JPH03144524A - Optical scanning device - Google Patents

Abstract

PURPOSE:To stably emit a light signal for a long period by providing a rotary part with a power generating means for driving a light emitting means. CONSTITUTION:When the rotary part 4 rotates, the magnetic field produced by a permanent magnet 13 provided to a fixed magnet ring 12 crosses the power generating coil 11 of the rotary part 4, an electromotive force is generated by the power generating coil 11, and the current generated with the electromotive force is used for the light emission of an LED 10. Electric power for driving the LED 10 as a light emission source for scanning light is supplied from the power generating coil 11 by utilizing the rotational power of the rotary part 4, so there is no defective contact between slide contacts of a fixed part and the rotary part. Further, when a signal is transmitted, a light signal (modulated light) obtained by converting an electric signal by a conversion part is sent and reconverted by a photodetecting element 9 into the electric signal, which is inputted to the LED 10, so the signal transmission is carried out without any contact between the fixed part and rotary part. Consequently, stable light emission can be secured and the reliability is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention aims to improve the reliability of an optical scanning device that converts electrical signals from a fixed part into optical signals and performs rotational scanning from a rotating part. .

[Conventional technology]

Conventionally, in an optical scanning device that emits an electric signal from a fixed part as an optical signal from a rotating part, a contact is provided between the fixed part and the rotating part in sliding contact with each other in order to drive the light emitting means of the rotating part. was provided, and power was supplied from the power source of the fixed part to the light emitting means of the rotating part via this contact.

[Problem to be solved by the invention]

However, in the above-mentioned conventional device, the sliding contact for supplying power from the fixed part to the rotating part has a problem of poor contact due to long-term use, making it impossible to maintain stable operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical scanning device capable of emitting a stable optical signal over a long period of time from a light emitting means of a rotating part. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides an optical scanning device that emits an optical signal from a light emitting means of a rotating part along its rotation locus based on an electric signal of a fixed part. Electric power generation means is provided for driving the light emitting means.

[Effect]

The light emitting means of the rotating section is supplied with electric power generated by a power generating means provided in the rotating section. As a result, the light emitting means is driven, and an optical signal based on the electric signal from the fixed portion is emitted from the light emitting means.

The electric signal of the fixed part is a signal obtained by converting image information manually inputted from a copying machine, facsimile machine, etc., voice information inputted from a telephone set, etc.

This electrical signal is either given as is to the light emitting means of the rotating part, or it is converted into an optical signal by the signal transmission light emitting means of the fixed part and sent to the rotating part in the form of an optical signal, and the rotating part converts this optical signal into an electrical signal. After the light is converted into , it is applied to the light emitting means of the rotating part.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings. This embodiment is an example in which the optical scanning device of the present invention is applied to an optical printer.

FIG. 1 shows the overall configuration of an optical printer. In the figure, 1 is a converting section that converts an electrical signal based on image information into an optical signal, and 2 is a light emitting section that emits light in accordance with the converted optical signal. A light emitting surface of the light emitting section 2 is provided to face one side of a drum-shaped rotating section 4 that is rotationally driven by a motor 3 .

On the other hand, on the above-mentioned side surface of the rotating section 4, a ring-shaped inlet is provided at a portion facing the light emitting section 2 as the rotating section 4 rotates, in order to introduce the light emitted from the light emitting section 2 into the rotating section 4. 5 is formed. A cylindrical mirror 6 whose inner surface is a mirror surface and whose diameter is tapered backward is provided behind the introduction port 5 in order to reflect the introduced light toward the center of the rotating part 4. ing. Furthermore, in the center of the rotating part 4,
In order to guide the light reflected by the mirror 6 to the light-receiving surface of the light-receiving element 9 provided on the rotation axis of the rotating part 4, a conical cylinder-shaped mirror 7 whose outer surface is mirror-finished and a condenser lens 8 are used. It is provided.

As shown in FIG. 2, the light receiving element 9 is connected to an LED lo, and the electric signal converted by the light receiving element 9 is sent to the LED.
It is designed to be input to DIO. Also, LEDI
A power generating coil 11 is provided in the rotating section 4 in order to generate electric power for driving the motor. The power generation coil 11 is
As shown in FIGS. 1 to 3, they are provided on the outer circumferential surface of the rotating portion 4 at regular intervals along the circumferential direction.

Further, a magnet ring 12 is provided surrounding the outer peripheral surface of the rotating portion 4 for causing the power generation coil 11 to generate an electromotive force. The magnet ring 12 has a power generation coil 11
Permanent magnets 13 are provided at equal intervals in correspondence with the above. The rotating part 4 is rotationally driven by the motor 3, but the magnet ring 12 is fixed to the fixed part side. LEDI
O is provided on the other side of the rotating section 4 opposite to the motor 3, so that the light emitted from the LEDIO is emitted parallel to the rotation axis of the rotating section 4.

In order to guide the emitted light from the LEDlo to the photosensitive drum 15, a circular/linear optical scanning converter 14 is provided between the rotating section 4 and the photosensitive drum 15, as shown in FIG. 1 or 4. It is being The circular/linear optical scanning converter 14 has a large number of optical fibers 14a bundled into a cylindrical shape at one end and linearly arranged at the other end. The LEDIO is provided facing the circumference to be scanned, and the other end of the straight line is connected to the photosensitive drum 1.
The photosensitive drum 15 is provided facing the outer circumferential surface of the photosensitive drum 15 parallel to the axial direction of the photosensitive drum 15 .

On the outside of the photosensitive drum 15, along the rotation direction thereof, there is a charger 16 that negatively charges the photosensitive drum 15, a toner sprayer 17 that puts toner on the photosensitive drum 15, and an image on the photosensitive drum 15 is recorded. A transfer device 19 that transfers the image onto the paper 18, a charge remover 20 that removes the charge from the photosensitive drum 15,
A cleaner 21 for removing toner remaining on the photosensitive drum 15 after transfer is sequentially provided. Furthermore, a halogen lamp 23 for fixing the image transferred by the transfer device 15 onto the recording paper 18 is provided in the line along which the recording paper 18 is fed by the paper feeding roller 22 .

Next, the operation of this embodiment will be described.

Image signals (electrical signals) obtained by reading one image in a line are sequentially sent to the converter 1 from an image reading device (not shown). The converting section 1 converts this electrical signal into an optical signal, and the light emitting section 2 emits light in response to this optical signal. The optical signal emitted from the light emitting section 2 passes through the inlet 5 and enters the rotating section 4.
The light is introduced into the interior, reflected by mirrors 6 and 7, condensed by condensing lens 8, and irradiated onto the light receiving surface of light receiving element 9, where it is converted into an electrical signal. The electrical signal converted by the light receiving element 9 is input to the LEDIO, and an optical signal corresponding to the input electrical signal is emitted from the LEDIO.

When the rotating part 4 rotates, the fixed magnet ring 1
The generating coil 11 of the rotating part 4 crosses the magnetic field generated by the permanent magnet 13 provided in the rotating part 2, and as a result, an electromotive force is generated in the generating coil 11.

The current generated by this electromotive force is rectified by a rectifier 25, as shown in FIG. 2, and is used for light emission of the LEDIO.

The rotational speed of the rotating part 4 driven by the motor 3 is L
The optical signal for one pixel emitted from the EDlo is controlled to be sequentially input into each optical fiber 14a of the circular/linear optical scanning converter 14 in synchronization. Therefore, the optical signal for one pixel emitted from the LEDIO is sequentially input to each adjacent optical fiber 14a of the converter 14, and
a, and is irradiated onto the photosensitive drum 15 from its output end.

Since one rotation of the rotating section 4 provides image signals for l lines in the axial direction of the photosensitive drum 15, the rotation of the photosensitive drum 15 is drive-controlled in synchronization with the rotation of the rotating section 4. In this way, by sequentially sending a plurality of line-shaped image signals from the LEDIO of the rotating section 4, the entire image is sent onto the photosensitive drum 15.

When light hits the photosensitive drum 15, which has been negatively charged in advance by the charger 16, that part loses its charge, and the toner sprayed from the toner sprayer 17 adheres to the part that has lost its charge, and is recorded by the transfer device 19. The image is transferred onto paper 18. Recording paper 1 after transfer
8 is sent by the paper feed roller 22 and printed out. At the same time, after the photosensitive drum 15 has been transferred, the negative charge is removed by the charge remover 20, and then the toner remaining without being transferred is removed by the cleaner 21, and the photosensitive drum 15 returns to its initial state. L in the initial state of the optical scanning device in this example
The position of EDIO is as shown in Figure ■ or Figure 4.
This position corresponds to the output end of the circular/linear optical scanning converter 14.

In this embodiment, the power for driving the LEDlo, which is the light emitting source of the scanning light, is supplied from the power generation coil 11 using the rotational power of the rotating part 4, without being supplied from the fixed side. , there is no problem of poor contact due to sliding contacts between the fixed part and the rotating part. Furthermore, in signal transmission, instead of directly introducing the electrical signal from the converter 1 into the LED II, the converter 1 converts the electrical signal and sends it as an optical signal (modulated light), which is then sent to the light receiving element 9. Since the signal is returned to an electric signal and inputted to the LED 11, signal transmission is performed without contact between the fixed part and the rotating part, and stable optical scanning can be achieved over a long period of time.

In addition, in the above embodiment, the power generation coil 11 and the permanent magnet 13
Although power is generated using a power generation device (power generation means) consisting of the following, a solar cell may be provided in the rotating part 4 to generate power.

In this case, for example, a solar cell is provided at the center of the end face of the rotating part 4, and light is applied to this solar cell from a light source or external light using an optical fiber or the like.

Furthermore, in the above embodiment, the light emitted from the light emitting section 2 is incident on one side of the rotating section 4, but a light introduction port is formed on the outer peripheral surface of the rotating section 4 so that the light is directly incident on the mirror 7. You may also do so. Alternatively, the light from the light emitting section 2 may be guided to the light receiving element 9 using a conical light guide 24 as shown in FIG.

〔Effect of the invention〕

As is clear from the detailed description above, according to the present invention, the rotating part is provided with the power generating means and the generated power is used to drive the light emitting means of the rotating part, so the driving power source is not connected to the fixed part. There are no problems such as poor contact in conventional devices in which power is supplied to the light emitting means of the rotating part through sliding contacts, stable light emission can be ensured, and the reliability of the optical scanning device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example in which an embodiment of the optical scanning device according to the present invention is applied to an optical printer, FIG. 2 is a circuit diagram for explaining signal transmission in the optical scanning device, and FIG. 3 4 is a plan view of the circular/linear optical scanning converter shown in FIG. 1, and FIG. FIG. 7 is a diagram showing another example of signal transmission. 1... Conversion section 2... Light emitting section 3... Motor 4... Rotating section 5... Inlet port 6, 7... Mirror - 8... Condensing lens 9... Light receiving Element 10...LED 11...Generating coil 12...Magnet ring 1 3...Permanent magnet 4...Circular/linear optical scanning converter 4a...Optical fiber 5...Photosensitive drum 6. ... Charger 7 ... Toner injector 8 ... Recording paper 9 ... Transfer device 0 ... Charge remover 1 ... Cleaner 2 ... Paper feed roller 3 ... Halogen lamp 4. ... Light guide 5 ... Rectifier

Claims (1)

[Claims] An optical scanning device that emits an optical signal based on an electric signal from a fixed part from a light emitting means of a rotating part along its rotation locus, wherein the electric power generation means for driving the light emitting means comprises the power generating means for driving the light emitting means. An optical scanning device characterized in that it is provided in a rotating part.