JP2003312029A - Optical recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guide a light beam to a photo detector in a simple and inexpensive configuration. <P>SOLUTION: In an optical recording apparatus 1 for recording on a recording medium 4 by directing a light beam from a light source 2, a part of the light beam outputted from the light source 2 is guided to a photo detector 6 by an optical fiber for detection 9. Consequently, the light beam can be guided to the photo detector 6 in a simple and inexpensive configuration. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus that records light on a recording medium by irradiating it with light from a light source.

[0002]

2. Description of the Related Art Conventionally, there is an optical recording apparatus for recording information on a recording medium by irradiating the recording medium with light from a light source.
As such an optical recording device, for example, a recording medium having a surface of a thermosensitive coloring layer coated with a light-heat conversion material is irradiated with light, and a color is developed by heat generated at the irradiation position of the light to record an image. Used in the recording method described above, or by irradiating a charged photosensitive drum with light to record an image as an electrostatic latent image on the photosensitive drum, and supplying toner to the electrostatic latent image. There is one used for electrophotographic printing in which an image is visualized and the visualized toner image is transferred to a sheet.

In such an optical recording apparatus, in order to obtain stable recording quality, it is important that the amount of light emitted from the light source is stable. Therefore, conventionally, the light amount of the light emitted from the light source is detected by the photodetector, and the light amount of the light source is controlled according to the detected amount. As a detection method in this case, there is one in which a photodetector for detecting backward light emitted toward the rear is integrally built in the unit of the light source, but the structure of the light source is actually limited. It is common to provide a photodetector for detecting a part of the light emitted forward from the light source because the correspondence with the forward light used is not always accurate.

Some of such photodetectors are arranged away from the optical axis. Therefore, a part of the light emitted from the light source is split by a half mirror or the like and guided to the photodetector. Is being carried out.

[0005]

However, by providing the half mirror in this way, there is a problem that the device becomes complicated and expensive. In addition, since light is extracted and guided to the photodetector regardless of the light intensity of the light emitted from the light source, there is a problem that the loss of light becomes large, which hinders high-speed recording.

Further, when the light source is a laser light source,
The light intensity distribution of the laser light emitted from the laser light source is usually a Gaussian distribution, which makes the light intensity distribution of the laser light irradiated on the recording surface of the recording medium non-uniform and stabilizes the recording quality. There is a problem not to do. As a method for solving this problem, Japanese Patent Laid-Open No. 2001-293893
Proposes a method of making the light intensity distribution of laser light emitted from a laser light source incident on an optical fiber to be uniform. However, in this case, if the half mirror is provided to control the light amount as described above, the half mirror and the optical fiber must be provided in order to stabilize the recording quality, which makes the device complicated and expensive. There is.

It is an object of the present invention to guide light to a photodetector with an inexpensive construction.

An object of the present invention is to guide light to a photodetector with a simple structure.

It is an object of the present invention to reduce the loss of light when directing it to a photodetector.

[0010]

The invention according to claim 1 is
In an optical recording apparatus for irradiating light from a light source to record on a recording medium, a photodetector for detecting light and a detection light for guiding at least a part of the light emitted from the light source to the photodetector. And a fiber.

Therefore, at least a part of the light emitted from the light source is guided to the photodetector by the detection optical fiber.

The invention according to a second aspect is the optical recording apparatus according to the first aspect, further comprising a recording optical fiber for guiding a part of the light emitted from the light source to the recording medium.

Therefore, a part of the light emitted from the light source is guided to the recording medium by the recording optical fiber.

According to a third aspect of the present invention, in the optical recording apparatus according to the first or second aspect, a light amount control means for controlling the light amount of the light source so that the detection amount of the photodetector becomes a predetermined reference detection amount. It is equipped with.

Therefore, the light amount control means controls the light amount of the light source so that the detection amount of the photodetector becomes a predetermined reference detection amount.

According to a fourth aspect of the present invention, in the optical recording apparatus according to the first, second, or third aspect, the reflected light emitted from the light source and reflected by the recording medium reaches the recording medium from the light source. The light emitted from the light source is obliquely applied to the recording medium so as not to return to the above.

Therefore, the reflected light reflected by the recording medium does not return to the light source.

The invention according to claim 5 is the invention as defined in claims 1, 2, and 3.
Alternatively, in the optical recording device described in 4, there is provided a collimating lens arranged between the light source and the recording and detection optical fibers.

Therefore, the light emitted from the light source and diverging is collimated by the collimating lens and incident on the recording and detection optical fibers.

The invention according to claim 6 is the invention as defined in claims 2, 3, and 4.
Alternatively, in the optical recording device according to 5, the portion of the light emitted from the light source having a high light intensity is incident on the recording optical fiber, and the light emitted from the light source is incident on the detection optical fiber. A portion of the light with low light intensity is incident.

Therefore, it is possible to irradiate the recording medium with light having a high light intensity that contributes to recording and guide light having a low light intensity that does not contribute to recording to the photodetector, thereby reducing the amount of light for recording. It is possible to guide the light for controlling the light amount to the photodetector without performing the above.

The invention according to claim 7 is the invention according to claims 2, 3,
In the optical recording device described in 4, 5, or 6, the detection optical fiber is arranged around the recording optical fiber.

Therefore, for example, it becomes possible to surely make light having a high light intensity out of light having a Gaussian distribution, enter the recording optical fiber, and surely make light having a low light intensity a detecting light. It becomes possible to make it incident on the fiber.

The invention described in claim 8 is the same as in claim 1,
In the optical recording device described in 3, 4, or 5, a part of a portion of the light emitted from the light source having a high light intensity is incident on the detection optical fiber.

Therefore, light with high light intensity is guided to the photodetector.

The invention according to claim 9 is the invention as defined in claims 2, 3,
In the optical recording device described in 4, 5, 6, 7 or 8, the recording optical fiber is composed of a plurality of strands, and the detection optical fiber is composed of a single strand.

Therefore, the light intensity distribution of the light passing through the recording optical fiber is not changed. Such a recording optical fiber is effective when it is not desired to change the intensity distribution of laser light. Further, since the detection optical fiber is a single strand, it is easy to integrate the detection optical fiber and the recording optical fiber.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention.
Or, it demonstrates based on FIG. The optical recording device of the present embodiment is a thermosensitive color recording type optical recording device that irradiates a recording medium having a surface of a thermosensitive coloring layer coated with a light-heat conversion material with laser light to record information on the recording medium. Is an application example of.

Here, FIG. 1 is a side view schematically showing the optical recording apparatus of the present embodiment, and FIG. 2 is a vertical sectional side view showing the drum 3 with a recording medium mounted. As shown in FIG. 1, an optical recording device 1 collects a laser light source 2, which is a light source such as a semiconductor laser emitting a laser light, and a laser light emitted from the laser light source 2 on a recording medium 4 mounted on a drum 3. Condensing lens 5 that emits light, laser light detector 6 that detects a part of the laser light emitted from laser light source 2, and laser light source 2
The optical fiber 7 guides the laser light emitted from the condenser lens 5 and the laser light detector 6 to each other. This optical recording device 1 is provided with a drum 3 by a moving means (not shown)
Is moved in the axial direction. Here, as shown in FIG. 2, the drum 3 has a recording medium 4 mounted on the outer periphery thereof and is rotated by being driven by a driving unit (not shown).

Then, the optical recording apparatus 1 guides the laser light emitted from the laser light source 2 to the condenser lens 5 by the optical fiber 7 and condenses and irradiates the laser light on the recording medium 4 by the condenser lens 5 for recording. Recording is performed on the medium 4. At this time, the optical recording device 1 guides a part of the laser light emitted from the laser light source 2 to the laser light detector 6, and controls the light quantity of the laser light source 2 based on the amount of laser light detected by the laser light detector 6. To do.

The laser light detector 6 converts the detected amount of the detected laser light into a voltage or current and outputs it as a detected amount signal.

FIG. 3 is a vertical sectional front view showing the optical fiber 7, and FIG. 4 is a front view showing the relationship between the irradiation range of the laser light and the optical fiber 7. As shown in FIGS. 1 and 3, the optical fiber 7 is composed of a recording optical fiber 8 and a detection optical fiber 9. The recording optical fiber 8 is composed of a single wire, and the detection optical fiber 9 is composed of a plurality of wires. The recording optical fiber 8 has one end facing the laser light source 2 and the other end facing the condenser lens 5. The detection optical fiber 9 has one end facing the laser light source 2 and the other end facing the laser light detector 6. At one end of the optical fiber 7 facing the laser light source 2, a plurality of strands of the detection optical fiber 9 are arranged around the recording optical fiber 8, and the recording optical fiber 8 and the detection optical fiber 9 are connected to each other. They are bundled together. Then, the plurality of strands of the detection optical fiber 9 are separated from the recording optical fiber 8 and are brought close to each other on the way from the one end facing the laser light source 2 to the other end facing the laser light detector 6. The other end facing the laser light detector 6 is bundled into one bundle. Here, as shown in FIG. 4, the irradiation range of the laser light emitted from the laser light source 2 covers the entire one end face of the optical fiber 7.

FIG. 5 is a schematic view showing the relationship between the light intensity distribution of laser light and the optical fiber 7. As shown in FIG. 5, the light intensity distribution of the laser light emitted from the laser light source 2 is usually a Gaussian distribution in which the center is high and the periphery is low. A in FIG. 5 is a region where the light intensity of the laser light is high and contributes to recording, and B in FIG. 5 is a region where the light intensity of the laser light is low and does not contribute to recording. This region B is generated because the radiation angle of the laser light is large. Then, the laser light in the region A having a high light intensity that contributes to recording is incident on the recording optical fiber 8, and the detection optical fiber 9
The laser light of the region B having a low light intensity and not contributing to the recording is incident on.

Next, the electrical connection of the optical recording apparatus 1 is shown in FIG.
It will be described based on. FIG. 6 is a schematic diagram showing the electrical connection of the optical recording device 1. As shown in FIG. 6, the optical recording device 1 includes a controller 10 that drives and controls each unit of the optical recording device 1, a storage circuit 11 that stores various data, and a power supply 12.
Light source drive circuit 13 for controlling the power supply from the laser light source 2 to the laser light source 2, and an error amplifier for detecting an error between the detection amount of the laser light detector 6 and the reference detection amount by inputting the detection amount signal from the laser light detector 6. 14 and the like are provided. Here, the reference detection amount is the detection amount to be detected by the laser light detector 6 when the laser light of the predetermined reference emission light amount is emitted from the laser light source 2, and is stored in the storage circuit 11.

Next, the laser light source 2 performed by the optical recording apparatus 1
The light amount control of will be described. First, in the light amount control, the controller 10 inputs the reference detection amount stored in the storage circuit 11 to the error amplifier 14 as a reference signal. The error amplifier 14 to which the reference signal is input detects an error between the reference detection amount included in the reference signal and the detection amount included in the detection amount signal input from the laser photodetector 6, and uses it as an error signal for the controller. Input to 10. The controller 10 to which the error signal is input calculates a correction value of the output of the laser light source 2 based on the error signal and inputs the correction value to the laser light source drive circuit 13 as a correction signal. The laser light source drive circuit 13 to which the correction signal is input controls the power supply from the power source 12 to the laser light source 2 according to the correction value included in the correction signal to correct the light amount of the laser light source 2. Thereby, the light amount of the laser light source 2 is controlled so that the detection amount detected by the laser light detector 6 becomes the reference detection amount, and the light amount of the laser light emitted from the laser light source 2 becomes the reference emission light amount. Here, the function of the light amount control means is executed.

FIG. 7 is a schematic diagram showing the relationship between the light amount control and the recording operation. Here, in FIG. 10C, the horizontal axis is the time axis,
The vertical axis represents the ON / OFF state of the recording operation of the optical recording apparatus 1, and in FIG. 10D, the horizontal axis represents the time axis and the vertical axis represents the light quantity control O.
Indicates the N / OFF state.

The light amount control as described above is, for example,
This is performed when the recording operation is not performed (recording operation OFF state). First, as shown in FIG. 2, in the state where the recording medium 4 is attached to the drum 3, the starting end of the recording medium 4 is set as the recording start position when the recording operation is performed (recording operation ON state), and the recording medium The end of 4 is the recording end position. The drum 3 has a non-recording area which is an area between the recording end position and the recording start position and which is not covered by the recording medium 4. When the recording operation is OFF,
This non-recording area faces the condenser lens 5.
Then, when the recording operation is OFF, as shown in FIG.
A laser light is emitted to perform light quantity control including detection of the laser light quantity and correction of the light quantity (light quantity control ON state). Such control of the amount of laser light may be performed every one rotation of the drum 3, or may be performed every several rotations. Further, when the stability of the light amount is relatively high, it may be performed only before the start of recording on the recording medium 4.

As described above, in the present embodiment,
Since a part of the laser light emitted from the laser light source 2 is guided to the laser light detector 6 by the detection optical fiber 9, it is possible to guide the laser light to the laser light detector 6 with a simple configuration. The cost can be reduced.

Since the recording optical fiber 8 is provided, a part of the laser light emitted from the laser light source can be surely guided to the recording medium 4.

Further, since the recording optical fiber 8 is a so-called monofilament made of a single element wire, the laser light having a Gaussian light intensity distribution passes through the recording optical fiber 8 to produce a light intensity distribution. Can be changed to a uniform distribution, so that the light intensity distribution of the light with which the recording medium 4 is irradiated becomes uniform, whereby good recording can be performed on the recording medium 4.

Further, by controlling the light quantity, the fluctuation of the light quantity emitted from the laser light source 2 from the reference emitted light quantity can be suppressed, so that, for example, the fluctuation of the recording density and the deterioration of the line image can be prevented, which is excellent. Images and characters can be recorded on the recording medium 4.

A portion of the laser light emitted from the laser light source 2 having a low light intensity is incident on the detection optical fiber 9, and a laser light emitted from the laser light source 2 is incident on the recording optical fiber 8. When a portion having a high light intensity is incident on the recording medium 4, it is possible to irradiate the recording medium 4 with a light having a high light intensity and guide a light having a low light intensity that does not contribute to the recording to the laser light detector 6. As a result, the light for controlling the light amount can be guided to the laser light detector 6 without reducing the light amount for recording. Therefore, the light amount can be controlled without lowering the recording speed.

Further, the laser light source 2 in the optical fiber 7
Since the detection optical fiber 9 is arranged around the recording optical fiber 8 at one end opposite to, the high-intensity light of the laser light whose light intensity distribution is a Gaussian distribution is surely recorded. The light having a low light intensity can be made incident on the optical fiber 8 for detection, and the optical fiber 9 for detection can be surely obtained.
Since the light can be made incident on, it is possible to control the light amount without lowering the recording speed.

Next, FIG. 8 shows a first modified example of this embodiment.
It will be described based on. FIG. 8 is a side view showing the optical recording device 1 arranged so that the incident axis of the laser light on the recording surface of the recording medium 4 is oblique. As shown in FIG. 8, in this modification, the reflected light 15 emitted from the laser light source 2 and reflected by the recording medium 4 is prevented from returning to the optical path from the laser light source 2 to the recording medium 4 in the recording medium 4. The incident axis 16 of the laser beam with respect to the recording surface is set obliquely.
Specifically, the optical recording device 1 is arranged so that the incident axis 16 of the laser beam forms a slight angle α with respect to the perpendicular 17 of the surface of the drum 3 to which the recording medium 4 is attached. Note that the reflected light path that the reflected light 15 follows is not limited to the direction shown in FIG. 8, and may be, for example, toward the front and back of the paper surface, and is not limited to a particular direction.

With such a configuration, the laser light emitted from the laser light source 2 is obliquely applied to the recording surface of the recording medium 4, and the reflected light 1 reflected by the recording medium 4 is reflected.
5 does not return to the laser light source 2, the laser light source 2
It is possible to prevent the laser light source 2 from being destroyed by the reflected light 15 when the semiconductor laser is a semiconductor laser.

Next, FIG. 9 shows a second modification of the present embodiment.
It will be described based on. Here, FIG. 9 is a side view showing the optical recording device 1 provided with a collimating lens. In this modification, a collimator lens 18 is arranged between the laser light source 2 and the optical fiber 7.

With such a configuration, the laser light emitted from the laser light source 2 and diverging is collimated by the collimator lens 18 and incident on the recording and detection optical fibers 8 and 9, so that the laser light is emitted. The scattered and diverged laser light can be efficiently applied to the recording medium 4 and the laser light detector 6, and the recording speed can be increased.

Next, FIG. 1 shows a third modified example of the present embodiment.
It will be described with reference to FIGS. Here, FIG. 10 is a plan view schematically showing a state in which the plurality of optical recording devices 1 are arranged in one row, and FIG. 11 schematically shows a state in which the plurality of optical recording devices 1 are vertically arranged in two stages. A side view, FIG. 12 is a rear view schematically showing an example of a state in which a plurality of optical recording devices 1 are arranged in a plurality of upper and lower stages, and FIG. 13 is a state in which a plurality of optical recording devices 1 are arranged in a plurality of upper and lower stages. It is a rear view which shows another example schematically.

In this modification, a plurality of optical recording devices 1 each having a single unit are arranged. As the arrangement of the plurality of optical recording devices 1, as shown in FIG. 10, one-row arrangement in which the plurality of optical recording devices 1 are arranged in one row in the axial direction of the drum 3, and one-row arrangement as shown in FIG. Upper and lower two-stage arrangement in which two are arranged in the upper and lower sides, as shown in FIG. 12 and FIG.
A plurality of upper and lower columns can be exemplified as a column arrangement in which two or more columns are arranged vertically. As the upper and lower multi-stage arrangement, as shown in FIG. 12, staggered arrangement in which the stages are alternately shifted in both axial directions of the drum 3 from the upper stage to the lower stage, and the stages are arranged from the upper stage to the lower stage as shown in FIG. An arrangement in which the drum 3 is moved in one direction of the axial direction and the like can be mentioned. The number of stages of the optical recording device 1 may be set as needed.

With such a configuration, since a plurality of optical recording devices 1 are arranged, the recording speed can be increased as compared with the case of recording on the recording medium 4 with a single optical recording device 1. .

Next, FIG. 14 shows a second embodiment of the present invention.
It will be described based on. The same parts as those shown in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted (the same applies to the following embodiments).

Here, FIG. 14 is a vertical sectional front view showing the optical fiber of the present embodiment. The present embodiment is different from the first embodiment in the structure of the optical fiber 21. In the optical fiber 21 of the present embodiment, as shown in FIG. 14, the recording optical fiber 22 is composed of a plurality of element wires (so-called multifilament) instead of a single element wire.

With such a structure, it is possible to prevent the light intensity distribution of the laser light passing through the recording optical fiber 22 from changing as in the case of the monofilament. Such a recording optical fiber 22 is effective when it is not desired to change the intensity distribution of laser light.

Next, FIG. 15 shows a third embodiment of the present invention.
It will be described based on. Here, FIG. 115 is a vertical sectional front view showing the optical fiber of the present embodiment. The present embodiment is different from the first embodiment in the structure of the optical fiber 31. As shown in FIG. 15, the optical fiber 7 of the present embodiment includes a recording optical fiber 32 including a plurality of strands,
The detection optical fiber 33 is composed of a single wire. The detection optical fiber 33 is arranged at the lower end of the optical fiber 31 at one end facing the laser light source 2.

With such a structure, it is possible to prevent the light intensity distribution of the laser light passing through the recording optical fiber 32 from changing as in the case of the monofilament. Such a recording optical fiber 32 is effective when it is not desired to change the intensity distribution of laser light. Further, since the detection optical fiber 33 is a single strand, the detection optical fiber 33 and the recording optical fiber 32 can be easily bundled into one bundle.

Next, a fourth embodiment of the present embodiment will be described with reference to FIG. FIG. 16 is a vertical sectional front view showing the optical fiber of the present embodiment. The present embodiment is different from the first embodiment in the structure of the optical fiber 41. The optical fiber 7 of the present embodiment is composed of a recording optical fiber 42 composed of a plurality of strands and a detection optical fiber 43 composed of a plurality of strands. Then, of the laser light emitted from the laser light source 2, a part of the portion having a high light intensity is made incident on the detection optical fiber 43.
At one end of the optical fiber 41 facing the laser light source 2, a plurality of element wires of the detection optical fiber 43 are arranged near the center of the optical fiber 41.

With this structure, a portion of the laser light emitted from the laser light source 2 having a high light intensity is incident on the detection optical fiber 43.
A part of the high-intensity portion of the laser light emitted from the laser light detector 6 is guided to the laser light detector 6, and a sufficient amount of light is guided to the laser light detector 6 even when the amount of laser light emitted from the laser light source 2 is low. At the same time, most of the high-intensity portion of the laser light emitted from the laser light source 2 is applied to the recording medium 4, so the light amount control can be reliably performed with almost no decrease in recording speed.

In the above embodiment, the heat-sensitive color-developing type optical recording device 1 has been described. However, the optical recording device 1 is not limited to this, and for example, a master copy film is used as a recording medium. Optical recording device of the type that uses, electrophotographic optical recording device, CTP (Computer To Plating)
It may be an optical recording device of type e).

[0059]

According to the first aspect of the invention, in an optical recording apparatus for irradiating light from a light source to record on a recording medium, a photodetector for detecting light and a light emitted from the light source are detected. By including a detection optical fiber that guides at least a part of them to the photodetector, since at least a part of the light emitted from the light source is guided to the photodetector by the detection optical fiber, Light can be guided to the photodetector with a simple and inexpensive structure.

According to a second aspect of the present invention, in the optical recording apparatus according to the first aspect, the optical source for recording is provided with a recording optical fiber for guiding a part of the light emitted from the light source to the recording medium. It is possible to reliably guide a part of the light emitted from the recording medium to the recording medium by the recording optical fiber.

According to a third aspect of the present invention, in the optical recording apparatus according to the first or second aspect, the light amount for controlling the light amount of the light source so that the detection amount of the photodetector becomes a predetermined reference detection amount. By including the control means, it is possible to suppress fluctuations in the amount of light emitted from the light source, it is possible to prevent fluctuations in recording density and deterioration of line images, and to record good images, characters, etc. on a recording medium. be able to.

According to the invention described in claim 4,
In the optical recording device according to 2 or 3, the light emitted from the light source is so arranged that reflected light emitted from the light source and reflected by the recording medium does not return to an optical path from the light source to the recording medium. By obliquely irradiating the recording medium, the reflected light reflected by the recording medium does not return to the light source. Therefore, for example, when the light source is a semiconductor laser, it is prevented that the light source is destroyed by the reflected light. can do.

According to the invention of claim 5, claim 1,
The optical recording device according to 2, 3, or 4 further comprises a collimator lens disposed between the light source and the recording and detection optical fibers, so that the light emitted from the light source and diverged by the collimator lens. Since the light beams emitted from the light source are made parallel and incident on the recording and detecting optical fibers, the recording medium and the photodetector can be efficiently irradiated, and the recording speed can be increased.

According to the invention described in claim 6,
In the optical recording device of 3, 4, or 5, a portion of the light emitted from the light source having a high light intensity is incident on the recording optical fiber, and the detection optical fiber is emitted from the light source. When the light having a low light intensity is incident on the recording medium, the light having a high light intensity that contributes to recording can be applied to the recording medium, and the light having a low light intensity that does not contribute to recording can be guided to the photodetector. As a result, the light for controlling the light quantity can be guided to the photodetector without reducing the light quantity for recording, so that the light quantity can be controlled without lowering the recording speed.

According to the invention of claim 7, claim 2
In the optical recording device according to 3, 4, 5 or 6, the detection optical fiber is arranged around the recording optical fiber so that, for example, of the light whose light intensity distribution is a Gaussian distribution, Light with high light intensity can be reliably incident on the recording optical fiber, and light with low light intensity can be reliably incident on the detection optical fiber.
The light quantity can be controlled without lowering the recording speed.

According to the invention described in claim 8,
In the optical recording device of 2, 3, 4 or 5, a part of a portion of the light emitted from the light source having a high light intensity is incident on the detection optical fiber and is emitted from the light source. Since a part of the light having a high light intensity is guided to the photodetector, a sufficient amount of light is guided to the photodetector, and the control of the light amount can be reliably performed without substantially reducing the recording speed.

According to the invention of claim 9, claim 2
In the optical recording device according to 3, 4, 5, 6, 7 or 8,
The recording optical fiber is composed of a plurality of strands, and the detection optical fiber is composed of a single strand, so that the light intensity distribution of light passing through the recording optical fiber is prevented from changing. be able to. Such a recording optical fiber is effective when it is not desired to change the intensity distribution of laser light. Moreover, since the detection optical fiber is a single strand, the detection optical fiber and the recording optical fiber can be easily integrated.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an optical recording device according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a drum with a recording medium attached.

FIG. 3 is a vertical sectional front view showing an optical fiber.

FIG. 4 is a front view showing a relationship between an irradiation range of laser light and an optical fiber.

FIG. 5 is a schematic diagram showing a relationship between a light intensity distribution of laser light and an optical fiber.

FIG. 6 is a schematic diagram showing electrical connection of an optical recording device.

FIG. 7 is a schematic diagram showing the relationship between light amount control and recording operation.

FIG. 8 is a side view showing an optical recording device arranged such that an incident axis of laser light on a recording surface of a recording medium is oblique.

FIG. 9 is a side view showing an optical recording device provided with a collimator lens.

FIG. 10 is a plan view schematically showing a state in which a plurality of optical recording devices are arranged in one row.

FIG. 11 is a side view schematically showing a state in which a plurality of optical recording devices are vertically arranged in two stages.

FIG. 12 is a rear view schematically showing an example of a state in which a plurality of optical recording devices are arranged in a plurality of upper and lower stages.

FIG. 13 is a rear view schematically showing another example of a state in which a plurality of optical recording devices are arranged in a plurality of upper and lower stages.

FIG. 14 is a vertical sectional front view showing an optical fiber according to a second embodiment of the present invention.

FIG. 15 is a vertical cross-sectional front view showing an optical fiber according to a third embodiment of the present invention.

FIG. 16 is a vertical sectional front view showing an optical fiber according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 Optical recording device 2 light source (laser light source) 4 recording media 6 Photodetector (laser light detector) 8, 22, 32, 42 Recording optical fiber 9,33,43 Optical fiber for detection 15 Reflected light 18 Collimating lens

Claims (9)

[Claims] 1. An optical recording apparatus for irradiating light from a light source to record on a recording medium, and a photodetector for detecting light, and at least a part of the light emitted from the light source for the photodetector. And an optical fiber for detection that leads to the optical recording device. 2. The optical recording apparatus according to claim 1, further comprising a recording optical fiber that guides a part of the light emitted from the light source to the recording medium. 3. The optical recording apparatus according to claim 1, further comprising a light amount control means for correcting the light amount of the light source so that the detection amount of the photodetector becomes a predetermined reference detection amount. . 4. The light emitted from the light source is directed to the recording medium so that reflected light emitted from the light source and reflected by the recording medium does not return to an optical path from the light source to the recording medium. The optical recording device according to claim 1, wherein the optical recording device is obliquely irradiated. 5. The optical recording apparatus according to claim 1, further comprising a collimating lens arranged between the light source and the recording and detecting optical fibers. 6. A portion of the light emitted from the light source having a high light intensity is incident on the recording optical fiber, and a light intensity of the light emitted from the light source is incident on the detection optical fiber. 6. The optical recording device according to claim 2, 3, 4 or 5, wherein a portion having a low intensity is incident. 7. The optical recording apparatus according to claim 2, wherein the detection optical fiber is arranged around the recording optical fiber. 8. A part of a portion of the light emitted from the light source having a high light intensity is made incident on the detection optical fiber. Optical recording device. 9. The recording optical fiber comprises a plurality of strands, and the detection optical fiber comprises a single strand. 7. The optical recording device according to 7 or 8.