JP4662016B2 - Light source device manufacturing equipment - Google Patents

Description

The present invention relates to a light source device manufacturing apparatus , and more particularly, to a light source device manufacturing apparatus with improved positional accuracy between a light source and an optical element.

  In a light source device provided with a light source, the directivity of laser light emitted from the light source device, the parallelism of light beams, and the like are required as optical characteristics. For this reason, when manufacturing a light source device, it is necessary to position the relative position of the light emitting point of a light emitting element, and a lens with high precision.

  Conventional techniques aimed at increasing the accuracy of the relative position between the light emitting element and the lens include “light source unit” disclosed in Patent Document 1, “light source device” disclosed in Patent Document 2, and Patent Document 3. The disclosed “light source device” can be mentioned.

  An object of the invention disclosed in Patent Document 1 is to facilitate adjustment of the position of an optical system of a light source unit for multi-beam radiation. The invention disclosed in Patent Document 1 is an optical system jig provided with an attachment portion for fixing a laser diode and an optical system, and a bar body having a groove therebetween, and having an opening in contact with the optical system from the groove side or the opposite side. Is provided on the bar body. Then, the control means moves the optical system jig along the optical axis in the optical system drive system based on the output of the beam focal position detection means for detecting the focal position of the beam emitted from the optical system. Based on the output of the beam direction detecting means for detecting the beam direction, the LD jig for holding the laser diode by the LD driving means is moved along a plane perpendicular to the optical axis.

  Further, the invention disclosed in Patent Document 2 aims to reduce energy loss when the lens barrel is assembled using an ultraviolet curable adhesive. In the invention disclosed in Patent Document 2, an ultraviolet curable adhesive is interposed between a cylindrical portion of a laser holder that holds a semiconductor laser and a protruding portion of a transparent lens barrel that is integrally formed with a collimator lens. The ultraviolet curable adhesive is cured by the ultraviolet rays irradiated from the ultraviolet irradiator. The surface of the protruding portion of the lens barrel is raised in a convex shape and functions as a lens that collects ultraviolet rays.

In addition, the invention disclosed in Patent Document 3 has a small number of components, and there is no risk of misalignment during assembly, and the collimator lens can be bonded using a photo-curing adhesive. An object of the present invention is to provide a highly accurate light source device. The invention disclosed in Patent Document 3 includes a base having a fitting hole penetrating the front and back, a semiconductor laser located on the back side of the base and fitted in the fitting hole, and a front surface of the fitting hole. A collimator lens positioned in front and held coaxially with the optical axis of the semiconductor laser, and an aperture forming member for shaping the laser light emitted from the collimator lens, having a diameter slightly smaller than the outer circumference of the collimator lens A lens support portion having a large arc-shaped cross section is positioned on the front surface of the fitting hole so as to be concentric with the optical axis of the semiconductor laser, and is integrally formed with the base. Used for adhesive fixing.
Japanese Patent Laid-Open No. 5-113545 JP 7-325241 A JP-A-9-246657

  However, in the invention disclosed in Patent Document 1, the semiconductor laser and the lens are separately held, and the adjustment of the focal direction, that is, the optical axis direction is performed by adjusting the lens position, and the beam position, that is, the optical axis is perpendicular The position adjustment in the plane formed is performed by adjusting the position of the semiconductor laser. In this method, since the semiconductor laser and the lens are separately held, there is a problem that the structure of the substrate for holding becomes complicated and the cost is increased. However, as a bonding method after positioning, a YAG laser is used. Therefore, there is a concern that the semiconductor laser and the lens may be displaced due to residual stress after bonding. Further, no consideration is given to the method of holding the semiconductor laser or lens of the position adjusting mechanism with respect to the problem that the relative position between the light emitting point of the semiconductor and the lens needs to be obtained with high accuracy.

In the invention disclosed in Patent Document 2, the positional relationship between the semiconductor laser and the lens is not adjusted with respect to the two axes in the direction perpendicular to the optical axis direction. I am going out. Then, after adjusting the focus in the optical axis direction, the positional relationship between the two is fixed using an ultraviolet curable adhesive. UV curable adhesives are advantageous for shortening the production tact and are excellent in reliability, so they are often used for lens bonding.
However, in recent years, an apparatus for recording information on the surface of a recording medium (an image recording apparatus on the surface of a photoreceptor) has been improved in resolution (high density recording) and increased in accuracy, and is often used in a recording apparatus. The optical recording light source device is also required to have high accuracy, and a positional accuracy of less than a micron is required. Therefore, there is a limit to positioning by mechanical fitting, and it is necessary to adjust the relative position of the light emitting point of the semiconductor laser and the lens in the three-axis (x, y, z) directions. In other words, in the light source device having the semiconductor laser and the lens, the structure must be able to be adjusted in the three-axis direction and fixed at the adjusted position, but the invention disclosed in Patent Document 2 is like this It is not a proper structure.

  The invention disclosed in Patent Document 3 is based on the problems in the invention disclosed in each of the above-mentioned Patent Documents. When the lens is fixed with an adhesive, the adhesive shrinks during curing. Therefore, it is ideal to minimize the influence of the shrinkage on the optical characteristics. Particularly in the light source device, since the required accuracy in the z direction (optical axis direction) is high, the shrinkage direction of the adhesive is configured not to coincide with the optical axis direction. Accordingly, in the x and y directions (two directions orthogonal to the optical axis), positional displacement after bonding due to shrinkage occurs. However, in order to ensure the positional accuracy after bonding, a certain amount of shrinkage is expected to be initial. It is common to offset the position. However, if the amount of shrinkage is not fixed, it is difficult to give an offset, and therefore the shrinkage direction of the adhesive is limited to one direction so that the shrinkage direction is only one of the x and y directions.

  By the way, in order to improve the accuracy of the relative position between the light emitting element and the lens, the lens must be chucked so as not to move even during bonding. Although the invention disclosed in Patent Document 3 has not been described in detail with respect to the chuck mechanism, when the lens is completely fixed by a general chuck means, the lens and the lens are contracted by the shrinkage of the adhesive after the completion of the bonding. Stress occurs between the lens support part and the lens support part. In the invention disclosed in Patent Document 3, this facilitates peeling of the adhesive. Further, when the chuck mechanism is released, a rapid reaction occurs in the lens, which causes a problem that the positional accuracy of the lens is easily lost. For this reason, when the chuck mechanism is movably provided, it is necessary to set conditions so that the lens positioning accuracy is not impaired.

  Thus, conventionally, when manufacturing the light source device, the relative position between the light emitting element and the lens could not be determined with high accuracy.

The present invention has been made in view of such problems, and an object thereof is to provide a manufacturing equipment of the light source device capable of determining the relative positions of the light emitting element and the lens with high accuracy.

In order to achieve the above object, the present invention provides, as a first aspect, a light emitting element, a base on which at least one light emitting element is disposed, and at least one lens disposed coaxially with the optical axis of the light emitting element. An apparatus for manufacturing a light source device having a lens support member to which a lens is bonded and fixed, wherein the adhesive that bonds and fixes the lens has a property of shrinking when cured, and an arm unit that holds the lens, and the arm unit the consists of arm unit holding means for movably holding only in the vertical direction, the lens and the chuck means for clamping the lens to be fixed to the lens support member disposed vertically below of the lens, from the light emitting element And a monitor installed so that light from the optical axis in the horizontal direction enters through the lens, and the arm unit holding means is connected to the arm unit. A pressurizing unit that applies pressure in a direction away from the lens support unit, and a stopper that regulates the position so that the arm unit is not further than a predetermined distance from the lens support unit. The pressure to be applied provides a light source device manufacturing apparatus characterized in that the pressure is weaker as the distance between the arm unit and the lens support portion is narrower. With such a configuration, the accuracy of the assembly is increased and the variation is reduced, and the tilt of the lens during the assembly can be prevented. This makes it possible to provide a method for manufacturing a light source device with high assembly strength with an inexpensive configuration.

Also, with such a configuration, when the lens is bonded to the lens support portion, the moving direction of the lens is only vertically downward , so that the positional accuracy of the lens is improved. In addition to this, since the lens can be stably chucked, the arm unit can stably follow the moving lens by the contraction of the adhesive. In addition, since the lens can be stably chucked, the stress acting on the lens during bonding can be reduced.

In addition, it is possible to reduce variations in lens position due to gravity and stress on the bonding surface during lens bonding.

In any of the above-described configurations of the first aspect of the present invention, the chuck means includes a position in each axial direction of the three-dimensional orthogonal coordinate system in which the optical axis direction of the lens is one axial direction, and the optical axis of the lens. It is preferable that the rotation angle around two coordinate axes that do not coincide with the direction can be adjusted. In this way, the position of the lens with respect to the light emitting element can be adjusted in three axial directions and two rotational directions.
Alternatively, the base is centered on two coordinate axes that do not coincide with the optical axis direction of the lens and the position in each axial direction of the three-dimensional orthogonal coordinate system with the optical axis direction of the lens as one axial direction with respect to the chuck means. It is preferable that the rotation angle can be adjusted. In this way, the position of the lens with respect to the light emitting element can be adjusted in three axial directions and two rotational directions.

In the first aspect of the present invention, it is preferable that the adhesive for adhering and fixing the lens to the lens support portion is an ultraviolet curable adhesive , and the arm unit is transparent. By using an ultraviolet curable adhesive, the timing of curing of the adhesive can be freely controlled, and the residual stress after bonding can be reduced. Furthermore, since the lens positioning and curing time distribution can be arbitrarily set in the bonding process, the assembling accuracy can be further improved. In addition to this, it is more preferable to cure the ultraviolet curable adhesive by irradiating ultraviolet rays substantially symmetrically with respect to the vertical plane including the optical axis of the lens. By irradiating ultraviolet rays in this way, the shrinkage direction of the adhesive is limited, and the calculation of the offset amount of the initial position of the lens and the configuration of the chuck means can be facilitated.

According to the present invention can provide a manufacturing equipment of the light source device capable of determining the relative positions of the light emitting element and the lens with high accuracy.

Embodiments in which the present invention is suitably implemented will be described. 1 and 2 show the configuration of the light source device according to the present embodiment.
The light emitting element 1 is held by the base 2 so that the optical axis direction thereof is the horizontal direction. As the light emitting element 1, various types such as an LED and an incandescent lamp can be applied, but a semiconductor laser is generally used as a light source of a recording apparatus.
Since it is preferable that the base 2 and the light emitting element 1 are accurately positioned and fixed, a fitting hole is provided in the base 2, and the light emitting element 1 is accurately fitted along the fitting hole. The structure is applied.

A lens 3 is disposed on the extension of the optical path of the light emitting element 1. As the lens 3, a collimator lens or a condensing lens is often applied. When collimation of light beams is required, a collimator lens is used, and when the light is condensed and used as a minute spot, a condensing lens is used. FIG. 1 illustrates a configuration using a monocular condenser lens.
In addition, you may use the lens which has the effect of the condensing lens, the collimator lens, and the effect by one sheet. With such a configuration, the effects of both the parallelism of the laser light beam and the formation of the minute spot can be obtained with a simple lens adhesion configuration. Of course, the collimator lens and the condenser lens may be provided separately, or a lens group in which a plurality of condenser lenses are combined may be used. In that case, the lens group may be integrated into a single lens barrel to form a unit.

The lens 3 must be fixed after being accurately aligned with the optical axis of the light emitting element 1. Therefore, the lens 3 is bonded to the lens support portion 2a with an adhesive 4 typified by an ultraviolet curable adhesive.
The ultraviolet curable adhesive is an adhesive that is cured by irradiating with ultraviolet rays. When this adhesive is used, the adhesive is cured by irradiating with ultraviolet rays in the bonding step. In the present invention, an adhesive such as an instantaneous adhesive, an epoxy adhesive, and a bond can be applied, and the present invention is not limited to a special adhesive. It is also possible to fix the lens 3 to the lens support 2a by welding.
However, since the ultraviolet curable adhesive is most excellent in handleability, it is most preferable to use it for the present invention.

  The lens support portion 2 a is provided with a clearance with respect to the theoretically correct position of the lens 3. This clearance is an adjustment margin for adjusting the position of the lens 3 and also a space for injecting the adhesive 4. Therefore, if the clearance is too small, a sufficient adjustment margin cannot be ensured. Conversely, if the clearance is too large, the layer of the adhesive 4 becomes thick and the shrinkage amount increases, so an appropriate value is set. If an ultraviolet curable adhesive is used as the adhesive 4, the clearance is preferably set to about 0.1 to 0.3 mm.

The position adjustment of the lens 3 is performed using a chuck means 5 for chucking the lens 3 and a monitor 6. FIG. 2 shows an example of the configuration of the chuck means 5. The lens 3 is held by the chuck means 5 before bonding, and the chuck means 5 and the base 2 can be adjusted in relative positions in the three axial directions of x, y, and z. Furthermore, the remaining two rotation directions other than the rotation direction around the optical axis of the lens 3 can be adjusted. That is, as shown in FIG. 3, the chuck means 5 is provided with a position adjusting mechanism having five degrees of freedom.
Then, the monitor 6 is installed so that the light emitting element 1 emits light and the light passes through the lens 3 and reaches the monitor 6. The monitor 6 is a monitor that can monitor the position of the beam and the shape of the beam spot. Therefore, the lens position can be accurately determined by adjusting the position of the lens 3 while observing on the monitor 6 so that the beam position and the shape of the beam spot (that is, the adjustment of the focal position) are optimal. Yes. It is more preferable that a control system that automatically adjusts the position of the lens 3 by performing image processing on the shape of the beam spot reflected on the monitor 6 is provided.

After the lens 3 is accurately positioned, the adhesive 4 is injected to adhere the lens 3. As described above, an ultraviolet curable adhesive is most preferable as an adhesive applied to the present invention because it has excellent handleability.
For example, in the case of an instantaneous adhesive, since the injected adhesive is hardened immediately, it is difficult to uniformly inject around the lens 3, and there is also a concern about residual stress after bonding. . Also, the epoxy adhesive requires at least one hour to cure (generally 24 hours), and the chuck means 5 cannot be moved until the adhesive 4 is cured, resulting in a slow working speed. End up. Bond-based adhesives also take time to cure, and there are concerns about adhesive strength and elasticity after bonding. In addition, for welding, the metal and plastic must be heated to dissolve locally. For this reason, in the case of welding, there are concerns about the generation of thermal stress and thermal expansion / contraction.
On the other hand, since the ultraviolet curable adhesive does not cure unless it is irradiated with ultraviolet rays, the adhesive injected before the lens position adjustment is not cured and spreads uniformly around the lens. Therefore, the position adjustment of the lens 3 can be performed over time. Further, if the ultraviolet ray is irradiated after the position of the lens 3 is determined, the lens 3 is quickly cured, so that the time required for the bonding process can be efficiently shortened. At this time, since the adhesive is evenly distributed around the lens 3, stress is not unevenly generated when the adhesive is cured.

As a method of injecting the adhesive 4 into the clearance between the lens 3 and the lens support portion 2a, a method of injecting the nozzle 7 close to the clearance is generally used. In the case of applying this method, if a mechanism for always keeping the amount of the adhesive 4 discharged from the tip of the nozzle 7 at a constant amount is provided, adhesion variation between lots can be reduced.
Note that the adhesive 4 can be injected into the clearance between the lens 3 and the lens support portion 2a by another method as long as it is an ultraviolet curable adhesive that does not cure unless irradiated with ultraviolet rays. For example, the adhesive 4 is held at the tip of a needle-like member, and it is brought into contact with the clearance between the lens 3 and the lens support 2a to inject by capillary action, or previously adhered to the lens 3 or the lens support 2a. A method of applying the agent 4 is also applicable.

If the adhesive agent 4 is inject | poured between the lens 3 and the lens support part 2a, this will be hardened.
In the case of an ultraviolet curable adhesive, the adhesive is cured by irradiating with ultraviolet rays. However, since it can be cured after the position of the lens 3 is accurately positioned, it is possible to perform time-effective adhesion.

  In the case of UV curable adhesives, UV light can be irradiated from any direction as long as the adhesive can be irradiated evenly. However, energy efficiency is better when the UV light is irradiated locally using an optical fiber or the like. Besides being good, the curing time can be shortened. Furthermore, when an optical fiber is used, it is possible to easily guide ultraviolet rays to complicated places.

  When the object to be bonded is a single lens, the lens itself is transparent, and therefore, as shown in FIG. It is preferable to irradiate ultraviolet rays as close to the adhesive 4 as possible.

  When a lens array unitized by a lens barrel is bonded, an optical path of ultraviolet rays is secured by making a hole in the lens barrel or making the lens barrel transparent.

  If the arm unit 51 is transparent, the direction in which the adhesive 4 can be irradiated with ultraviolet rays and the layout of the arm unit 51 are not limited.

  The lens 3 is bonded and fixed at an accurate position by the above process, but the adhesive 4 has a feature that it shrinks at the time of curing regardless of the type. For this reason, the problem that the position of the lens 3 changes little by little due to the shrinkage of the adhesive 4 occurs in the bonding process. For example, when the lens 3 is completely fixed by the chuck means 5, the bonding process is started after the lens 3 is guided to a predetermined position. However, after the bonding is completed, the lens 3 and the lens support section are contracted by the shrinkage of the adhesive 4. Stress occurs between 2a. When stress is generated in this manner, the adhesive 4 is easily peeled off. Furthermore, as shown in FIG. 5, when the chuck means 5 is released, a sudden reaction occurs in the lens 3, and the positional accuracy of the lens 3 is impaired.

  In the present embodiment, the configuration of the chuck means 5 is configured as follows in order to prevent the above problem from occurring.

  The chuck means 5 includes two units, an arm unit 51 that holds the lens 3 and an arm unit holding means 52 that holds the arm unit 51.

The arm unit 51 includes an arm 51a and an arm 51b. The arm 51b is rotatably attached to the arm 51a and is biased by the biasing spring 51d, so that the lens 3 can be securely sandwiched.
The portion of the arm 51a that supports the lens 3 is a flat surface, and the portion of the arm 51b that supports the lens 3 is provided with a notch as shown in FIG. Supported by the ridgeline. For this reason, the lens 3 can be securely fixed and supported by the arm unit 51.

  Note that the shape of the portion of the arm 51b that contacts the lens 3 is not limited to the shape that contacts the lens 3 by two ridge lines. For example, as shown in FIG. 6B, the optical axis of the lens 3 The lens 3 may be supported by one ridge line formed in the direction and one point not on the ridge line, or as shown in FIG. 6C, the lens is formed by three points that are not in the same straight line. 3 may be supported. In any case, the lens 3 can be chucked at a predetermined position with a good posture, but the shape that supports the lens 3 with two ridge lines can support the lens 3 with the best posture. In addition, it cannot be overemphasized that the part which is catching the lens 3 at this time must not overlap with the part to which the lens 3 is adhere | attached.

  In the configuration shown in FIG. 2, the surface of the arm 51a that supports the lens 3 is provided with a slight gradient with respect to the vertical direction. Therefore, when the lens 3 is released from the chuck means 5 after the lens is bonded, the chuck means 5 can be easily retracted without applying stress to the lens 3 by simply retracting the arm 51b and then lifting it in the vertical direction. .

The arm unit holding means 52 holds the arm unit 51 movably in the vertical direction. The arm unit 51 is provided with a long hole 51 c, and the arm unit holding means 52 is provided with two sliding bearings 52 d, so that the arm unit 51 does not tilt with respect to the arm unit holding means 52. Move in one direction only.
The positional relationship between the long hole 51c and the slide bearing 52d may be reversed (that is, the slide bearing is provided in the arm unit 51 and the long hole is provided in the arm unit holding means 52). At this time, it is preferable to set the long hole 51c and the slide bearing 52d so that there is no backlash. However, since the play is unavoidable simply by fitting, it is general that the play is removed using the leaf spring 52e or the like.

  The upward movement of the arm unit 51, that is, the movement of the lens 3 in the direction away from the lens support portion 2a is restricted by the stopper 52c. On the other hand, the downward movement of the arm unit 51 is limited by being pressurized upward by the magnet 52b. Needless to say, if a downward force equal to or greater than the applied pressure is applied to the arm unit 51, the arm unit 51 moves downward.

  Next, the operation of the chuck means 5 will be described with reference to FIG. (A) shows a state before the adhesive 4 is cured, and (b) shows a state after the adhesive 4 is cured. Since the adhesive 4 shrinks during curing, the lens 3 moves downward in the figure. In the initial state of lens adhesion, the arm unit 51 is pressed against the stopper 52c by the force of the magnet 52b. As the adhesive 4 hardens, the arm unit 51 moves in a direction away from the stopper 52c according to the slide bearing 52d against the force of the magnet 52b. At this time, since the gap of the magnet 52 becomes large, the applied pressure acting on the arm unit 51 becomes weak as the arm unit 51 moves.

What is important at this time is that the initial force of the magnet 52b should be set smaller than the adhesive force when the adhesive 4 contracts and sufficiently large with respect to the gravity acting on the arm unit 51. This means that the lens holding force of the arm unit 51 must be sufficiently larger than the force of the magnet 52b.
If the force of the magnet 52b is larger than the adhesive force, the same problem as the phenomenon shown in FIG. 5 occurs. When the force of the magnet 52b is smaller than the gravity acting on the arm unit 51, the arm unit 51 falls and the lens 3 cannot be held. Further, when the lens holding force of the arm unit 51 is weak with respect to the force of the magnet 52b, when the adhesive 4 is cured and the lens 3 moves, the arm unit 51 itself does not move downward and only the lens 3 moves. It moves and the relative position of the lens 3 shifts.
By appropriately setting the force of the magnet 52b, the moving direction of the lens 3 can be restricted only downward.

In the bonding process, the lens 3 moves downward as the adhesive 4 contracts. At this time, the gap between the magnets 52b is opened, and as a result, the pressure applied to the magnets 52b decreases. .
This is because the magnetic force of the magnet 52b depends on the distance between the two poles and is inversely proportional to the square of the distance between the two poles as shown in FIG. Therefore, the pressure applied to the magnet 52b is the smallest when the adhesive 4 is completely contracted and the bonding is completed. Most preferably, the applied pressure at this time is balanced with or slightly larger than the gravity acting on the arm unit 51. When the applied pressure is increased, a strong stress may be applied to the lens 3. In this case, when the chuck means 5 is released, a rapid reaction occurs in the lens 3 and the position accuracy is impaired. Conversely, if the applied pressure is too small, the same problem may occur due to the gravity acting on the arm unit 51.

Let us consider a case where the pressure applied to the arm unit 51 is applied by an elastic member (for example, a spring). The elastic force generated when the elastic member is displaced (deformed) becomes stronger as the displacement increases. Therefore, when an applied pressure is applied to the arm unit 51 using an elastic member, the applied pressure becomes the largest when the lens 3 is moved downward and in a bonded state.
On the other hand, the magnet 52b is suitable as a pressure urging means to be applied to the chuck means 5 of the present invention because the pressure decreases as the moving amount of the lens 3 increases, contrary to the elastic member. By using the magnet 52b as the pressure urging means, the lens 3 can be bonded with high accuracy.

Since the movement of the lens 3 due to the shrinkage of the adhesive 4 is an unavoidable problem, how to limit the moving direction of the lens 3 so as not to impair the adhesive strength is the biggest problem. In order to secure the positional accuracy of the lens 3 after bonding, the initial position of the lens 3 must be offset in anticipation of the contraction amount, but it is not preferable to make the parameters for obtaining the offset amount complicated. For this reason, it is necessary to limit as much as possible the direction in which the lens 3 moves when the adhesive 4 is cured.
In the illustrated example, when the adhesive 4 contracts, the lens 3 moves downward. However, the lens 3 does not necessarily move vertically downward, and can be slightly shifted from side to side due to the influence of the density distribution of the adhesive 4 and disturbance. There is sex. However, in the present invention, by adopting such a configuration, the horizontal direction component is excluded from the moving direction of the lens 3 and the moving direction is limited to the vertical direction. Since the moving amount at this time has a certain degree of reproducibility, the lens 3 can be adhered with high accuracy by estimating the moving amount in advance and adjusting the position using this as an offset amount.

  At this time, it is needless to say that the approximate direction in which the adhesive 4 contracts and the movable direction of the lens in the chuck means 5 must be matched, otherwise the stress generated after the bonding becomes large. Accordingly, the moving direction of the lens 3 may not be the vertical direction as long as the approximate direction in which the adhesive 4 contracts coincides with the movable direction of the lens 3 in the chuck means 5. However, if the moving direction of the lens 3 is set to the vertical direction, the influence of gravity is eliminated and the lens 3 can be bonded without causing stress. Further, the light emitting element 1 is held by the base 2 so that the optical axis direction thereof is the horizontal direction. As a result, the optical axis of the lens 3 is also set in the horizontal direction. Can prevent the inclination of the lens 3 from changing.

The representative form of the chuck means 5 is as described above, but other structures are possible.
FIG. 9 shows an example of the structure of the chuck means 5. The chuck means 5 shown in FIG. 9 has a configuration in which a combination of a roller 52g pressed by a spring 52h and a guide surface 51f is used instead of the combination of the long hole 51c and the slide bearing 52d. By using the same material as that used for the sliding bearing for the guide surface 51f, it is possible to reduce the friction and move the arm unit 51 smoothly. Further, as shown in FIG. 10, a roller may be attached to the guide surface 51f.

  Furthermore, as shown in FIG. 11, the chuck means 5 may be configured using a guide shaft 52j and a bearing 52k. Here, a roller 52g provided with a spring 52h is provided for the purpose of regulating the position in the rotational direction and removing play.

The shape of the lens support portion 2a will be described.
The adhesion surface of the lens support portion 2 a is substantially bilaterally symmetrical with respect to a plane formed by a vertical line passing through the center of the lens 3 and the optical axis of the lens 3. As the most general shape, an arc shape having a slightly larger diameter than the outer peripheral circle of the lens 3 as shown in FIG. 1 can be given.
However, the shape shown in FIG. 12 and FIG. 13 may be used as long as the condition of substantially bilateral symmetry with respect to the plane formed by the vertical line passing through the center of the lens 3 and the optical axis of the lens 3 is satisfied.

In general, since the amount of movement of the lens 3 due to the shrinkage of the adhesive 4 is proportional to the thickness of the adhesive layer, the plane formed by the vertical line passing through the center of the lens 3 and the optical axis of the lens 3 forms the adhesive surface. , The contraction of the adhesive 4 cancels out in the horizontal direction out of the two directions orthogonal to the optical axis. Therefore, as shown in FIG. 14, the movement amount of the lens 3 is zero as a whole. Close to. Therefore, the moving direction of the lens 3 due to the shrinkage of the adhesive 4 is only the vertical direction of the two directions orthogonal to the optical axis.
As a practical matter, the lens 3 is slightly displaced in the horizontal direction even in the above configuration due to the distribution of the density of the adhesive, disturbances, and the like. However, by using the chuck means 5 together, the lens 3 is moved in the horizontal direction. The amount of deviation is as small as possible.

  Similarly, if the shape of the adhesive surface is substantially symmetrical with respect to the horizontal plane passing through the center of the lens 3, the contraction of the adhesive 4 cancels out in the vertical direction, and the movement amount of the lens 3 is zero as a whole. However, since it is necessary to consider the influence of gravity acting on the lens 3 in such a configuration and the lower case, calculation of the offset amount becomes complicated. Therefore, it is preferable that the shape of the bonding surface is substantially bilaterally symmetrical with respect to a plane formed by the vertical line passing through the center of the lens 3 and the optical axis of the lens 3.

  In FIG. 1, the adhesion surface of the lens support portion 2 a has an arc shape having a diameter slightly larger than the outer peripheral circle of the lens, and is formed on the base 2 so as to be concentric with the optical axis of the light emitting element 1. The case is shown. The advantage of this shape is that the thickness of the adhesive layer can be made uniform on the adhesive surface. If the thickness of the adhesive layer is made uniform, uneven coating and curing unevenness of the adhesive 4 can be prevented, and further the adhesive time can be shortened because it is not necessary to increase the thickness of the adhesive layer more than necessary. Can be reduced.

  Further, if the shape of the adhesive surface of the lens support portion 2a is an arc whose central angle is smaller than a semicircle, the direction of contraction of the adhesive 4 is only the lower side of the lens 3, and therefore the lens due to contraction of the adhesive 4 It is possible to reduce the variation in the moving direction 3.

  When an ultraviolet curable adhesive is applied to the adhesive 4, it is necessary to cure the adhesive surface by irradiating it with ultraviolet rays. For this purpose, it is necessary to allow the ultraviolet rays to reach the adhesive surface. Usually, since the lens 3 is transparent, it suffices to irradiate ultraviolet rays from the side where the lens 3 is present. Even in this case, it is preferable that the irradiation direction of the ultraviolet rays is substantially bilaterally symmetrical with respect to a plane formed by the vertical line passing through the center of the lens 3 and the optical axis. If the left and right are not symmetrical, the curing time of the adhesive 4 varies from side to side, so there is a concern about the horizontal displacement of the lens 3 and the occurrence of stress on the bonding surface. For this reason, it is preferable to irradiate ultraviolet rays from directly above the lens 3 as shown in FIG. If ultraviolet rays are irradiated from directly above the lens 3, irradiation can be performed at a right angle to the bonding surface, so that the energy efficiency is the best and bonding in a short time is possible. In the illustrated example, the ultraviolet light is guided using an optical fiber. However, as shown in FIG. 16, if the chuck means 5 is configured so that the lens 3 is free, the optical fiber is not used. Irradiation with ultraviolet rays becomes possible.

Furthermore, in order to shorten the adhesion time by ultraviolet curing, it is preferable to irradiate ultraviolet rays not only from the lens 3 side but also from the lens support portion 2a side. For this purpose, the lens support portion 2a side also needs to have a structure that allows ultraviolet light to pass through. As a structure for allowing the lens support portion 2a to transmit ultraviolet rays, a method of making a hole in the lens support portion 2a or a method of forming the lens support portion 2a with a transparent member can be applied. In either case, since the ultraviolet irradiation efficiency is improved, the bonding time can be shortened.
As shown in FIG. 17, when a hole is made in the lens support portion 2a, the shape of the hole is substantially bilaterally symmetrical with respect to the plane formed by the vertical line passing through the center of the lens 3 and the optical axis of the lens 3s. . By doing so, the balance of the shrinkage condition of the adhesive 4 is maintained in the horizontal direction out of the two directions orthogonal to the optical axis, and therefore the amount of movement of the lens accompanying the shrinkage of the adhesive 4 is as a whole. Near zero.

The light source device manufactured in this way has high accuracy of the relative position between the light emitting element 1 and the lens 3, and also ensures the adhesive strength of the lens.
A so-called multi-beam light source device in which a plurality of combinations of the light emitting element 1 and the lens 3 are provided on one base 2 can be manufactured in the same manner as described above, and the relative positional accuracy of each beam can be ensured precisely. Therefore, the light source device is further useful.

These light source devices can be suitably applied to a recording apparatus. In recent years, recording devices are required to record information with high resolution and high speed. However, the light source device according to the present invention can be suitably applied to a recording device because the accuracy of the beam irradiation position is high. Furthermore, when the multi-beam light source device according to the present invention is applied to a recording apparatus, a wide image can be obtained at high speed.
Specific examples of the recording apparatus include a printing plate making machine, a printing plate block making machine, a printer using a photosensitive drum, a copying machine, and a fax machine.

It is a figure which shows the structure of the manufacturing apparatus of the light source device which implemented this invention suitably. It is a figure which shows the structure of a chuck | zipper means. It is a figure which shows the position adjustment mechanism of 5 degrees of freedom. It is a figure which shows the example of arrangement | positioning of the optical fiber in the case of irradiating an ultraviolet curing adhesive agent with an optical fiber. It is a figure which shows the malfunction which generate | occur | produces by shrinkage | contraction of an adhesive agent. It is a figure which shows the example of a shape of an arm unit. It is a figure which shows a mode that a chuck | zipper means moves with hardening of an adhesive agent. It is a figure which shows the relationship between magnets, distance, and attractive force. It is a figure which shows the structural example of the chuck means provided with the guide surface and the pressure roller. It is a figure which shows the structural example of the chuck means provided with the guide roller and the pressure roller. It is a figure which shows the structural example of the chuck means provided with the guide shaft. It is a figure which shows the lens support part which made the V-shaped part the lens adhere | attached. It is a figure which shows the lens support part which made the part to which a lens adhere | attaches a plane. It is a figure which shows the movement of the lens accompanying shrinkage | contraction of an adhesive agent. It is a figure which shows the layout of the most desirable irradiation direction of an ultraviolet-ray. It is a figure which shows the layout of the chuck | zipper means which can irradiate an ultraviolet-ray suitably. It is a figure which shows the lens support part in which the hole for ultraviolet-ray transmission was formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Base 2a Lens support part 3 Lens 4 Adhesive 5 Chuck means 6 Monitor 7 Nozzle 8 Optical fiber 51 Arm unit 51a, 51b Arm 51c Slot 51d Energizing spring 51f Guide surface 52 Arm unit holding means 52b Magnet 52c Stopper 52d Slide bearing 52e Leaf spring 52g Roller 52h Spring 52j Guide shaft 52k Bearing

Claims (5)

A light source device comprising: a light emitting element; a base on which at least one light emitting element is installed; at least one lens disposed coaxially with an optical axis of the light emitting element; and a lens support portion to which the lens is bonded and fixed. An apparatus for manufacturing
The adhesive that bonds and fixes the lens is a property that shrinks when cured,
Arm unit holding the lens and is composed of the arm unit holding means for movably holding the arm unit only in the vertical direction, the lens is fixed to the lens support disposed vertically below of the lens Chuck means for holding the lens until
A monitor installed such that light from a horizontal optical axis from the light emitting element enters through the lens, and
The arm unit holding means is
Pressurizing means for applying a pressure in a direction away from the lens support to the arm unit;
A stopper that regulates the position so that the arm unit is not further than a predetermined distance from the lens support portion,
The apparatus for manufacturing a light source device according to claim 1, wherein the pressure applied by the pressurizing unit to the arm unit is weaker as a distance between the arm unit and the lens support portion is narrower. The adhesive that bonds and fixes the lens to the lens support is an ultraviolet curable adhesive ,
The light source device manufacturing apparatus according to claim 1, wherein the arm unit is transparent.   The light source device manufacturing apparatus according to claim 2, wherein the ultraviolet curable adhesive is cured by irradiating ultraviolet rays substantially symmetrically with respect to a vertical plane including an optical axis of the lens.   The chuck means adjusts a position in each axial direction of a three-dimensional orthogonal coordinate system with the optical axis direction of the lens as one axial direction and a rotation angle about two coordinate axes that do not coincide with the optical axis direction of the lens. The light source apparatus manufacturing apparatus according to claim 1, wherein the apparatus is possible.   The base is centered on the chuck means with respect to a position in each axial direction of a three-dimensional orthogonal coordinate system in which the optical axis direction of the lens is one axial direction and two coordinate axes that do not coincide with the optical axis direction of the lens. 5. The light source device manufacturing apparatus according to claim 1, wherein the rotation angle is adjustable.

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