JP2007237694A - Optical recording head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical recording head which can form an image of a high resolution to a recording medium at a high speed even without an optical system being made large. <P>SOLUTION: A magazine 3 is set to a head body 1 moved in a sub scanning direction orthogonal to a main scanning direction to the recording medium moved in the main scanning direction. The magazine 3 has arrays of storage chambers 3a formed by multiple arrangement in the sub scanning direction and arranged in a plurality of stages in the main scanning direction. A laser recording means 2 of a pencil type comprised of both a semiconductor laser 12 installed in a cylindrical case 2a and the optical system which sheds a laser beams 12c ejected from the semiconductor laser onto the recording medium 7 is stored in the storage chamber. Also, adjustment of an optical axis of each laser recording means is carried out by rotating the laser recording means in the storage chamber. Variation of the optical axis due to fabrication errors of the magazine and fabrication errors of the laser recording means itself can be precisely adjusted in a short time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical recording head that can form a high-resolution image on a recording medium at high speed.

  2. Description of the Related Art In recent years, printing presses for printing printed materials such as newspapers include CTPs that create a printing original plate by converting digitized image data into highly directional light such as a laser beam and writing it directly onto a recording medium. (Computer to plate) technology is employed.

  In this CTP, a drum around which a sheet-like recording medium is wound is rotated to move the recording medium in the main scanning direction, and the optical recording head is moved in the sub-scanning direction orthogonal to the drum rotation direction (main scanning direction). An image is formed on the recording medium by moving and irradiating the recording medium with a laser beam from the optical recording head.

  In order to obtain high productivity without increasing the drum rotation speed with the CTP, it is necessary to increase the number of laser beams applied to the recording medium from the optical recording head. Various proposals have been made, and they have been put into practical use.

  For example, in Patent Document 1, a plurality of groove portions are formed on both surfaces, and the groove portions formed on one surface form a fixed block by stacking a plurality of substrates that are shifted with respect to the perpendicular of the other groove portion, and An optical recording head is described in which a terminal portion of an optical fiber is accommodated in a space region formed between opposing groove portions.

According to the optical recording head described in Patent Document 1, since the end portion of the optical fiber has a multi-layered matrix structure, many pixels can be recorded at one time and an optical system is used. Thus, when the light beam is expanded or contracted, the optical system can be reduced in size as compared with the case where the optical fiber terminal portions are arranged in a line.
JP 2000-153636 A

  However, the optical recording head described in Patent Document 1 has the following problems.

  When an ordinary optical recording head is used to record a high-resolution image on a recording medium, for example, 10 beams are set as one set, and four sets are combined to create 40 beams, and 40 beams are set as 1 set. The light is condensed on a recording medium by a single lens and an image is recorded on the recording medium. However, when a high-resolution image is recorded at a high speed, it is necessary to further increase the number of beams.

  For this reason, in the optical recording head described in Patent Document 1, for example, when forming the optical recording head by arranging 128 optical fibers, the optical system becomes large if they are arranged in parallel. By adopting a matrix configuration stacked on each other, the optical system is prevented from being enlarged.

  However, in recent CTP, a wider printing original plate is required to be put into practical use, and an attempt is made to record a high resolution image on a wide recording medium at a high speed by the optical recording head described in Patent Document 1. If the number of beams increases, a lens with a larger aperture must be used for the optical system, which increases the size of the optical system and increases the price. There is a problem that cannot be done.

  In addition, since the optical recording head becomes heavier when the optical system becomes larger, a drive system that moves the optical recording head in the sub-scanning direction is required, and the image forming apparatus is increased in size and consumed. There are also problems such as increased power.

  The present invention has been made to remedy such a problem, and an object thereof is to provide an optical recording head capable of forming a high-resolution image on a recording medium at a high speed without increasing the size of the optical system. Is.

  The optical recording head of the present invention is provided with a head body that is moved in a sub-scanning direction orthogonal to the main scanning direction with respect to a recording medium that is moved in the main scanning direction, and forms an image on the recording medium. An optical recording head comprising a plurality of laser recording means, and a magazine having a storage chamber in which a plurality of rows are arranged in the sub-scanning direction to form a row, and the rows are arranged in a plurality of stages in the main scanning direction. A pencil-type laser recording means comprising: a head main body; a semiconductor laser housed in a housing chamber and provided in a cylindrical case; and an optical system that irradiates a recording medium with a laser beam emitted from the semiconductor laser; The laser recording means is constituted by optical axis adjusting means for adjusting the optical axis of each laser recording means by rotating the laser recording means in the accommodation chamber.

  According to the optical recording head of the present invention, even when the number of laser recording means is increased in order to record a high resolution image at high speed, an optical system is provided for each laser recording means. This makes it possible to reduce the size of the optical system and significantly reduce the cost, and by rotating the laser recording means accommodated in the accommodation chamber, the production error of the magazine and the production of the laser recording means itself Variations in the optical axis due to errors can be adjusted accurately in a short time.

  An optical recording head according to a first aspect of the present invention is provided on a head body that is moved in a sub-scanning direction orthogonal to the main scanning direction with respect to a recording medium that is moved in the main scanning direction, and An optical recording head comprising a plurality of laser recording means for forming an image on a recording medium, and a storage chamber in which a plurality of rows are arranged in the sub-scanning direction to form a row, and the rows are arranged in a plurality of stages in the main scanning direction A pencil type comprising a head body provided with a magazine having a semiconductor laser, a semiconductor laser housed in a housing chamber and provided in a cylindrical case, and an optical system for irradiating a laser beam emitted from the semiconductor laser onto a recording medium The laser recording means and an optical axis adjusting means for adjusting the optical axis of each laser recording means by rotating the laser recording means in the housing chamber.

  With the above configuration, even when the number of laser recording means is increased in order to record a high-resolution image at high speed, an optical system is provided for each laser recording means, so there is no need to use a lens with a large aperture. As a result, the optical system can be miniaturized and the cost can be significantly reduced.

  Further, by rotating the laser recording means accommodated in the accommodation chamber, it becomes possible to accurately adjust the variation in the optical axis due to the manufacturing error of the magazine and the manufacturing error of the laser recording means itself in a short time.

  The optical recording head according to the second aspect of the present invention includes an optical axis adjusting means at the center of the case, a reference surface formed in the storage chamber, an urging means that presses the case of the laser recording means against the reference surface. On the other hand, it comprises laser recording means provided by decentering the optical axis of the semiconductor laser.

  With this configuration, an optical axis adjusting means capable of highly accurate adjustment can be obtained at low cost.

  In the optical recording head according to the third aspect of the present invention, the urging means is formed by a leaf spring accommodated in a concave groove formed in a corner portion of the accommodation chamber.

  With this configuration, the assembly work of the optical axis adjusting means is easy, and an inexpensive leaf spring is used, so that the cost of the optical axis adjusting means can be reduced.

  An optical recording head according to a fourth aspect of the present invention includes a laser beam irradiated to a recording medium from the laser recording means by accommodating the laser recording means in an accommodation chamber so that the movement of the recording medium can be adjusted in the contact / separation direction of the recording medium. This makes it possible to adjust the focus.

  With the above configuration, the focus adjustment of each laser recording unit can be easily performed by adjusting the movement of each laser recording unit in the direction of contact and separation of the recording medium according to the curvature of the recording medium. It can be formed easily.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a perspective view of a single optical recording head, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, FIG. 4 is an enlarged sectional view taken along line AA of FIG. FIG. 6 is an explanatory diagram showing the pixels formed by the laser recording means for each resolution, FIG. 7 is a block diagram of the control system, and FIGS. 8A to 8D are diagrams of the laser recording means. FIGS. 9A to 9D are explanatory views showing the assembly process of the laser recording means, FIGS. 10 and 11 are explanatory views when adjusting the optical axis of the laser recording means, FIGS. FIGS. 13A to 13C are explanatory views at the time of focus adjustment of the laser recording means, and FIG. 14 is a front view of a state in which a plurality of units are combined.

  The head body 1 of the optical recording head shown in FIG. 1 is used by being mounted on, for example, an image recording apparatus for producing a printing original plate, and has a magazine 3 provided with a large number of pencil type laser recording means 2.

  The magazine 3 is integrally formed with, for example, zinc die casting having a high thermal conductivity. The head body 1 is provided with cooling means 4 on the back side, and the laser control means 21 described later is mounted on the magazine 3. A printed circuit board 6 is attached.

  As shown in FIG. 3, the head body 1 is installed in the vicinity of the drum 8 around which the sheet-like recording medium 7 is wound, and the head main body 1 is moved relative to the recording medium 7 that is moved in the main scanning direction X as the drum 8 rotates. The drum 8 is moved in the main scanning direction by a main scanning driving means 9 such as a step motor, and the head body 1 is linearly moved. It is reciprocated in the sub-scanning direction Y by a sub-scan driving means 10 made of a motor or the like.

  In the magazine 3 of the head body 1, for example, 17 laser recording means 2 are arranged in a row L parallel to the sub-scanning direction Y as shown in FIG. A total of 85 (85 channels) laser recording means 2 are accommodated per unit of the head body 1.

  The storage chamber 3a of the magazine 3 in which each laser recording means 2 is stored penetrates the front and back surfaces of the magazine 3 in the horizontal direction and has a substantially square cross section as shown in FIG. For example, one vertical surface and a bottom surface perpendicular thereto are the reference surfaces 3b and 3c, and a concave groove 3d is formed in a corner located diagonally with a corner where the reference surfaces 3b and 3c intersect, A biasing means 11 made of, for example, a leaf spring, which presses the outer peripheral surface of the laser recording means 2 against the reference surfaces 3b and 3c is accommodated in the concave groove 3d.

  The pitch in the row L direction and the stepwise pitch (the pitches of each row L1 to L5) of the laser recording means 2 housed in each housing chamber 3a are, for example, 2400 dpi, 2540 dpi, and 2438.4 dpi high resolution images as recording media. 7 is set as follows so that the data can be recorded in the image data.

  In the optical recording head, in order to record a high-resolution image on the recording medium 7 at a high speed, the head body 1 is used by being connected to a plurality of units U1, U2,. The size of the head body is about 6 to 8 mm.

  Since it is difficult to arrange the 85 laser recording means 2 in a line in the magazine 3 having this size, in this embodiment, 17 lines per line are provided in 5 stages to form 85 channels. It has already been known from Patent Document 1 and the like that the recording time can be shortened by making the pitch of the laser recording means 2 as small as possible.

  The resolution of the image formed on the recording medium 7 by the laser recording means 2 is determined by the spot size of the laser beam 12c on the recording medium 7 and the feed speed in the sub-scanning direction Y.

  Therefore, in the past, every time the resolution is changed, the spot size is changed by an optical system such as a zoom lens and the feed speed in the sub-scanning direction Y is changed. However, this method requires an optical system such as a zoom lens. This is difficult to achieve with an optical recording head employing the pencil type laser recording means 2.

  Therefore, in the embodiment of the present invention, by devising the arrangement of the laser recording means 2, a multi-laser arrangement that enables recording at a plurality of resolutions, for example, 2400, 2540, 2438.4 dpi, only by controlling the sub-scanning direction Y. Is adopted.

  That is, in order to realize a plurality of resolutions without depending on the optical system, the laser recording means 2 that are originally required to be arranged in the least common multiple are arranged in integer multiples, and the errors are arranged in the least common multiple (see Table 1).

例えば解像度２４００ｄｐｉの画像を記録しようとした場合のレーザビーム１２ｃのビーム径は１０．５８μｍである。

For example, when recording an image with a resolution of 2400 dpi, the beam diameter of the laser beam 12c is 10.58 μm.

  When this is arranged in the row L direction and a straight line is to be drawn, it is necessary to arrange the laser recording means 2 at a pitch of 10.5 μ in the row L direction. In this case, the cases 2a of the laser recording means 2 interfere with each other. It is difficult to accommodate in the magazine 3.

  Therefore, in the embodiment, the laser recording means 2 arranged in each row L is shifted in the sub-scanning direction Y for each row L1 to L5 as shown in FIG.

  That is, if the laser recording means 2 at the end of L1 in the first row is channel ch1, channel CH2 is arranged in two rows L2, and the pitch between channel ch1 and channel ch2 is the inter-laser pitch (μm).

  Hereinafter, if the pitch between lasers is shifted from the channel ch3, the channel ch4, and the channel ch5 for each column L1 to L5, the channel ch6 is provided in the first column L1.

  As a result, the adjacent pitch (actual arrangement pitch) of the laser recording means 2 arranged in the first row L1 is almost six times that in the case where they are arranged in the same row, so that the cases 2a of the laser recording means 2 do not interfere with each other. Can be arranged in magazine 3.

  As a result of accommodating the laser recording means 2 in the accommodating chamber 3a of the magazine 3 as described above, each laser recording means 2 is arranged so that the pitch of the laser recording means 2 is obliquely shifted for each row L as shown in FIG. Thus, the pitch between the channels (inter-laser pitch) is about 10.58 μm when the resolution is 2400 dpi.

  Further, when the spot diameter of the laser beam on the surface of the recording medium 7 is made the same as the dot pitch (inter-laser pitch) at a resolution of 2400 dpi, recording is performed on a straight line without overlapping each other as shown in FIG. However, in the case of resolution 2540 dpi, the feed pitch in the sub-scanning direction Y is 10 μm, and in the case of 2438.4 dpi, the feed pitch in the sub-scanning direction Y is 10.8 μm, which is the same as when the resolution is 2400 dpi. In the spot diameter, adjacent dots are somewhat overlapped as shown in FIGS. 6A and 6B. However, since this overlap amount is 1 μm or less and is difficult to visually recognize, there is almost no problem in practical use.

  On the other hand, the laser recording means 2 accommodated in each accommodating chamber 3a of the magazine 3 has a cylindrical case 2a that can be accommodated in the accommodating chamber 3a, as shown in FIG.

  A semiconductor laser 12 is mounted on one end side of the case 2a so that the center (optical axis) O of the light emitting point 12a is decentered from the center O1 of the case 2a by an eccentric amount ε, and is a terminal protruding from the end surface of the case 2a. The laser control means 21 is electrically connected to 12b.

  In the case 2a, a partition wall 2b is formed at a position close to the semiconductor laser 12 side, and a collimator lens 13 is provided between the partition wall 2b and the semiconductor laser 12, and the collimator lens 13 is a support member 14. Is supported by the inner surface of the case 2a.

  The support member 14 is movable in the contact / separation direction of the semiconductor laser 12, and a tool 15 such as an eccentric driver is inserted through the adjustment hole 2 c formed in the outer peripheral surface of the case 2 a and the tool 15 is rotated. Thus, the parallelism of the laser beam 12b emitted from the semiconductor laser 12 can be adjusted, and the support member 14 is fixed to the case 2a by the adhesive 16 after the adjustment of the parallelism.

  A through hole 2d is formed in the partition wall 2b in the case 2a so as to coincide with the optical axis of the collimator lens 13, and a shaping lens 17 is fitted into the through hole 2d. It is fixed.

  An aperture 18 is provided on the surface of the partition wall 2b opposite to the collimator lens 13 side, the diameter of the laser beam 12c shaped by the shaping lens 17 is constant, and a laser beam is placed on the other end side of the case 2a. An objective lens 19 for condensing the beam 12c on the recording medium 3 is fitted and fixed to the end of the case 2a with an adhesive 16.

  On the other hand, the cooling means 4 provided on the back surface of the magazine 3 of the head body 1 is formed by, for example, three electric cooling fans 4 a per unit of the head body 1.

  As shown in FIG. 3, each cooling fan 4 a is accommodated in a casing 4 b attached to the back surface of the magazine 3, and blows air toward the rear of each laser recording means 2, thereby allowing the semiconductor laser 12 and the magazine 3 to be blown. The whole is air-cooled.

  The printed circuit board 6 mounted on the magazine 3 is equipped with laser control means 21 for controlling the semiconductor laser 12, and this laser control means 21 is connected to the control means 20 shown in FIG.

  The control unit 20 includes a main control unit 20a formed of a computer, a recording unit 20b, an image memory 20c, an operation unit 20d, and the like. The control unit 20 is also connected to the main scanning driving unit 9 and the sub-scanning driving unit 10, and controls them. It is like that.

  Next, the operation of the optical recording head constructed as described above will be described.

  In configuring the head main body 1, first, the pencil type laser recording means 2 used in the head main body 1 is assembled in the order shown in FIGS.

  First, as shown in FIG. 8A, the collimator lens 13 attached to the support member 14 is inserted from one end side of the case 2a as shown in FIG. 8A, and then shown in FIG. 8B. Thus, the semiconductor laser 12 is fitted.

  Thereafter, as shown in FIG. 8C, the tool 15 is inserted into the adjustment hole 2c of the case 2a, the support member 14 is moved in the contact / separation direction of the semiconductor laser 12, and the laser beam 12c emitted from the semiconductor laser 12 is obtained. After adjusting the parallel light so that becomes parallel light, as shown in FIG. 8D, the adjustment hole 2c is filled with the adhesive 16, and the collimator lens 13 is fixed at the adjustment position.

  Next, as shown in FIG. 9A, when the shaping lens 17 is inserted into the through hole 2d of the partition wall 2b from the other end side of the case 2a and fixed to the case 2a with the adhesive 16, the structure shown in FIG. As shown in FIG. 9, the aperture 18 is inserted from the other end side of the case 2a, and is fixed to the end face of the partition wall 2b as shown in FIG.

  Finally, as shown in FIG. 9D, the objective lens 19 is fitted to the other end of the case 2 a and fixed with the adhesive 16.

  For example, 85 pencil-type laser recording means 2 assembled as described above are manufactured per unit of the head body 1.

  Next, as shown in FIG. 4, the laser recording means 2 is inserted into each accommodating portion 3a of the magazine 3 formed in advance by zinc die casting, and the case 2a of the laser recording means 2 is accommodated by the urging means 11 accommodated in the concave groove 3d. Are brought into pressure contact with the two reference surfaces 3b and 3c of the accommodating portion 3a.

  In this state, as shown in FIG. 11, the center O of the reference surfaces 3b and 3c intersects with the optical axis center O1 of the semiconductor laser 12 that is previously decentered by the amount of eccentricity ε from the center of the case 2a. And when the head main body 1 is attached to the outer peripheral surface of the drum 8 so as to face each other as shown in FIG. 12, the vicinity of the center of the drum 8 and the laser recording means 2 that is shifted up and down from the center Since the shift amount S occurs at the focal position 12d, it is necessary to correct them.

  In adjusting the optical axis of the laser recording means 2, as shown in FIG. 10, a jig 2f connected to one end of the case 2a is held by a holding means 25 such as a chuck, and the laser recording means is attached to the magazine 3 with this upper body. Make 2 rotatable.

  Next, a drawing mask 26 having a large number of slits 26a as shown in FIG. 13 is prepared.

  A number of slits 26 a are formed in the drawing mask 26 in the same arrangement as the laser recording means 2 housed in the magazine 3 of the head main body 1, and this drawing mask 26 is provided between the laser recording means 2 and the light receiving sensor 27. As shown in FIG. 13A, the laser beam 12c is irradiated from the semiconductor laser 12 of the laser recording means 2 toward the light receiving sensor 27.

  The laser beam 12c emitted from the semiconductor laser 12 passes through the slit 26a of the drawing mask 26 and reaches the light receiving sensor 27. If the optical axis of the semiconductor laser 12 is deviated at this time, the laser beam 12c shown in FIG. As shown, the laser beam 12 c does not reach the light receiving sensor 27 blocked by the drawing mask 26.

  Therefore, when the laser recording means 2 is rotated by the gripping means 25, the spot 12e by the laser beam 12c moves as shown in FIG. 13B, and the laser beam 12c passing through the slit 26a reaches the light receiving sensor 27. become.

  As a result, since the output signal shown in FIG. 13C is output from the light receiving sensor 27, the laser recording means 2 is rotated to the position (spot position) where the output signal is the strongest to adjust the optical axis. .

  When the optical axis adjustment of the laser recording means 2 is completed, the head body 1 is actually mounted on an image forming apparatus (not shown) to perform focus adjustment. The image forming apparatus includes a plurality of units U1, U2 in the sub-scanning direction Y. ... Un connected to form an optical recording head.

  FIG. 14 shows a front view of an optical recording head in which a plurality of units U1, U2... Un are connected. The gap between the connecting portions of the magazines 3 provided in each head body 1 is about 0.5 mm. Yes.

  FIG. 12 shows the positional relationship between the head body 1 and the drum 8 mounted on the image forming apparatus. For example, the center of the laser recording means 2 in the third row L3 in the middle stage of the laser recording means 2 provided in five stages. When the focal point 12d of the laser beam 2c of the laser recording means 2 in the third row L3 is aligned with the surface of the recording medium 7 wound around the drum 8, the center line of the drum 8 is aligned with the center line of the drum 8 Deviation between the focal point 12d of the laser beam 12c of the laser recording means 2 in the fourth row L4 and the second row L2 positioned above and below the laser recording means 2 and the focal point 12d of the laser beam 12c of the laser recording means 2 in the third row L3. The amount S is 0.25 mm when the radius R of the drum 8 is 200 mm, and defocusing occurs between the laser recording means 2 in the third row L3 and the laser recording means 2 in the other rows.

  In order to correct this, the laser recording means 2 is moved in the contact / separation direction of the recording medium 8 so that each laser recording means 2 is focused on the recording medium 7 on the surface of the drum 8 so that the laser beam 12c is focused on 12d. Adjust the focus.

  When the focus adjustment of all the laser recording means 2 is completed, each laser recording means 2 is fixed to the magazine 3 by means such as adhesion so that the adjustment position does not shift.

  When the optical axis adjustment and the focus adjustment of each laser recording means 2 are completed, the semiconductor laser 12 of each laser recording means 2 and the printed circuit board 6 mounted on the magazine 3 are electrically connected, and then the back of the magazine 3 is connected. The cooling means 4 is attached to complete the incorporation of the optical recording head into the image forming apparatus. Next, the actual operation of the optical recording head will be described.

  A recording medium 7 on which an image is formed (recorded) by an optical recording head is mainly used as a printing original plate for printing a printed matter such as a newspaper. A sheet-shaped recording medium 7 in which a sublimation dye is applied to the surface of a base film. Is wound around the surface of the drum 8 and an image is formed on the recording medium 7 by the laser beam 12c.

  In forming an image on the recording medium 7, when the image resolution is input from the operation unit 20d and the operation is started, the drum 8 is driven by the main scanning drive unit 9 whose rotation is controlled by the main control unit 20a of the control unit 20. The head main body 1 rotated in the main scanning direction X at, for example, 300 rpm and composed of a plurality of units U1, U2... Un is sub-scanning direction by the sub-scanning driving means 10 whose feed rate is controlled by the main control means 20a. Reciprocated to Y.

  The semiconductor laser 12 generates a laser beam 2c corresponding to the image signal, and the laser beam 12c emitted from the semiconductor laser 12 becomes parallel light by the collimator lens 13 and reaches the shaping lens 17 and is shaped by the shaping lens 17. After that, the aperture 18 narrows the beam diameter to a constant diameter, reaches the objective lens 19, and is condensed on the surface of the recording medium 7 by the objective lens 19, and the image is recorded on the recording medium 7 based on the image data. Formed as follows.

  The sublimation dye applied to the surface of the recording medium 7 is separated from the recording medium 7 by the thermal energy of the laser beam 2c, and the discrete sublimation dye is sucked by suction means (not shown).

  Each time the drum 8 rotates once and the recording medium 7 is moved by one line in the main scanning direction X, the sub-scanning driving means 10 moves the head body 1 by a predetermined amount in the sub-scanning direction Y of the recording medium. By repeating the above and scanning the entire recording medium 7, an image is formed on the recording medium 7.

  An image formed on the recording medium 7 is distributed to each semiconductor laser 12 in the image memory 20c, and when recording on the recording medium 7, a laser beam is directed toward the recording medium 7 from the objective lens 19 side of the laser recording means 2. Although 2c is irradiated, it is controlled to always irradiate at the same position with respect to the main scanning direction X.

  That is, the next column L2 is irradiated with a delay for a preset time with respect to the column L1 to be recorded first, and the subsequent column L3 is also irradiated with a delay from the first columns L1 and L2 by the set time. However, the delay time may be adjusted once at an arbitrary resolution.

  A printing original plate is manufactured by forming an image on the entire recording medium 7 as described above, and a high-resolution image can be recorded at a high speed on a printing original plate having a large width. It becomes possible to improve the performance.

  The optical recording head of the present invention can form a high-resolution image on a recording medium at a high speed because a high-resolution image can be formed at a high speed on a wide printing original plate without increasing the size of the optical system. It is optimal for the optical recording head to be formed.

1 is a perspective view of an optical recording head according to an embodiment of the present invention. 1 is a front view of an optical recording head according to an embodiment of the present invention. Side view of an optical recording head according to an embodiment of the present invention FIG. 3 is an enlarged sectional view taken along line AA in FIG. Explanatory drawing which shows the arrangement | sequence of the laser recording means provided in the optical recording head which becomes embodiment of this invention Explanatory drawing of the pixel formed by the laser recording means provided in the optical recording head which becomes embodiment of this invention 1 is a block diagram of a control system for controlling an optical recording head according to an embodiment of the present invention. Explanatory drawing which shows the assembly process of the laser recording means provided in the optical recording head which becomes embodiment of this invention Explanatory drawing which shows the assembly process of the laser recording means provided in the optical recording head which becomes embodiment of this invention Explanatory drawing at the time of optical axis adjustment of the laser recording means provided in the optical recording head according to the embodiment of the present invention Explanatory drawing at the time of optical axis adjustment of the laser recording means provided in the optical recording head according to the embodiment of the present invention Explanatory drawing at the time of focus adjustment of the laser recording means provided in the optical recording head according to the embodiment of the present invention Explanatory drawing at the time of focus adjustment of the laser recording means provided in the optical recording head according to the embodiment of the present invention The front view of the state which arranged the optical recording head which becomes embodiment of this invention in multiple numbers

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head main body 2 Laser recording means 2a Case 3 Magazine 3a Storage chamber 3b Reference surface 3c Reference surface 3d Concave groove 7 Recording medium 9 Main scanning means 10 Sub-scanning means 11 Energizing means 12 Semiconductor laser 12c Laser beam 13 Collimator lens 17 Shaping lens 19 Objective lens 20 Control means 21 Laser control means X Main scanning direction Y Sub-scanning direction

Claims (4)

A head main body moved in a sub-scanning direction orthogonal to the main scanning direction with respect to a recording medium moved in the main scanning direction, and a plurality of laser recordings provided on the head main body and forming an image on the recording medium A plurality of optical recording heads arranged in the sub-scanning direction to form a column, and a magazine having a storage chamber in which the column is arranged in a plurality of stages in the main scanning direction. A pencil-type laser recording means comprising a main body, a semiconductor laser housed in the housing chamber and provided in a cylindrical case, and an optical system for irradiating the recording medium with a laser beam emitted from the semiconductor laser; An optical recording head comprising: an optical axis adjusting unit that adjusts an optical axis of each laser recording unit by rotating the laser recording unit in the housing chamber. The optical axis adjusting means includes a reference surface formed in the housing chamber, an urging means for pressing the case of the laser recording means against the reference surface, and an optical axis of the semiconductor laser with respect to the center of the case. 2. The optical recording head according to claim 1, wherein the optical recording head is constituted by the laser recording means provided eccentrically. 3. The optical recording head according to claim 1, wherein the urging means is formed by a leaf spring accommodated in a concave groove formed in a corner portion of the accommodation chamber. The laser recording means is accommodated in the accommodation chamber so as to be movable and adjustable in the contact / separation direction of the recording medium, thereby making it possible to adjust the focus of the laser beam irradiated to the recording medium from the laser recording means. Item 4. The optical recording head according to any one of Items 1 to 3.

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