write head 31 emits light according to the image signal source 51, so that the surface potential on the image receiver 11 is changed. Toner is attached to the attenuated portion by the developing device 15, and the toner is transferred to the copy sheet 17 at the transfer portion to perform writing.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned multimode device, a space in which the read / write head 31 is rotationally moved at the time of reading / writing must be ensured in the device, which is an obstacle to downsizing the device. In addition, a drive motor for rotation and a control device are required, which makes the entire device complicated. Further, in the above-described multi-mode device, since the read / write head 31 is mechanically operated, the rotating shaft (pin 33) is easily worn, and the read / write performance is deteriorated because the read / write head 31 is out of focus. was there.

The present invention has been made in view of the above circumstances, and provides an optical head for a read / write device, which can obtain two optical axes as a write light source and a read sensor without rotating the read / write head. The objective is to downsize the device, reduce the number of parts, and prevent defocus.

[0009]

Means for Solving the Problems To achieve the above object, the optical head for a reading / writing device according to the present invention has a structure in which an upper surface of an LED for reading or writing an original and reading an original, or One of the optical writing operations is performed on the upper surface and the other end surface of the LED is exposed to provide the LED array, and the converging rod lens arrays are respectively arranged on the optical axes of the upper surface and the end surface. It is a feature.

[0010]

[Action]

 The upper surface and the end surface of the LED are provided in the LED array in an exposed state, and the converging rod lens arrays are respectively arranged on the optical axes of the upper surface and the end surface. When the LED array emits light, a direction orthogonal to the upper surface, Also, light is emitted in two axes perpendicular to the end face, and it is possible to read or write an original from one fixed position without moving the LED array.

[0011]

【Example】

 Hereinafter, preferred embodiments of an optical head for a read / write device according to the present invention will be described in detail with reference to the drawings. 1 is a detailed view of an optical head for a read / write device according to the present invention, FIG. 2 is a detailed view showing an LED array of the optical head for a read / write device according to the present invention, and FIG. 3 is an explanatory view of the read / write device. The same members as those shown in FIGS. 4 to 9 are designated by the same reference numerals, and a duplicate description will be omitted. As shown in FIG. 2, the rod-shaped LED array 61 is provided with a plurality of LEDs 63 in the longitudinal direction. The LED array 61 is manufactured by substantially the same manufacturing method as the conventional technique, but when the chip is cut out from the GaAsP wafer, it is cut out across the light emitting side. Therefore, when the LED array 61 emits light, the light is emitted in two axes of a direction orthogonal to the upper surface A (optical axis a direction) and a direction orthogonal to the end surface B (optical axis b direction). Of. The LED array 61 thus configured is connected and arranged on the substrate 23 in the same manner as in the conventional case, and is connected to the drive circuit via the electrode 26 by a gold wire or the like.

As shown in FIG. 1, a converging rod lens array 65 is arranged on each of the optical axis a and the optical axis b of the LED array 61. Therefore, the LED light on the upper surface A (optical axis a) side forms an image on the read document 5, and the LED light on the end surface B (optical axis b) forms an image on the surface of the image receiver 11. That is, the LED array 61 can illuminate both the document 5 and the image receiver 11 from one fixed position without moving. An optical head (reading / writing head) 67 for a reading / writing device is configured by mainly using the LED array 61 and the converging rod lens array 65.

The operation of the read / write head 67 configured as described above is the same as the conventional one except that the read / write head 67 itself is fixed. That is, as shown in FIG. 3, during the reading operation, the selection switch 47 (see FIG. 8) of the read / write head 67 is switched to reading, and the read original 5 is placed on the original scanning opening 9 (see FIG. 4) on the platen 3. , And is scanned by the document feed roller 7 (see FIG. 4). At this time, the odd-numbered LEDs 63 (see FIG. 2) of the read / write head 67 emit light, pass through the converging rod lens array 65, and illuminate the document 5. The radiated light is reflected by the read / write head 67 due to the pattern on the document surface and enters the even number of LEDs 63. A weak current is generated in the LED 63 by the incident light, and this current is amplified by the amplifier 49 (see FIG. 8) to read the original pattern. On the other hand, in the writing operation, after the selection switch 47 of the read / write head 67 is switched to the writing operation, the writing operation is performed according to the electrophotographic process. That is, a uniform surface potential is formed on the surface of the image receiver 11 by the discharge device 13, and then each LED 63 of the read / write head 67 emits light in accordance with the image signal source 51 (see FIG. 8). Writing is performed by attenuating the surface potential on 11 and adhering toner to the attenuated portion by the developing device 15 and transferring the toner to the copy sheet 17 at the transfer section 69.

In the above-mentioned embodiment, the LED light on the upper surface A (optical axis a) side of the LED array 61 is used for the reading operation, and the LED light on the end surface B (optical axis b) side is used for the optical writing operation. However, it is also possible that the upper surface A side and the end surface B side are used in reverse operations.

[0015]

[Effect of the device]

 As described above in detail, since the optical head for a read / write device according to the present invention is provided with the upper surface and the end surface of the LED exposed, when the LED array emits light, the light is emitted biaxially and the LED array is emitted. It is possible to obtain two optical axes as a writing light source and a reading sensor without moving the. As a result, the structure is simplified, the size of the device can be reduced, the number of parts can be significantly reduced, and since mechanical operation is eliminated, defocusing can be prevented and the quality of reading and writing can be significantly improved. be able to.

[Brief description of drawings]

FIG. 1 is a detailed view of an optical head for a read / write device according to the present invention.

FIG. 2 is an LED of an optical head for a read / write device according to the present invention.
3 is a detailed view showing an array. FIG.

FIG. 3 is an explanatory diagram of a reading / writing device.

FIG. 4 is a perspective view showing a conventional read / write device.

FIG. 5 is a detailed diagram of a read / write unit.

FIG. 6 is an explanatory diagram of a read / write element.

FIG. 7 is an explanatory diagram of a read / write element.

FIG. 8 is a control circuit diagram.

FIG. 9 is a perspective view showing an LED array.

[Explanation of symbols]

 5 manuscript 61 LED array 63 LED 65 convergent rod lens array 67 optical head for read / write device A upper surface B end surface a, b optical axis

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location G03G 15/04 111 9122-2H (72) Creator Hiro Hamano 1-7-12 Toranomon, Minato-ku, Tokyo No. Oki Electric Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An LED array in which an upper surface of an LED for performing one of reading and optical writing of an original and an end surface of the LED for performing one of reading and optical writing of an original in reverse to the upper surface are exposed. An optical head for a read / write device, wherein a converging rod lens array is provided on the optical axes of the upper surface and the end surface, respectively.